Omega Engineering DP3600 User Manual

PROGRAMMABLE  
PROCESS MONITORS  
USER’S MANUAL  
DP3600, DP3700 AND DP3800 SERIES  
OMEGA ENGINEERING, INC.,  
ONE OMEGA DRIVE,  
STAMFORD, CT 06907.  
MANUAL: M881/0399  
SCALING ..............................................................................................................................................................................................................12  
OFFSET .................................................................................................................................................................................................................12  
TARE ......................................................................................................................................................................................................................13  
LIMITS ...................................................................................................................................................................................................................13  
PROCESS LIMITS:............................................................................................................................................................................................... 13  
Displaying:.....................................................................................................................................................................................................13  
Resetting:........................................................................................................................................................................................................13  
TIMER LIMITS:.................................................................................................................................................................................................... 14  
Displaying:.....................................................................................................................................................................................................14  
Resetting:........................................................................................................................................................................................................14  
ALARM OUTPUTS ............................................................................................................................................................................................14  
STATUS:............................................................................................................................................................................................................... 14  
ELECTRO-MECHANICAL RELAY OPTION:...................................................................................................................................................... 14  
Figure 1. Electro-mechanical Relays Hookup Example........................................................................................................................14  
OPEN COLLECTOR OPTION............................................................................................................................................................................... 15  
Figure 2. Open Collector Hookup Example...........................................................................................................................................15  
HOLD FUNCTION.............................................................................................................................................................................................15  
SAVING PARAMETER:..................................................................................................................................................................................15  
POWER ..................................................................................................................................................................................................................15  
FIGURE 3. REAR VIEW OF DP3600 INSTRUMENT ...........................................................................................................................16  
OUTPUT CONNECTOR PIN ASSIGNMENT:.........................................................................................................................................16  
TROUBLE SHOOTING....................................................................................................................................................................................17  
FACTORY DEFAULT SETTINGS FOR VOLTAGE, CURRENT AND MILLIVOLT :................................................................................................ 17  
ERROR MESSAGES: ............................................................................................................................................................................................ 17  
MOUNTING.........................................................................................................................................................................................................18  
2
SPECIFICATIONS  
(typical @ 25 C and rated supply voltage unless otherwise specified).  
STANDARD INPUT:  
* 4 - 20 MA, 10 - 50 MA, 0 - 5 VDC, 0 - 10 VDC  
EXTERNAL HOLD:  
* An external low level signal applied to the HOLD pin on the rear connector will initiate hold function.  
ANALOG TO DIGITAL CONVERSION:  
* 41/2 Digit A/D conversion.  
* Dual slope integrating converter.  
* Conversion Rate: seven conversions per second typical.  
INPUT IMPEDANCE  
* 100 OHMS for 4-20 ma  
40 ohms for 10-50 ma  
* 1 megohm for voltage input  
POWER REQUIREMENTS (choice of three supply ranges):  
* 120 VAC -- 60Hz  
* 240 VAC -- 50Hz  
* 7.5 VDC -- 12VDC @ 900 ma  
DIMENSIONS:  
* Case: 3.60" x 1.75" x 7"  
* Bezel size: 4.40" x 2.25" x 0.45"  
* Extruded Aluminum enclosure  
DISPLAY:  
* Red 7-segment LED display, 0.39 inch (10mm) digit height.  
* Negative Polarity indication.  
* Over range indication: HELP.  
* Display Test: Briefly displays 8888 on power up.  
RELAYS (optional):  
* Single pole double throw, 1 Ampere @ 28VDC or 0.5 amp @ 120VAC, resistive.  
OPEN COLLECTOR:  
* Open collector drive: 5vdc @ 50ma each (maximum of six outputs)  
SCALING:  
* Programmable from 1-30000 units  
OFFSET:  
* Programmable from 0-30000 units  
TARE:  
·
Programmable and is equal to the value of programmed scale.  
3
DESCRIPTION  
The DP3600 series of instruments are micro-processor based intelligent monitors that are capable of  
performing several tasks in addition to displaying the process variable. The micro-processor technology  
used in the system design has provided these instruments a cost and performance edge that is simply not  
possible with analog systems.  
Various process parameters monitored by the system can be displayed by pushing appropriate keys on the  
front panel e.g. LMT1, Peak etc. The respective parameter will be displayed for as long as the key is kept  
pressed. Alternatively, if the key is pressed and then released, the monitor will display the particular  
parameter briefly and then go back to process variable display mode. Each key works either by itself or in  
combination with other keys to perform various functions.  
The system has a warning mode where it displays 'HELP' any time a wrong key or sequence of keys is  
pressed. Also incase of over/under range the 'HELP' sign will be displayed constantly.  
The system has six limit alarms, four for process and two timers. One of the four process limits can be  
figured to work as rate limit (LIMIT 3) while another process limit (LIMIT 4) can be programmed to work s  
deviation limit. All limit alarms can be operated in two different modes. The first one is non latching mode  
in which the relays reset automatically as soon as process, rate or deviation falls below the limit (minus the  
relay dead-band). The second one is latching mode. In this mode the relays will stay energized even after the  
parameter falls below the programmed limit. They can be reset manually only.  
The very first thing required before monitoring the process would be to configure the personality of the unit  
to fit your particular application. This will allow the process variable to be read in a more comprehensible  
manner. Configuration is done by going into the SETUP mode and programming such parameters as  
SCALE, OFFSET, RELAY DEADBAND etc.  
SET UP  
Setup Entry:  
To get into setup mode, press the TIME/SET UP key twice. This will get you into the setup mode and will  
be indicated by displaying of the message ENTR PC’ (for ‘Enter PassCode’). At this point enter the pass  
code for your system. The pass code entry, which is four digits long, keeps unauthorized personnel from  
changing system parameters. Each key is marked with a small digit in one of its corners. Pass-code is a  
combination of these digits and for this system it is 3254. Three attempts at entering the correct pass-code  
are allowed. Any time a wrong digit is entered the display will read 'HELP'. If a person fails to enter correct  
pass-code in three attempts, the system automatically exits SETUP mode. To try again, you have to get into  
the setup mode by pushing ‘SETUP’ key twice.  
Setup Exit:  
To exit SETUP mode at any point, simply push RESET key and hold it till display reads 'SAVING'  
(SAVING indicates that programmed parameters are being saved in Electrically erasable programmable  
read only memory -- EEPROM).  
4
Programming Group Selection:  
On entering correct passcode, setup procedure starts. The very first step will let you select one of the three  
groups of parameters that you can program. Three available groups are: 1) SCALING 2) PROGRAM  
LIMITS 3) PROGRAM SYSTEM. Each group will let you program various parameters as shown below:  
PROGRAM SYSTEM  
PROGRAM LIMITS  
SCALING  
1. Display Options  
2. Flash Time  
3. Engineering units  
4. Program Setpoint  
5. Remote Tare/Hold  
6. Input Type  
1. Process Limit1  
2. Process Limit2  
3. Setup limt 3 for Rate/Process  
4. Process Limit 3  
5. Setup Limit4 for Process/Deviation  
6. Process Limit 4  
7. Timer 1 Limit  
1. High Scale  
2. Low Scale  
3. Offset  
4. Tare  
7. Input Range  
8. Timer 2 Limit  
9. Deadband for limits  
9. Limits Normally open/close (1 Thru 4)  
10. Limits Latching/Non Latching  
11. Audio Alarm On/Off  
Push ^v key to move from one programming group to the next. When a desired group is displayed, push  
SETUP key to select it.  
SCALING  
Decimal point:  
Decimal point mode is indicated as ‘dp 9999’ (dp stands for DECIMAL POINT). Push ^v key to program  
decimal point. Each push on the ^v key moves the decimal point to the next position. After 9.999 the display  
will go to 9999. When proper decimal point position has been obtained push SETUP key to go to the next  
mode.  
High Scale:  
High scale mode is indicated by a brief display of the message ‘HI SCLE’ followed by high scale value.  
The least significant digit (right most digit) will be flashing. The flashing indicates that pushing ^v key will  
increment or decrement that particular digit. Pushing ^v key once and holding it down will increment the  
flashing digit. Releasing the ^v key and pushing it again immediately ( and then holding it in) will start  
decrementing the display. The desired number can be programmed by toggling the ^v key. To move to the  
next significant digit push <NXT> key, and to increment or decrement it, use ^v key. After obtaining a new  
high scale value (or to retain the current one) push SETUP key to get to the next mode.  
Low Scale:  
Low Scale mode is indicated by the display first flashing ‘LO SCLE’ and then the pre-programmed value  
of low scale. Again, to change the flashing digit value use ^v key. To change any other digit, use <NXT>  
key to make that digit flash and then use ^v key to change its value. After obtaining a new value (or to retain  
the present value) push setup key. This will also get you into the next function.  
5
Offset:  
Next configurable function is offset and is indicated by the message ‘OFFSET’ followed by current offset  
value. To change the value of flashing digit press ^v key. To move the flashing digit, push <NXT> key.  
After programming the desired value of offset, push the "SETUP" key to get to the next function.  
Tare:  
Tare mode is indicated by the word 'TARE' followed by current Tare value. To change the value of  
flashing digit, press ^v key. To move the flashing digit, push <NXT> key. After programming the desired  
value of ‘TARE’ push ‘SETUP’ key (Minimum programmable tare is zero, maximum is equal to the scale  
value). This will take us back to the very beginning of SETUP mode with the display showing the message  
‘SCALING’.  
PROGRAM LIMITS:  
Process Limits (1 thru 4):  
If selection made from programming groups is for ‘PROG LT’ then the very first parameter programmed is  
process limit 1. This is indicated by the message ‘PrG LT1’ followed by pre-programmed value of the  
limit. Again, use <NXT> key to move flashing to the next digit and ^v key to increment/decrement the  
value of the flashing digit.  
The following steps are very similar to the above (i.e. for Limits 2,3 and 4 and also if Limits 3 and 4 are  
setup as process limits) and allow you to enter process limits 2 through 4. However, limits 3 and 4 can be  
configured to work as rate and deviation limits, respectively. Therefore, after programming limit 2, the next  
step takes us into selection of limit 3 as rate or process limit.  
Selection of Limit 3 as Process or Rate Limit:  
This step comes after programming Limit 2 and is indicated by the message ‘LT3 RTE’ (if Limit 3 is setup  
as Rate limit) or ‘LT3 Pr’ (if Limit 3 is setup as Process limit). Alternate selection can be made by pushing  
^v key. Push SETUP key after making the selection.  
Programming Limit 3:  
As Process Limit:  
If Limit 3, in the above step, was configured as a Process limit, then the message displayed on entering this  
mode will be ‘PrG Lt3’. This will be followed by displaying of current value of Limit 3 . Use <NXT> key  
to move flashing to the next digit and ^v key to increment/decrement the value of the flashing digit.  
As Rate Limit:  
If Limit 3, in the above step, was configured as a Rate limit, then the message displayed on entering this  
mode will be ‘RATE Lt’. This will be followed by displaying of current value of Limit 3 . Use <NXT>  
key to move flashing to the next digit and ^v key to increment/decrement the value of the flashing digit.  
6
Selection of Limit 4 as Process or Deviation Limit:  
This step comes after programming Limit 3 and is indicated by the message ‘LT3 Pr’ (if Limit 3 is setup as  
Process limit) or ‘LT3 dEN’ (if Limit 3 is setup as deviation limit). Alternate selection can be made by  
pushing ^v key. Push SETUP key after making the selection.  
Programming Limit 4:  
As Process Limit:  
If Limit 4, in the above step, was configured as a Process limit, then the message displayed on entering this  
mode will be ‘PrG Lt4’. This will be followed by displaying of current value of Limit 4 . Use <NXT> key  
to move flashing to the next digit and ^v key to increment/decrement the value of the flashing digit.  
As Deviation Limit:  
If Limit 4, in the above step, was configured as a Deviation limit, then the message displayed on entering  
this mode will be ‘dEVN Lt’. This will be followed by displaying of current value of Limit 4 . Use  
<NXT> key to move flashing to the next digit and ^v key to increment/decrement the flashing digit.  
Timers 1 and 2:  
This mode lets you enter values for timer 1 and 2. The display will read ‘TR1 LT’ (for timer 1 limit) and  
‘TR2 LT’ (for timer 2 limit) followed by current programmed value of each of the timers. To change the  
value use <NXT> key in conjunction with the ^v key. Once done, push the SETUP key to go to the  
following parameter.  
Relay Deadband:  
The parameter programmed after timers is limit deadband. The display will first read " DEAD BD" and  
then show the value of previously programmed dead-band. To change the value of flashing digit, press ^v  
key. To move flashing digit, push <NXT> key. After programming the desired value of "dead-band" push  
‘SETUP’ key to get to the next function.  
Configuring Limits Normally open/Normally Closed:  
Following relay deadband, the alarm outputs are configured as normally closed or normally open. This will  
be indicated as ‘LT1 N.O.’ ( if limit 1 is programmed as normally open) or ‘LT1 N.C.’ (if limit 1 is  
programmed as normally closed). To make an alternate selection, push the ^v key. After selecting or to  
retain current setting, push the SETUP key. The following three steps are similar to the last step and in it  
limits 2 through 4 are setup as normally open or normally closed.  
Relay Latching/non Latching:  
The next function is configuration of relays as latching or non-latching. In non-latching mode the relays will  
reset automatically when the Process variable drops below the programmed limit. In the latching mode once  
the relays are energized they have to be reset manually even though the process variable might have fallen  
below the limit ( latching/non-latching mode is only for process, rate and deviation limits). If the system is  
in latching mode the display will read ‘LATCH’. Alternately, the display will read ‘NON LCH’ (for "non  
latching"). To get the alternate mode push ^v key. To retain present mode push SETUP key.  
7
Audio Alarm On/Off:  
This unit supports an audio alarm which comes on when ever a limit value is exceeded. This alarm can be  
turned On or Off, as desired. The selection is made by pushing ^v key. If the alarm is ON, the display will  
read ‘ALR ON’ (Alarm On). Alternately, it will display ‘ALR OFF’ (for ‘Alarm Off’). Push SETUP key  
after desired setting is displayed. This last push on SETUP key will also take you back to the very  
beginning of setup mode.  
PROGRAM SYSTEM:  
Display option:  
This is the very first step in programming the system and in this step, display option is selected. One of the  
following options can be selected:  
1) Display process variable  
2) Display set-point deviation  
3) Display rate  
(PROCESS)  
(SP DEN)  
(RATE)  
5) Display High Peak  
6) Display Low Peak  
7) Elapsed time indication  
8) Scan all parameters  
(HIGH PT)  
(LO PT)  
(ELPSD T)  
4) Display process change  
(PR CNG)  
(SCAN)  
To make a selection push ^v key. The display will indicate the selected option as indicated in parenthesis  
against each option. Once the desired display mode has been selected, push the SETUP key.  
Flash Time:  
Flash time is the time inbetween the message which indicates the active display parameter and its value e.g.  
if the selected display option in the above step was ‘PROCESS’, then the display will periodically display  
the message ‘PROCESS’ to indicate that the displayed value is process variable. Flash time is in seconds.  
Thus if the programmed flash time is 20, then process value will be displayed for 20 seconds before the  
message ‘PROCESS’ will be displayed. Use ^v and <NXT> keys to get the desired time. On finishing,  
push SETUP key.  
Engineering Units:  
This step lets you program three alphabet long engineering units e.g. PSI, YDS, FT etc. On entering this  
mode, the active alphabet will be flashing. To change it, push ^v key and keep it pushed till the desired  
alphabet shows up. Toggle the ^v key to go up or down in the alphabets. Use <NXT> key to move to the  
other alphabets and then use ^v key to change them. Programmable alphabets are:  
A,B,C,D,E,F,G,H, I,J,L,N,O,P,Q,R,S,T,U,Y  
After obtaining the desired units, push SETUP key and this will take you to setting up the next parameter.  
Setpoint:  
Setpoint entry mode is indicated by the message 'SETPT' followed by the display of current setpoint value  
e.g. 20.00. To enter new setpoint use <NXT> key in conjunction with ^v key. Once done entering new  
value, or to retain the previous value, push the SETUP key.  
8
Rate Time-Base:  
This step is for programming time-base for calculation of Rate. Units of time-base are seconds. Again, the  
active digit will be flashing. To change the value, push ^v key. To activate another digit for change, use  
<NXT> key. On finishing, push SETUP key.  
Remote Tare/Hold:  
Remote Tare/Hold feature lets you select between the remote switch being used for resetting tare or holding  
the reading on the display. The display will read 'RT TARE' (for remote Tare) or 'RT HOLD' ( for remote  
display hold feature ). To get the alternate mode push ^v key. Else push SETUP key and this will get you  
into the next function.  
Input Type:  
The step after remote Tare/Hold is selecting the input type. The display will first read ‘IP TYPE’ followed  
by the current selection. Various input types are:  
i) CURRENT  
ii) VOLTAGE  
iii) LO VOLT  
4-20MA Signal  
0-10Vdc, 0-5Vdc etc.  
0-100mv etc.  
To make a selection push ^v key. After selection push SETUP key to go to the next step.  
Input Range:  
The following step is the last step in this process. This is where you program the input range of your signal.  
On entering this mode, the display will first read " IP RNGE" (for input range) followed by the indication  
of current input range. Following RANGE values should be entered for various inputs:  
INPUT TYPE  
INPUT RANGE  
PROGRAMMED VALUE  
VOLTAGE  
VOLTAGE  
CURRENT  
LO VOLT  
0-10VDC Signal  
0-5VDC Signal  
4-20ma Loop Current  
0-100 Millivolt Signal  
10.000  
5.000  
20.00  
100.0  
If the end user recalibrates any of the process inputs to different values he/she must enter new values here.  
NOTE: THE INPUT TYPE IS SET ACCORDING TO THE MODEL ORDERED. SIMPLY MAKING A  
SELECTION WILL NOT CONVERT THE UNIT FROM A CURRENT TO A VOLTAGE OR A  
MILLIVOLT UNIT. THIS IS A HARDWARE CHANGE AND MUST BE SELECTED AT THE TIME  
OF PLACING THE ORDER.  
After entering the desired input range, push the SETUP key. This will take us back to the very beginning of  
setup mode with the display reading SETUP briefly and then SCALING. To exit at this point push and hold  
RESET key till the display shows ‘SAVING’.  
9
SET UP FLOW CHART:  
SETUP  
SCALING  
PROGRAM LIMITS  
PROGRAM SYSTEM  
(SCALING)  
(PROG Lt)  
(PrG SYS)  
DISPLAY OPTION  
(dSP Opt)  
HIGH SCALE  
(HI SCLE)  
PROGRAM PROCESS LIMIT 1  
(PrG Lt1 -- 01.234)  
1. PrOCESS  
2. SP dEn  
3. RAtE  
LOW SCALE  
(LO SCLE)  
PROGRAM PROCESS LIMIT 2  
(PrG Lt2 -- 01.234)  
4. Pr CnG  
5. HIGH Pt  
6. LO Pt  
LIMIT 3 RATE OR PROCESS  
(Lt3 rtE) or (Lt3 Pr)  
OFFSET  
(OFFSET)  
7. ELPSd t  
8. SCAn  
PROGRAM LIMIT 3 VALUE  
(PrG Lt3 -- 02.123)  
TARE  
(TARE)  
LIMIT4 PROCESS / DEVIATION  
FLASH TIME  
(Lt3 dEN) or (Lt3 Pr)  
(FLASH t -- 00015)  
PROGRAM LIMIT 4 VALUE  
ENGINEERING UNITS  
(PrG Lt4 -- 01.123)  
(EG UNIT -- PSI)  
PROGRAM SETPOINT  
TIMER 1 LIMIT  
(SetPt -- 1.234)  
(tr 1 Lt -- 00012)  
REMOTE TARE/HOLD  
(rt tArE -- rt HOLD)  
TIMER 2 LIMIT  
LT3 NORMALLY OPEN/CLOSE  
(tr 2 Lt -- 00012)  
(Lt3 n.O. or Lt3 n.C.)  
INPUT TYPE  
(IP tYPE)  
1. CurrEnt  
DEAD-BAND FOR LIMITS  
(dEAdbd -- db 00012)  
LT4 NORMALLY OPEN/CLOSE  
(Lt4 n.O. or Lt4 n.C.)  
2. VOLtAGE  
3. LO VOLT  
LT1 NORMALLY OPEN/CLOSE  
(Lt1 n.O. or Lt1 n.C.)  
LATCH OR NON-LATCH MODE  
(LATCH -- nOn LCH)  
INPUT RANGE  
(IP rnGE – 020.00)  
AUDIO ALARM ON/OFF  
LT2 NORMALLY OPEN/CLOSE  
(ALr On -- Alr OFF)  
(Lt2 n.O. or Lt2 n.C.)  
10  
MAX. AND MIN. READINGS (PEAKS)  
Displaying:  
To display the peak values of Process variable push Peak key once and let go. The display will first indicate  
HIGH Pt’ briefly and then the value of the highest Process variable value monitored by the system. A  
second push while high peak is being displayed will bring up low peak value on the display. The value will  
be preceeded by the message ‘LO PT’..  
Resetting:  
To reset the peaks to the present value of Process Variable simply push the PEAK key once and keep it  
pushed. The display will briefly indicate ‘HIGH Pt’ and then the value of the high peak. With the PEAK  
key still pushed, go on to press the RESET key. On resetting the display will indicate the new value of high  
peak. To reset the low peak value, get the system in low peak display mode. This is done by pushing the  
PEAK key twice. Do not release the PEAK key after the second push. While keeping the PEAK key pushed,  
press the RESET key. This will reset the low peak to current Process Variable value.  
RATE  
The DP3600 unit keeps track of the rate of process change and can be displayed by pushing the key labeled  
‘RATE’. The display first reads 'RATE' followed by the rate value that was monitored over the last time  
base. The maximum rate of change displayable is equal to the value of High Scale. If the calculated rate is  
negative, it will be indicated so by a negative sign. Rate time base, which is in seconds, is programmable  
and is set during SETUP of the unit.  
TIME  
Displaying:  
The system keeps track of the process run time in hours, minutes and seconds. The display format is  
HH.MM.SS (HH = Hours, MM = Minutes, SS = Seconds). To display the elapsed time since the system  
was turned on or last reset, push the TIME key. The display will first read 'ELPSd t' (for ELAPSED  
TIME) and then the value of elapsed time.  
Resetting:  
To reset the timing and start it all over again, first push the TIME key and while keeping it pushed press the  
‘RESET’ key. The time will reset and the display will read ‘RESET’ following which the unit will start  
tracking time from zero.  
NOTE: On resetting, the time relays, if energized, will de-energize and would be activated again when the  
programmed amount of time has elapsed.  
11  
PROCESS CHANGE  
Displaying:  
The system will constantly monitor the total amount of change in process variable since start or last reset.  
This change is displayable in engineering units by pushing the ‘PR CNG’ key.  
This function is useful in tracking the change that has taken place in the process e.g. in a tank containing  
300 gallons of water, an addition of 200 gallons will show that the total amount of water is 500 gallons. On  
pushing the ‘PR CNG’ key the display will indicate 200 gallons as the total change. Now assume that 400  
gallons of water is pumped out. The total amount of water left in the tank would now be indicated as 100  
gallons. The change that has taken place in the total volume of water from its original 300 gallons can be  
displayed by pushing the "PR CNG" key and it would be 200 gallons.  
Resetting:  
To start tracking the change from a new point, the Process change being indicated can be reset to zero . To  
do so, push the ‘PR CNG’ key twice and keep it pushed. The display will flash the present change value  
three times and then reset it to zero (keep the "PR CNG" key pushed till the display shows zero or close to  
zero). This flashing feature is provided so that if ‘PR CNG’ key gets pushed twice accidently while trying  
to display the process change it would provide a chance to get out of reset mode without actually resetting  
the reading. Therefore, if ‘PR CNG’ key is released any time before the three flashes, the current reading  
of "Process Change" will be retained.  
SCALING  
Scaling is useful in reading the sensor output directly in engineering units e.g. a load cell putting out 4 - 20  
ma signal can be scaled to read 0 - 4000 pounds of load.  
Scale is entered as two different values i.e. High Scale and low Scale. High scale corresponds to the  
maximum output of the transducer and low scale to low output. e.g. For a 0-5V transducer if it is desired to  
read 200 units at 0VDC and 3000 units at 5VDC output then set low scale equal to 200 and high scale to  
3000. The DP3600 unit will linearly scale the transducer output. For a transducer with 4-20ma the low scale  
reading can be obtained at the programmed offset value. For instance if offset is set to 4.00, then the low  
scale reading will be obtained when the unit sees a 4.00ma signal from the transducer.  
Scaling is obtained during setup mode and immediately follows the setting up of decimal point. Maximum  
programmable high scale is from 1-30000 and low scale from 0-high scale value.  
Scaling can be programmed and displayed in SETUP mode only (look under setup).  
OFFSET  
The system provides the capability of programmable offset. This is useful if a certain amount of input from  
the transducer is required to read zero e.g. for a 4-20ma input , 4ma can be made to read zero.  
Offset can be programmed and displayed in the SETUP mode only (look under setup).  
12  
TARE  
Tare function is used for taking out a preset amount of process variable from the total reading e.g. if we are  
measuring weight of a certain product being put in a container but do not want the weight of the container to  
show on the display, then enter the weight of the container as tare value. The DP3600 unit will then  
automatically subtract the weight of the container from the total reading and display the weight of the  
product only.  
Desired Tare is entered during SETUP procedure. Also, while entering Tare in SETUP, pushing the  
‘TARE’ key will take the reading at that instant and store it as a new tare value.  
DP3600 units also allow remote resetting of the TARE by using an external switch. This switch is connected  
between pins 13 and 14 on the rear connector. When ever the remote switch is activated, DP3600 will take  
the reading at that instant and store it as a tare value. As long as the switch is kept activated the unit will  
keep taking the reading as a new tare value.  
For the remote switch to accept the reading as tare, the unit must be setup as such. This is done during the  
setup mode. Alternatively the same switch can be used to hold the display. Therefore, make sure that during  
setup when configuring tare/hold, the display must read 'RT TARE'.  
LIMITS  
Process Limits:  
Displaying:  
The LIMITS key is used for displaying Process Variable limits. Pushing the LIMITS key twice will briefly  
display PR LT1 (first push displays RATE) and then go on to show the process based limit 1 value. Each  
consecutive push there after will display ‘PR LT2’ and programmed limit 2 value, ‘PR LT3’ and its value,  
‘PR LT4’ and its value. If limits 3 and 4 are configured as rate and deviation limits respectively, then the  
third push will display rATE Lt’ followed by rate value and the fourth push will display ‘dEVn Lt’  
followed by deviation limit value. The programming of process limits is done during setup procedure (look  
under SETUP).  
Resetting:  
Once energized, alarms can be reset in two different ways --- automatically or manually (non latching or  
latching). In non latching mode the alarm outputs will de-energize on their own when the process variable  
drops below the limit value. In the latching mode they stay energized even if the process variable drops  
below the limit. To reset the energized outputs in latching mode, first make the display indicate the limit that  
needs to be reset e.g. ‘PR LT2’, by pushing the ‘LIMITS’ key (as described above under ‘Displaying’).  
Next, while keeping the ‘LIMITS’ key pushed, go on to push the ‘RESET’ key. The respective alarm  
output will de-energize and the system will indicate so by displaying RLY RST. Selection of latching or  
non-latching mode for outputs is done during setup.  
13  
Timer Limits:  
Displaying:  
To display timer limits, first push the TIME key. While still in this mode go on to push LIMITS key. The  
display will briefly show TR1 LT (for timer 1 Limit) and then the previously programmed value. Pushing  
the LIMITS key one more time will display TR2 LT followed by pre-programmed timer 2 value.  
Programming of timer limit values is done during setup procedure (for details look under SETUP). Timer  
values are can also be displayed without pushing ‘TIME’ key. TR1 LT and TR2 LT is displayed  
following Process limit 4 (or deviation limit) value, as described above under Process Limits.  
Resetting:  
The two timer outputs will reset as soon as the time is reset to zero. Time is reset to zero by pushing TIME  
and RESET keys simultaneously.  
ALARM OUTPUTS  
Status:  
The system has optional process and timer alarm outputs that are activated when the limit is achieved on  
each one of them. The alarms can be programmed as normally open or normally closed (see SETUP). The  
status of these is indicated on the front panel by the LEDs. When ever an alarm is activated the respective  
LED is turned on.  
Electro-Mechanical Relay Option:  
DP3600 units can be ordered with either open collector outputs or electro-mechanical relays. (Check model  
number printed on the unit for option). If ordered with relays, then these relays are programmed during  
Setup to operate as either Normally Open (NO) or Normally Closed (NC). The default setting is Normally  
Open. Each of these limit relays provides a switched output whenever a limit is reached. The maximum  
rating for a 120Vac unit is 120Vac @ 0.5 amp or 28 Vdc @ 1.0 amp.  
Figure 1. Electro-mechanical Relays Hookup Example  
OUTPUT CONNECTOR  
Instrument  
8
Switched Output  
7
5
3
1
LIMIT # 4  
LIMIT # 3  
120 VAC @ 0.5 AMPS  
120 VAC @ 0.5 AMPS  
120 VAC @ 0.5 AMPS  
120 VAC @ 0.5 AMPS  
6
4
2
Switched Output  
Switched Output  
Switched Output  
LIMIT # 2  
LIMIT # 1  
LIMIT RELAYS  
14  
Open Collector Option  
Whenever a limit is reached an open collector output provides a 5 Vdc signal at 50ma. on the output  
connector, e.g... Limit 1 provides its 5 volt output signal between pins 1 and 2.  
Figure 2. Open Collector Hookup Example  
+OUTPUT  
Instrument  
1
LOAD  
-OUTPUT  
2
Solid State Relay,  
LED, Buzzer etc.  
HOLD FUNCTION  
The hold function allows to freeze the Process Variable reading in the display window indefinitely till the  
Hold pin is active. This function is activated by tying Hold pin (pin13) to the digital ground pin (pin 14)  
through a relay or switch.  
SAVING PARAMETER:  
DP3600 saves all the programmed parameters in an EEPROM (electrically erasable programmable read  
only memory). An EEPROM stores the programmed parameters even when the power is removed from the  
unit. However, it is important to note that if the parameters are being changed during setup, they must be  
saved in the EEPROM by pressing and holding RESET key till the display reads ‘SAVING’. If the  
parameters are NOT saved and the power is removed from the unit, any newly changed values will be lost  
(the unit will maintain the old values).  
POWER  
Power connection should be made to the three terminal connector as shown in figure 3. Also, make note  
that it is very important that the power line inputs and the power ground are not switched. Doing so will  
permanently damage the instrument. Refer to the drawing for proper connections. For convenience, the  
printed circuit board is labeled L1 L2 GND on the under side of three terminal power connector.  
For instruments with the 12Vdc power option, refer to Figure 3.  
NOTE: WHILE MAKING POWER CONNECTION TO THE UNIT, MAKE SURE THAT AC  
POWER LINE L1 OR L2 IS NOT ACCIDENTALLY CONNECTED INTO THE GROUND  
(GND) TERMINAL. THIS WILL RESULT IN PERMANENT DAMAGE TO THE  
INSTRUMENT.  
DOUBLE CHECK THE CONNECTIONS BEFORE APPLYING POWER!!  
15  
FIGURE 3. REAR VIEW OF DP3600 INSTRUMENT  
OFFSET  
ADJUST  
(For MV input)  
OUTPUT CONNECTOR  
10 9  
POWER  
_
GAIN  
ADJUST  
G
N
+
13 12  
8
7
14  
11  
6
5
4
3
2
1
L1 L2  
D
Positive  
Signal  
Negative  
Signal  
POSITIVE  
SUPPLY  
NEGATIVE  
SUPPLY  
(FOR DC POWER SUPPLY OPTION)  
OUTPUT CONNECTOR PIN ASSIGNMENT:  
SCREW TERMINAL OUTPUT CONNECTOR  
14 13 12 11  
9
8
6
3
10  
7
5
4
2
1
TOP OF  
THE  
UNIT  
PIN NO  
DESCRIPTION  
LIMIT 1 COMMON/OPEN COLLECTOR POSITIVE  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
LIMIT 1 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
LIMIT 2 COMMON/OPEN COLLECTOR POSITIVE  
LIMIT 2 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
LIMIT 3 COMMON/OPEN COLLECTOR POSITIVE  
LIMIT 3 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
LIMIT 4 COMMON/OPEN COLLECTOR POSITIVE  
LIMIT 4 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
TIMER 1 COMMON/OPEN COLLECTOR POSITIVE  
TIMER 1 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
TIMER 2 COMMON/OPEN COLLECTOR POSITIVE  
TIMER 2 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE  
GROUND RETURN FOR HOLD/TARE PIN 1  
HOLD/TARE PIN 2  
16  
TROUBLE SHOOTING  
If the meter locks on a particular display, unplug and plug in again the meter to unlock the display.  
A total reset defaults all scaling values to zero. To perform this reset, re-apply power with RESET key  
pressed in.  
Factory preset values for Current, Voltage and millivolt, respectively, can be programmed by simply re-  
apply power with either ^v, RATE or TARE key pressed in. Respective default values are for  
CURRENT, VOLTAGE and MILLIVOLT inputs are:  
Factory default settings for voltage, current and millivolt:  
CURRENT  
INPUT  
VOLTAGE  
INPUT  
MILLIVOLT  
INPUT  
PARAMETER  
HIGH SCALE  
LOW SCALE  
OFFSET  
20.000  
0.000  
0.00  
10.000  
0.000  
0.00  
100.00  
0.000  
0.00  
TARE  
LIMITS  
0.000  
1.000  
0.000  
1.000  
0.000  
1.000  
Error Messages:  
Various error messages indicated on the display are interpreted as below:  
ERROR MESSAGES AND SOLUTIONS  
ERROR MESSAGE  
'EE EROR'  
ERROR CONDITION  
SOLUTION  
The unit was unable to  
save programmed value  
in EEPROM -- possible  
failure of EEPROM.  
If the message keeps coming up,  
unplug the unit and reapply power.  
If the unit still displays the error  
message, send it in for repair.  
If the error message followed by  
8.8.8.8.8.8. and the revision  
number are displayed occasionally,  
it is an indication that the power  
line is very noisy and needs a  
power line filter.  
'PIO ERR'  
Analog to digital conv-  
erter error or keyboard  
processing error.  
See above  
17  
3.62" (91.9mm)  
MOUNTING  
1.70"  
43.2mm  
1. Cut a hole in panel to the specifications  
shown in the figure 4:  
NOT DRAWN TO SCALE  
1
Figure 4. Panel Cutout Dimensions  
A
3
2
2. Insert pannel meter into the hole until it is flush with  
the pannel.  
3. Refer to Figure 5. Losen the wing nuts (3) on the two  
screws (2) on the bracket. You don't have to remove the  
screws.  
4. Slide the open end (A) of the bracket onto the meter  
until it is flush with the panel. The rear of the meter  
should touch the back of the bracket (B).  
4
B
3
Figure - 5. Mounting Bracket Assembly  
5. Tighten the wing nuts. Check  
that the meter is secure against the  
panel. If not, use a screwdriver and  
slip it into the slot between the  
bracket and the meter (refer to  
Figure 6 below to locate the spot  
where the screwdriver should go)  
and push the meter back with the  
screwdriver to reduce the gap  
between the meter and the panel.  
This will insure a tight fit for the  
panel meter.  
Bracket  
Back of  
the Meter  
Figure - 6. Screwdriver Placement  
-- Side view of mounting bracket  
Screw Driver  
Push Meter this way  
with the Screwdriver  
18  

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