Lincoln International Welder K2259 1 User Manual

IM775-A  
MK 091-0612  
WIRE FEEDER  
October 2007  
RETURN TO MAIN MENU  
OPERATOR’S MANUAL  
®
Cobramatic  
K2259-1  
For use with code 11480  
Safety Depends on You  
Lincoln arc welding equipment is  
designed and built with safety  
in mind. However, your overall  
safety can be increased by proper  
installation...and thoughtful oper-  
ation on your part.  
DO NOT INSTALL, OPERATE  
OR REPAIR THIS EQUIPMENT  
WITHOUT READING THIS  
MANUAL AND THE SAFETY  
PRECAUTIONS CONTAINED  
THROUGHOUT. And, most  
importantly, think before you act  
and be careful.  
Copyright © 2007 Lincoln Global Inc.  
®
ꢀꢁꢂꢃꢄꢀꢂ  
ꢅꢀꢅꢃꢆ ꢁꢃ  
World’s Leader in Welding and Cutting Products  
Sales and Service through Subsidiaries and Distributors Worldwide  
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table of Contents  
Safety Guidelines .................................................................................................i-vi  
Installation ................................................................................................. Section A  
Technical Specifications............................................................................................................... 1  
Machine Grounding...................................................................................................................... 1  
Mounting Location........................................................................................................................ 1  
Input Power Connections............................................................................................................. 1  
Wire Threading Procedure........................................................................................................... 1  
Welding Gun Connections ........................................................................................................... 3  
Operations.................................................................................................Section B  
General Description ..................................................................................................................... 3  
Recommended Processes and Equipment.................................................................................. 4  
Controls and Settings................................................................................................................... 4  
PosaStart® Operating Procedure ................................................................................................. 6  
Remote Operation........................................................................................................................ 7  
Accessories...............................................................................................Section C  
Optional Kits................................................................................................................................. 7  
Maintenance..............................................................................................Section D  
Routine Maintenance ................................................................................................................... 7  
Testing the Feeder ....................................................................................................................... 8  
Testing the Gun............................................................................................................................ 8  
Troubleshooting.........................................................................................Section E  
Troubleshooting Guide................................................................................................................. 9  
Diagrams/Parts List ..................................................................................Section F  
Diagrams Table of Contents........................................................................................................11  
Main P.C. Board Connections .................................................................................................... 13  
Cabinet and Gun Hook-Up......................................................................................................... 14  
Mechanical................................................................................................................................. 15  
Electrical..................................................................................................................................... 23  
Safety Warnings  
Warranty  
Cobramatic® Owner’s Manual  
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Declaration of Conformity for  
European Community (CE) Products  
Note  
This information is provided for units with CE certification (see rating label on unit).  
Manufacturer’s Name:  
MK Products, Inc.  
16882 Armstrong Ave.  
Irvine, CA 92606  
Declares that the product:  
conforms to the following Directives and Standards:  
Cobramatic®  
Directives  
Low Voltage Directive: 73/23/EEC  
Electromagnetic Compatibility (EMC) Directive: 89/336/EEC  
Standards  
Arc Welding Equipment Part I: Welding Power Sources: IEC 60974-1  
(September 1998 - Second Edition)  
Arc Welding Equipment: Wirefeed Systems: IEC 974-5  
(September 1997 - Draft Revision)  
Degrees of Protection Provided by Enclosures (IP Code): IEC 529:1989  
(November 1989 - First Edition)  
Insulation Coordination For Equipment With Low-Voltage Systems:  
Part I: Principles, Requirements and Tests: IEC 664-1: 1992  
(October 1992 - First Edition)  
Electromagnetic Compatibility, (EMC): EN 50199  
(August 1995)  
Torches And Guns For Arc Welding, EN 50078  
Cobramatic® Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Cobramatic® Safety - page i  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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ꢙꢃ2 ?5  
Cobramatic® Safety - page ii  
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ꢗꢅꢅꢏ ,ꢂꢏꢅꢈ- Fꢍꢌ ꢏ% ꢋꢓ ꢄꢅ ,3ꢐꢍꢏꢈꢅꢈ  
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*ꢅꢅ ꢂꢈꢈꢄꢄ ꢂꢗꢍꢑꢅ+  
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  ꢍꢋꢅꢏ   ꢐꢒꢈꢅꢌ ꢑꢂꢅꢁ  
#ꢎꢁ <  ꢐꢂꢋꢄ  ꢍꢓ ꢒꢄ ꢗꢅ  ꢐꢅ ꢂꢏꢈ ꢂꢏꢈ  
ꢊꢆꢖ  'ꢐꢅꢋꢊ  ꢅꢏ   ꢐꢒꢈꢅꢌ  ꢆꢏ ꢄꢅ ꢍꢌ ꢐꢍꢏꢏꢅꢐ   
ꢓꢄꢅꢁ  
# 3ꢂꢈ ꢂꢏꢈ    ꢏꢄ ꢍꢏ ꢐꢍꢄꢄꢅꢈ ꢖꢂꢄ  
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ꢎꢌ  ꢖꢂ ꢓꢐ ꢂꢄ ꢂꢊ ꢅꢌ ꢑꢅꢄ% ꢅꢂꢑꢒ  ꢊ%  
ꢐꢓꢎꢇꢄꢄ ꢓꢄꢅ%   ꢅꢄ ꢂꢏꢈ  ꢐꢂꢋ ꢍꢑꢅꢌ ꢒꢍꢓꢌ  /ꢂꢌ  
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Cobramatic® Safety - page iii  
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Cobramatic® Safety - page iv  
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Cobramatic® Safety - page v  
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83ꢀ ꢈꢓꢐ:ꢐꢍ9ꢌꢆ/ꢍꢓ  
ꢕꢅꢋꢅ :ꢐꢍ9ꢌꢆ;ꢂꢏꢒꢈꢓꢐꢊ  
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ꢝꢊ ꢝꢊꢆ:ꢐꢍ9ꢌꢆꢝꢆꢍꢄꢊꢆꢓꢂꢓꢐ ꢈꢑ%ꢏꢈꢄꢄꢓꢇꢆꢇꢆꢊ% ꢄꢋꢅꢐꢝꢊꢓꢐ   
ꢈꢑ/'ꢋꢄꢄꢏꢒꢏꢒ%ꢏꢒꢆꢊꢅꢄꢄꢏꢒꢓꢄ=ꢊꢆꢍꢄꢅ%  
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 ꢝꢌꢄꢋꢅꢐꢝꢊ ꢈꢓꢐ  
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%ꢏꢈ ꢄꢋꢍꢏꢄꢇꢆꢊ ꢓꢄ0ꢏꢒꢅꢒꢍꢏꢈ ꢍꢏ:ꢐꢍ9ꢌꢆ ꢄꢓꢅꢈꢆꢏ  
ꢂꢋꢋ ꢄꢅꢋꢅꢄꢝꢎ ꢍꢈꢄꢏꢈ7ꢓ  
4ꢝꢊ; ꢏꢖꢅK) ꢐꢐꢓ ꢅꢄꢏꢍꢈꢖꢅꢝꢊ ꢊꢆ$ꢂꢄꢅꢝꢊ  
ꢇꢆꢐꢍꢌꢆꢍꢔ  
ꢏꢒꢋꢈꢂꢏꢁ  
7  6    ꢆꢕ ꢋ+ꢈ"ꢆꢖ 2ꢗꢉ .  %ꢙ ꢕꢓ !  
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ꢂꢀ34  
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Cobramatic® Safety - page vi  
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Section A  
Installation  
Technical Specifications  
Wire Diameter Capacity ............................. .030” - .045” Solid and Hard wire  
.......................................................................030” - 1/16” Aluminum  
Wire Capacity ...................................................... 12” Standard  
(Insulated or Non-Insulated)  
Power Input ......................................................... 42 VAC 50/60 Hz,  
............................................................................... 150 Watts Peak (3 amps)  
Weight .................................................................. 42 pounds  
Shipping Weight ................................................. 47 pounds  
Support Equipment Required  
C.V. or C.C. Power Source of Sufficient Capacity for Your Needs.  
Regulated Gas Supply and Hoses.  
Properly Sized Power Leads from Power Source to Wire Feeder and Ground.  
Coolant Recommendations (for Water Cooled Guns)  
Water Source and Hose Capable of Providing a Minimum of 1 qt/min. at 45  
p.s.i. when using water cooled guns.  
MK Recommended Coolant Solution:  
1 part ethylene glycol  
3 parts distilled water  
1 teaspoon liquid glycerin  
Check coolant periodically to remain within limits of the following:  
A. Coolant Flow rate - 1 quart/minute at 45 p.s.i.  
B. Resistivity - 10K ohms/centimeter  
C. Ph Range - 5.5-8.5  
D. Particle Size - .005”  
Machine Grounding  
The Cobramatic® and GMAW wire feeders are grounded to the power source  
through the input cable. The power source grounding terminal must be prop-  
erly connected to electrical ground per the power source operating manual.  
Mounting Location  
The cabinet should be placed in a location where it can be protected from  
damage. Lead lengths and accessibility must also be considered when  
installing the cabinet.  
Input Power Connections  
Your Wire Feeder comes factory ready with a harness to plug directly into all  
14 pin Lincoln Power Sources equipped with 42 VAC auxiliary.  
The 42 VAC is connected to the PC Board on terminal strip J5 #1 (neutral-  
white) and #2 (hot-black) and Ground (green) to the Cabinet chassis. See  
diagram in the appendix.  
Wire Threading Procedure  
Wire Spool Installation  
Release latches, and open right side door of cabinet.  
Remove spool retainer nut from spindle hub.  
Cobramatic® Owner’s Manual - page 1  
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Raise wire retainer bar to latched position.  
Install wire spool onto spindle hub so that wire feeds from bottom of spool  
towards slave motor. Make sure that the hole in the wire spool aligns with  
pin on spindle hub. The white dot on the end of the spindle hub will aid in  
this alignment.  
Replace the spool retainer nut.  
Lower the wire retainer bar onto the spool.  
Wire Spool Drag Setting  
NOTE:  
Standard factory setting of the Spindle Tension Knob is set for All  
Other Wires.  
There are two visible position settings for this Knob, IN - All Other Wires  
(Fig. 1) and, OUT - .030”/.035” Al Only (Fig. 2). The Spindle Tension Knob  
must be set to match the Wire Size Selector Switch on the Cobramatic® front  
panel.  
To change this setting, it is easier done without the spool of wire on the spin-  
dle. Remove the wire spool retainer nut and re-install it reversed back onto  
the Spindle Tension Knob (Fig. 3). In the “Tool Mode”, the square shaped  
end of the retainer fits onto the Knob. Grab the retainer nut and turn in the  
COUNTER-CLOCKWISE direction until it stops. The Knob is now set to the  
OUT position (.030”/.035” AL Only).  
Wire Spool Retainer In "Tool Mode";  
used to change spindle drag.  
Figure 3  
IN - All other wires  
OUT - .030/.035 Aluminum ONLY  
Figure 1  
Figure 2  
To reset the Knob back to the factory setting of All Other Wires, use the  
retainer nut as described above, and turn in the CLOCKWISE direction until  
it stops. The Spindle Knob is now set to the IN position. Turning the retainer  
nut and Spindle Knob in this direction may require more effort, since turning  
CLOCKWISE is working against a spring.  
Load wire spool onto spindle according to the previous instructions.  
Replace the spool retainer nut.  
Lower the wire retainer bar onto the spool.  
Wire Threading Procedure  
Place wire size selector switch on front panel to the correct position for the  
wire being used.  
Loosen end of wire from spool and cut off any kinked or bent portions.  
Unreel and straighten out first 6” to 8” of wire.  
Raise wire type lever on the slave motor assembly of gun to center position.  
Route wire into inlet guide, along drive roll groove, and into wire conduit.  
Flip wire type lever to display name of wire type being used.  
When using a Cobra® Gold or Prince® XL gun tighten the gun pressure  
adjusting knob so the wire will be picked up and fed through the contact tip.  
Proper tension is achieved when wire does not slip if a small amount of pres-  
Cobramatic® Owner’s Manual - page 2  
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sure is added to the wire as it exits the tip.  
Wire Retainer Bar  
The design of the patented Cobramatic® Wire Retainer Bar performs two very  
important and very basic functions of the wire feeder: a) spool drag tension,  
and b) wire maintenance on the spool.  
The spool drag tension is set by lowering the wire retainer bar onto the sur-  
face of the wire inside of the spool. The spring tension of the wire retainer  
bar applies enough pressure on the spool so that when the gun trigger is  
released, engaging the brake pall, the spool does not overrun kicking wire off  
the spool.  
Wire maintenance on the spool is performed by the applied pressure of the  
wire retainer bar spread across the coiled wire on the spool. The replace-  
able pad (P/N 437-0255) of the wire retainer bar is designed to hold the wire  
on the spool, maintaining the smooth layering of the wire and keeping it from  
jumping off, and possibly, electrically shorting to the cabinet chassis.  
Welding Gun Connections  
Control Cable  
The 7-Pin “W” Clocked connector screws onto the mating receptacle on the  
front panel of the wire feeder. This provides all electrical signals (motor volt-  
age, potentiometer control & trigger) to and from the feeder to the gun.  
Water Inlet (For Water Cooled Guns)  
Front panel access to connect the water hose to the middle fitting on the  
power block.  
Wire Conduit Inlet  
Front panel access to attach conduit to front of slave motor assembly.  
Power Cable Inlet  
Front panel access to attach power cable (air or water) to top of power block.  
Guns with ring lugs, MUST connect to top bolt of power block.  
Gas Inlet  
Front panel access to attach gas hose to bottom fitting of power block.  
Work Cable (Ground)  
Connect a work lead of sufficient size and length between the proper output  
stud on the power source and the work. Be sure the connection to the work  
makes tight metal to metal electrical contact. Improper work lead connec-  
tions can result in poor arc initiation and unsatisfactory weld results.  
Consult welding power supply manufacturer for proper work lead sizing.  
Section B  
Operation  
General  
The AC slave motor in the feeder runs at a fast, constant speed, but has very  
low torque. It is always trying to feed more wire than the gun motor wants,  
and when the gun motor gets all the wire it wants, the slave motor automati-  
cally slows, preventing a bird’s nest. Because of the low torque produced  
by the slave motor, a combination drag and electric brake system is used to  
prevent wire overrun rather than relying on spindle tension alone. The spool  
drag tension is produced by the patented Wire Retainer Bar mechanism to  
keep the wire slightly taut. The 24 VDC gun “pull” motor is controlled by a  
solid state speed control in the cabinet and through a potentiometer located  
in the gun.  
Cobramatic® Owner’s Manual - page 3  
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The normal operating sequence of the wire feeder can be viewed on the  
board itself via sequence LED’s. When the system is triggered, the green  
Trigger LED (L3) and the yellow Gas Solenoid LED (L1) illuminate simultane-  
ously. The red Contactor/Wire Feed LED (L2) illuminates after the prepurge  
time. The blue Arc On LED (LED) illuminates as the arc is established. When  
the trigger is released the normal LED operating sequence is blue, green and  
red (L4, L3, & L2) turn off simultaneously followed by the yellow (L1) after the  
postpurge time has elasped (Figure 4).  
Yellow LED  
when solenoid  
opens.  
Red LED when  
wire feeds/con-  
tactor closes.  
L2  
Blue LED  
when arc established  
L4  
Green LED  
when triggered.  
L3  
L1  
Figure 4 - L1, L2, L3 & L4  
FOR REFERENCE, SEE MAIN P.C. BOARD CONNECTIONS PICTURE IN SECTION F  
Recommended Processes and Equipment  
The Cobramatic® is recommended for use in the GMAW and FCAW weld-  
ing applications. It is recommended for use with constant voltage power  
sources. The Cobramatic® is capable of feeding wires (diameter capacity)  
ranging from .030” through .045” solid/cored and .030” through 1/16” alumi-  
num.  
Controls and Settings  
On/Off Switch  
Placing the switch in the “ON” position energizes the feeder circuitry and the  
power indicator light.  
Wire Size Selector Switch  
The wire size selector switch changes the torque of the slave motor for the  
wire you are using. When in the .030” - .035” aluminum only position, the  
slave motor produces approximately 1 1/2 lbs inches and approximately  
4 1/2 lbs inches when in the all other wires position.  
NOTE:  
Operating the cabinet with the switch in the wrong  
position will cause wire feed difficulties.  
PosaStart Switch & Run Speed Setting  
The Posa Start Run-in Speed Control, located on the front panel, provides  
wire speed adjustment for slow wire run-in. This setting tracks as a percent-  
age of the welding wire speed setting. Once the arc has been established,  
the wire feed speed automatically changes from the slow run-in speed to the  
welding wire speed set on the gun potentiometer.  
PosaStart operation and configuration is explained later in this section.  
Trigger Normal/Trigger Latched  
This switch configures the electronic Trigger Latching mechanism. In the  
Trigger Normal mode, pull and hold the trigger to start welding functions  
- release to stop welding functions. In the Trigger Latched mode, pull and  
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release trigger to start welding functions - pull trigger again and release to  
stop welding functions.  
The Prepurge/Postpurge functions are pre-configured to provide a preset  
amount of pre & postpurge gas time; 0.25 and 2.0 second respectively. The  
default factory position of this jumper is horizontal (top right) across pins.  
Changing the position of the JP3 jumper changes the configuration of the pre  
& postpurge sequences. Refer to Figure 5 for the desired pre and postpurge  
sequence. Once the desired sequence is selected, relocate on JP3 jumper  
from its horizontal default pattern (top right) to its new vertical sequence posi-  
turn.  
Figure 5  
Pre-Purge Settings & Adjustments (JP2)  
The Pre-Purge Jumper/Pot Configuration at JP2 has 3 available settings:  
0.25 sec. fixed, variable from 0-1 sec. or variable from 0-5 seconds.  
By default, the twin two-pin jumpers, across rows 1 & 3, are configured for  
0.25 sec. Just to the left of the jumpers is a ¾-turn potentiometer (pot) which  
is used with both variable settings. For the 0-1 sec. range, move the jumpers  
across rows 3 & 5. For the 0-5 second range, move the jumpers across rows  
5 & 7 (Figure 6a).  
Rows 3 & 5: 0-1 sec.  
Figure 6a  
Rows 1 & 3: 0.25 sec. fixed  
Rows 5 & 7: 0-5 sec.  
Timing adjustment for the variable settings are as follows: Move the jumpers  
to either variable setting location. Turn potentiometer screw (Small flat or  
cross-head) half way. Pull gun trigger and count time between red contactor  
wire feed LED (L2) and yellow Gas Solenoid LED (L1). Adjust pot screw as  
necessary.  
Post-Purge Settings & Adjustments (JP1)  
The Post-Purge Jumper/Pot Configuration at JP1 has 2 available settings: 2  
sec. fixed and variable from 0-5 seconds.  
By default, the two-pin jumper across the top-and-middle pins, is configured  
for 2 sec. Just to the left of the jumper is a ¾-turn pot which is used with the  
variable setting. For the 0-5 second range, move the jumper from the top-  
and-middle to the middle-and-bottom pins (Figure 6b).  
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Middle/Bottom: 0-5 sec.  
Top/Middle: 2 sec fixed  
Figure 6b  
Timing adjustment for the variable settings are as follows: Move the jumpers  
to variable setting location. Turn potentiometer screw (Small flat or cross-  
head) half way. Upon release of gun trigger, count time between yellow Gas  
Solenoid LED (L1) and green Trigger LED (L3). Adjust as necessary.  
Posa Start Operating Procedure  
CAUTION:  
Do not operate this wire feeder on a power source having a high-fre-  
quency (HF) starting circuit until the high frequency feature has been  
turned off or disabled. Failure to disable the HF will result in damage  
to the PosaStart circuitry of the main board.  
General  
The Posa Start Run-in Speed Control, located on the front panel, provides  
adjustment for slow wire run-in. Once the arc has been established, the wire  
feed speed is automatically changed from the slow run-in speed to the weld-  
ing speed set on the gun potentiometer.  
The Posa Start feature allows the Cobramatic® feeder and gun to be used  
in conjunction with constant current DC welding power sources of open cir-  
cuit voltage in excess of 55 volts - also, any constant voltage welding power  
source capable of a minimum of 50 amps.  
Once the PosaStart circuit has transferred from slow run-in to weld speed,  
the blue LED (L4) illuminates (Figure 7).  
Blue LED  
when PosaStart engages.  
L4  
Figure 7  
CV/CC Posa Start Operations  
NOTE:  
CV Posa Start does not need welding voltage sensing lead.  
The default factory setting is CV mode. Attach Cobramatic® cabinet to CV  
power source according to the installation instructions.  
Turn the Cobramatic® cabinet to the “ON” position and the Posa Start to the  
“OFF” position. Adjust power source to desired voltage for your weld condi-  
tion. Depress gun trigger and adjust wire feed speed at gun to match voltage  
setting.  
Turn the Posa Start switch to the “ON” position. Depress gun trigger and,  
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using Run-in Speed Control, adjust wire feed rate to approximately 50% of  
welding wire speed set at gun.  
Initiate an arc, and adjust wire feed speed at gun until correct condition is  
achieved. At the moment when welding wire speed transition occurs, L4 will  
illuminate.  
POSA START WIRE SPEED NOTE:  
Because the Posa Start Run-in Speed always remains a percentage  
of the actual welding wire feed rate, the Posa Start run-in speed  
will always slow down or speed up proportional to any  
adjustment you now make at the gun. Therefore, if you slow down  
the welding wire feed speed, you will have to increase  
the Run-in Speed setting.  
Remote Operation: Input/Ouput  
The terminal strip TB1(reference Appendix pages) allows for external input  
signals for remote operation of the feeder as well as output signals for volt-  
age and wire speed measurements, for a wide variety of automatic and semi-  
automatic applications. By making connections across specific points of  
TB1, such functions as the trigger and motor speed control can be controlled  
using an external source, such as a controller interface or a PLC (program-  
mable logic controller).  
Figure 8  
Section C  
Section D  
Accessories  
None available.  
Maintenance  
Routine Maintenance  
Your Cobramatic® is designed to provide years of reliable service. Normal  
wear and component failure may require occasional service.  
The number of units in operation and the importance of minimal “down time”  
will determine to what extent spare parts should be stocked on hand.  
If repairs do become necessary, any part can easily be replaced by qualified  
shop maintenance personnel.  
Maintenance of the gun will normally consist of a general cleaning of the wire  
guide system, including tubes, drive rolls, and conduits at regular intervals.  
Remove spatter build-up from inside of nozzles with a hardwood stick.  
The only parts on the Cobramatic® system that are subject to normal wear  
are the conduit, contact tips, gas cups, front body liners, wire guides, drive  
and idler rolls. A supply of these parts should be maintained on hand.  
Cobramatic® Owner’s Manual - page 7  
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Testing the Feeder  
Testing the Input Power Circuits  
The AC circuits are protected by pico-fuses F1 and F2 (see page 13 for  
location). If these continually fail, especially when powering up the cabi-  
net, remove the connectors for the components that draw on this power, J6  
(Brake Solenoid), J7 (Slave Motor) and J5-3 & 4 (AC Contactor - if used)  
from the P.C. Board. Replace fuses and retrigger system. If fuses does not  
fail, isolate the problem by plugging in J4, J7, and J5-3,4 one at a time until  
the fuses fail.  
Testing the Speed Control  
NOTE:  
The gun should be tested prior to testing circuitry on the main board.  
Gun amphenol must be connected to the Cobramatic® to perform the  
following tests.  
To test the motor voltage circuit and measure how much voltage is being  
delivered to the gun motor, place a voltmeter across diode test points TP1 &  
TP2 and pull gun trigger. A reading between 0 VDC & 28 VDC+/- should be  
observed, as the gun potentiometer is varied (Figure 9).  
Motor Demand  
Test Point  
TP3  
Motor Voltage  
Test Point  
TP2  
Motor Voltage  
Test Point  
TP1  
Figure 9  
Testing the Gun  
Motor Check  
Remove the amphenol connector from the cabinet.  
Using the gun amphenol, check the resistance across pins “A” and “B”  
(motor leads). The resistance across the motor should be between 5-10  
ohms.  
If an open circuit or short exists, check the motor leads and motor indepen-  
dently.  
Testing the Potentiometer - “W” Clocked  
Using the gun amphenol, check the resistance across pin “D” (wiper) and  
pin “C”. The resistance should vary from 0 - 5K ohms as you turn pot.  
Check the resistance across pin “D” (wiper) and pin “G”. The resistance  
should vary from 5K - 0 ohms as you turn pot.  
Testing the Micro Switch  
Using the gun amphenol, check for continuity across pins “E” and “F” when  
the trigger is pressed.  
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Section E  
Troubleshooting  
Troubleshooting  
Symptom  
Cause  
Remedy  
Check AC circuit. Replace fuse(s).  
No wire feed at gun, feeder not oper-  
ating, i.e., no slave motor or brake  
solenoid.  
F1 & F2 fuse(s) in feeder failed.  
F3 (4 amp) fuse in feeder failed.  
Check motor leads for shorts then  
replace fuse.  
Micro-switch defective/not being acti-  
vated. Broken electrical cable.  
Replace switch. Check switch for  
operation. Check micro switch wires  
for continuity.  
Loose J2, J3, P.C. board connector.  
Check J2, J3 connectors.  
Brake solenoid inoperative.  
Solenoid defective.  
Loose connector at J6.  
Bad potentiometer.  
Replace solenoid.  
Check J6 connector.  
No wire feed at gun, feeder operating  
properly.  
Check potentiometer with meter.  
Bad gun motor.  
Check/Replace motor.  
Broken electrical cable.  
Check motor and potentiometer wires  
for continuity.  
Bad speed control/PCB.  
Check/Replace P.C. board.  
Check all power connections.  
Wire feeds, but welding wire is not  
energized.  
Loose or no cable power supply con-  
nections.  
Contactor control cable loose or in  
wrong position.  
Check power supply owner’s manual  
for location and type of contactor signal  
required, i.e. closing contacts or AC.  
Welding power source not working  
correctly.  
Check power supply for proper  
operation.  
Wire feeds erratically.  
Dirty or worn conduit.  
Blow out or replace conduit.  
Incorrect pressure on drive rolls.  
Idler roll stuck in gun.  
Adjust pressure at gun (Gold or Prince)  
Check for lock washer under idler roll,  
or replace if damaged or worn.  
Wrong size contact tip.  
See contact tip table.  
Check with meter.  
Wire feeds one speed only.  
Wire walks out of drive rolls.  
Bad potentiometer.  
Broken electrical cable in lead assy.  
Check potentiometer wires for continu-  
ity or shorts.  
Bad speed control.  
Check/Replace P.C. boards.  
Idler roll upside-down.  
Place groove in idler roll toward the  
top.  
Rear wire guide missing.  
Replace wire guide.  
Trigger inoperable or not operating  
correctly.  
Trigger mode configuration.  
Check front panel Trigger Normal/  
Latched toggle switch.  
Purge not operating correctly.  
Jumper incorrectly configured. Gas  
solenoid malfunctioning.  
Check jumper location per Jumper  
Table in Appendix. Check cable con-  
nections to gas solenoid Check valve  
in gun.  
No PosaStart Wire Speed Transition  
Welding power cable and/or gun power Welding power cable to bottom bolt.  
cable connected to wrong bolt on  
power block.  
Gun power cable to top bolt.  
Welding current not being sensed.  
Wires not connected at TB1  
Check current sensor in power block.  
Reseat all wire connections at TB1.  
Remote Functions Not Working  
Cobramatic® Owner’s Manual - page 9  
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Section F  
Appendices  
Diagrams/Parts List  
Main P.C. Board Connections...................................................13  
Cabinet and Gun Connections .................................................14  
001-4022 Cobramatic® Assembly.............................................15  
003-2237 Cobramatic® Front Panel Assembly ......................... 17  
003-2068 Cobramatic® Slave Motor Assembly......................... 18  
003-2063 Cobramatic® Power Block Assembly........................ 19  
003-2146 Cobramatic® Spindle Assembly................................ 20  
003-2137 Gas Solenoid Assembly ...........................................21  
843-0496 LE Cobramatic® Control Cable................................. 22  
071-0402 LE Cobramatic® Block Diagram................................ 23  
071-0400 Cobramatic® Main P.C. Board .................................. 24  
071-0367 Cobramatic® Gun Connections................................. 26  
Input/Output Configuration for TB1........................................... 27  
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Main P.C. Board Connections  
P2  
P1  
Post-Purge  
Trim Pot  
Pre-Purge  
Trim Pot  
L4  
Lit: Weld Speed  
(blue)  
TP3  
Motor  
Demand  
TB1  
Remote Input/Output  
JP3  
JP1 & JP2  
Adj. Gas Purge Jumper  
Gas Purge Jumper  
L3  
Green (Trigger “on”)  
J2  
Gas Solenoid  
TP2  
Test Point  
MTR VDC  
TP1  
Test Point  
GROUND  
L1  
Gas “on” (yellow)  
J11  
Front Panel  
L2  
Red (contactor  
signal “on”)  
J1  
Trigger  
Normal/Latch  
F2  
Line Fuse  
J4  
Front Panel  
J7  
J10  
Slave Motor  
Transformer  
F1  
Line Fuse  
J8  
Current Sensor  
J9  
F3  
Brake Solenoid  
Motor Fuse  
J5  
J6  
Terminal Strip  
Terminal Strip  
Control Cable  
LE P/N L10708-1 MK P/N 843-0496  
Input Power - 42 VAC Hot-Black  
Input Power - 42 VAC Neutral-White  
Chasis Ground (Green)  
Closing Contacts Out  
Closing Contacts Out  
Weld Posa Start voltage sensing lead ground  
Cobramatic® Owner’s Manual - page 13  
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Cabinet and Gun Connections  
Water Cooled  
Input Connections  
Gun Connections  
Coolant  
Supply  
Power/  
Coolant In  
Coolant  
Return  
Shielding  
Gas  
Coolant  
Return  
Welding  
Power  
Gas  
Power  
Cable  
Input  
Air Cooled  
Gun  
Shielding  
Gas  
Gas  
Welding  
Power  
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003-2237 Front Panel Assembly  
Cobramatic® Owner’s Manual - page 17  
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003-2068 Slave Motor Assembly  
Cobramatic® Owner’s Manual - page 18  
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003-2063 Power Block Assembly  
Cobramatic® Owner’s Manual - page 19  
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003-2146 Spindle Assembly  
Cobramatic® Owner’s Manual - page 20  
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003-2137 Gas Solenoid Assembly  
Cobramatic® Owner’s Manual - page 21  
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843-0496 LE Cobramatic® Control Cable  
Cobramatic® Owner’s Manual - page 22  
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071-0402 Cobramatic® Block Diagram  
Cobramatic® Owner’s Manual - page 23  
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071-0400 Cobramatic® Main PC Board  
Cobramatic® Owner’s Manual - page 24  
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071-0400  
Cobramatic® Main PC Board  
Cobramatic® Owner’s Manual - page 25  
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071-0367 Cobramatic® Gun Connections  
and Front Panel Schematic  
Cobramatic® Owner’s Manual - page 26  
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Input / Output Configuration for TB1  
Monitor Wire Feed Speed  
Use digital volt meter between: TB1 – 1(GND) and TB1 – 2(MSPD).  
Measured value defined as: Reading x 100 = Wire Feed Speed.  
Example: 3.54 VDC is equivalent to 354 IPM  
MVSPODLT METER  
GND  
TB1  
Remote/External Trigger  
Install jumper between: TB1 – 1(GND) and TB1 – 3(TRIG) to trigger system.  
TRIG  
SW  
GND  
TB1  
Arc Establish Relay Closure  
External Contact Signal; Connect 24VDC relay coil between TB1 – 8 (24V)  
and TB1 – 4 (ARC). When arc is established, the relay coil will close.  
ARC ESTABLISHED  
K?  
ARC ESTABLISHED  
24V  
ARC  
ARC ESTABLISHED RELAY  
TB1  
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Cobramatic® Owner’s Manual - page 28  
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Torch Pot Output  
Some power supplies can utilize a variable DC voltage signal from the gun  
potentiometer adjustment as their external voltage control. Adjusting the  
potentiometer at the gun will give 0 to 10VDC output between TB1 – 1 (GND)  
and TB1 – 6 (POT).  
POT  
GND  
TB1  
A common “synergic” type of setup is to have the gun potentiometer signal  
control the welding voltage of the welding power supply. As this external  
signal adjusts the voltage up or down, its external 0-10VDC signal can come  
back into TB-1, as shown below in External Motor Speed Control, and control  
the wire feed speed.  
DMD  
0 TO 10VDC  
GND  
TB1  
This is mainly dependant on the configuration and signal adaptation of the  
welding power supply. Check with your welding equipment manufacturer to  
see if your welding power source has this feature or can adapt to this type of  
setup. Not all welding power sources can do this.  
Cobramatic® Owner’s Manual - page 29  
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Manual Gas Purge  
Jumper from TB1-7 to TB1-1 to externally operate the gas solenoid in the cabinet  
Cobramatic® Owner’s Manual - page 30  
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Cobramatic® Owner’s Manual - page 31  
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Copyright © 2002 Lincoln Global Inc.  
Cobramatic® Owner’s Manual - page 32  
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LIMITED WARRANTY  
Effective October 1, 2006  
This warranty supersedes all previous MK Products warranties and is  
exclusive, with no other guarantees or warranties expressed or implied.  
Classification of any item into the foregoing categories shall be at  
the sole discretion of MK Products. Notification of any failure must  
be made in writing within 30 days of such failure.  
LIMITED WARRANTY - MK Products Inc., Irvine, California  
warrants that all new and unused equipment furnished by MK  
Products is free from defects in workmanship and material as of  
the time and place of delivery by MK Products. No warranty is  
made by MK Products with respect to trade accessories or other  
items manufactured by others. Such trade accessories and other  
items are sold subject to the warranties of their respective manu-  
facturers, if any.  
A copy of the invoice showing the date of sale must accompany  
products returned for warranty repair or replacement.  
AllequipmentreturnedtoMKProductsforservicemustbeproperly  
packaged to guard against damage from shipping. MK Products  
will not be responsible for any damages resulting from shipping.  
MK Products’ warranty does not apply to components having  
normal useful life of less than one (1) year, such as relay points,  
wire conduit, tungsten, and welding gun parts that come in contact  
with the welding wire, including gas cups, gas cup insulators, and  
contact tips where failure does not result from defect in workman-  
ship or material.  
Normal surface transportation charges (one way) for products  
returned for warranty repair or replacement will be borne by MK  
Products, except for products sold to foreign markets.  
ANY EXPRESS WARRANTY NOT PROVIDED HEREIN AND ANY  
IMPLIED WARRANTY, GUARANTY, OR REPRESENTATION AS TO  
PERFORMANCE, AND ANY REMEDY FOR BREACH OF CONTRACT  
WHICH, BUT FOR THIS PROVISION, MIGHT ARISE BY IMPLICA-  
TION, OPERATION OF LAW, CUSTOM OF TRADE, OR COURSE OF  
DEALING, INCLUDING ANY IMPLIED WARRANTY OF MERCHANT-  
ABILITY OR OF FITNESS FOR PARTICULAR PURPOSE, WITH  
RESPECTTOANYANDALLEQUIPMENTFURNISHEDBYMKPROD-  
UCTS, IS EXCLUDED AND DISCLAIMED BY MK PRODUCTS.  
MK Products shall, exclusively remedy the limited warranty or  
any duties with respect to the quality of goods, based upon the  
following options:  
(1) repair  
(2) replacement  
(3) where authorized in writing by MK Products, the reasonable  
cost of repair or replacement at our Irvine, California plant.  
As a matter of general policy only, MK Products may honor an  
originaluser’swarrantyclaimsonwarrantedequipmentintheevent  
of failure resulting from a defect within the following periods from  
the date of delivery of equipment to the original user:  
EXCEPT AS EXPRESSLY PROVIDED BY MK PRODUCTS IN WRIT-  
ING, MK’s PRODUCTS ARE INTENDED FOR ULTIMATE PURCHASE  
BY COMMERCIAL/INDUSTRIAL USERS AND FOR OPERATION BY  
PERSONS TRAINED AND EXPERIENCED IN THE USE AND MAIN-  
TENANCE OF WELDING EQUIPMENT AND NOT FOR CONSUMERS  
OR CONSUMER USE. MK PRODUCTS’ WARRANTIES DO NOT  
EXTEND TO, AND NO RE-SELLER IS AUTHORIZED TO EXTEND  
MK PRODUCTS’ WARRANTIES TO ANY CONSUMER.  
1. Power Supplies and Wire Feed Cabinets...........3 years  
2. Weldheads, Positioners, Prince XL and Prince XL Spool  
Guns, Python, CobraMAX, Cobra SX, Cobra MX.............  
.............................................................................1 year  
3. Sidewinder® Spool Gun, Prince SG Spool Guns,  
Modules .......................................................... 180 days  
4. Repairs/Exchanges/Parts ............................... 90 days  
USE OF OTHER THAN GENUINE MK PRODUCTS’  
CONSUMABLES, PARTS, AND ACCESSORIES MAY INVALIDATE  
YOUR PRODUCT WARRANTY.  
16882 Armstrong Ave.  
Irvine, CA 92606  
Tel (949)863-1234  
Fax (949)474-1428  
October 1, 2006  
Copyright © 2007 Lincoln Global Inc.  
®
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World’s Leader in Welding and Cutting Prodcuts  
Sales and Service through Subsidiaries and Distributors Worldwide  
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com  
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