WS-93002N
Revised 04-06
Section 30
(00-02-0191)
Murphy W-Series Engine Panels
General Installation Instructions
Read the following information before installing. These installation instructions are typical for a variety of W-Series engine panels and may
not reflect the exact configuration for your panel assembly. It is assumed that the installer is familiar with engine operations and has basic
mechanical and electrical skills. If additional assistance is needed, please call your Murphy dealer or contact one of our offices at the numbers
listed on this instruction sheet. A visual inspection for any damage which may have occurred during shipping is recommended.
GENERAL INFORMATION
WARNING
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT
✔
✔
✔
✔
Disconnect all electrical power to the machine.
Make sure the machine cannot operate during installation.
WD300-LV
Follow all safety warnings of the machine manufacturer.
Read and follow all installation instructions.
Description
®
Generally, pressure and temperature Swichgage contacts are wired to a depending upon the operation to be performed, the type of electrical
®
central nerve center called a Magnetic Switch or Tattletale annunciator. power available and the type of alarm or shutdown device used.
This nerve center is essentially a relay and, when signaled by a Typical wiring diagrams for the popular Tattletale annunciators and magnet-
Swichgage contact operation, it either makes or breaks a circuit to oper- ic switches are included in this instructions. If a drawing of the specific
ate an alarm or engine shutdown device. Various nerve centers are used model number is enclosed, refer to that drawing for specific wiring.
CAUTION: Certain dangers to human safety and to equipment may occur if some equipment is stopped without pre-warning. It is recommended that
monitored functions be limited to alarm only or to alarm before shutdown.
INSTALLATION INFORMATION
Mounting the Panel
Connecting the Pressure Swichgage
1. Pressure tubing is generally not provided. Use of good quality flexi-
ble pressure tubing/hose and fittings is strongly suggested. Use at
WARNING: Perform mounting operation with power source OFF.
Disable the engine so it cannot start. Remove the battery ground cable.
3
least /16 in. (5 mm) I.D. tubing. If using copper or rigid
tubing, install at least 12 in. (305 mm) flexible hose from the pres-
sure Swichgage instrument to the rigid tubing. This prevents damag-
ing vibration from reaching the Swichgage instrument.
1. Select a suitable mounting location on or near the engine. The location
should provide easy access to the panel and provide unobstructed
viewing of the Swichgage instruments.
1
2. The mounting location should avoid shock and vibration to the extent
possible. Generally, a location low on the engine is preferred. Avoid
mounting on top of the engine if possible. Shockmounts are
suggested where possible to dampen shock and vibration.
2. Connect the pressure tubing to the /8-27 NPT pressure port of the
pressure Swichgage instrument. Use of a non-hardening thread seal-
ing compound is recommended although the thread is “dry seal”. Be
sure that thread sealant does not foul the pressure orifice.
NOTE: The orifice can be removed for cleaning.
IMPORTANT: Use of improper shockmounts can accelerate the shock
and vibration effects. Consult the factory if you are in doubt.
3. Connect the pressure tubing to the pressure galley of the engine.
Generally this is at the oil filter housing. Use of non-hardening
thread sealant is recommended. Avoid droops or sink traps in
routing of the pressure line.
NOTE: If shockmounts are used, it is suggested that a separate ground
wire be attached to the panel assembly and to the engine. This assures
electrical continuity between the Swichgage contacts and the battery
ground across the shockmounts (see mounting detail below).
Installation Accessories
DETAIL
Tools and equipment needed:
shockmount
®
●
●
●
●
●
Thread sealant or Teflon tape.
engine
panel
Straight edge screwdriver (medium).
Wire stripping and terminal crimping tools.
Electrical wire for use on power connections.
Adjustable wrench or open end wrench set.
nut and
washer
nut and
washer
panel
engine
frame
electrical
ground jumper
WS-93002N page 1 of 7
®
Setting the SWICHGAGE contacts
Testing the SwichgageInstruments
1. Face mounted contacts are set using a 1/16 in. hex wrench.
For face mounted contacts (20P, 20T, 20PW7, etc.):
1
2. Some models such as 20PE, 20TE, etc. may not have field adjust-
1. With the engine running; use a /16 in. hex wrench to rotate the con-
ment. Consult the factory if in doubt.
tact until it touches the gauge pointer. Do NOT force the contact
against the pointer. Engine should shut down and/or alarm should
operate. Reset the contact.
3. Observe the “normal operating” oil pressure and coolant tempera-
ture readings. Set the oil pressure Swichgage contact slightly below
the minimum reading observed or slightly above the minimum
pressure recommended by the engine manufacturer.
2. An alternative method of testing the
shutdown circuit is to place a coin
or other metal object between the
contact adjustment and the bezel.
NOTE: This method does NOT test
the actual contact pair. It does test the
circuit beyond the contact.
WARNING: If the pressure Swichgage instrument has a
lockout push button on the face, a contact setting higher than the
factory setting will make the lockout device inoperative.
4. Set the temperature Swichgage contact slightly above the “normal
operating” temperature reading observed or slightly below the maxi-
mum temperature recommended by the engine manufacturer.
NOTE: More detailed instructions are contained in Installation Sheet
P-95033N for pressure Swichgage instruments and T-8446N for
Temperature Swichgage instruments.
3. VERY IMPORTANT Each time you
start the engine, observe that the Swichgage instruments are indicat-
ing pressure or temperature, etc. Visual inspection and regular test-
ing should be normal procedure to ensure proper operation and to
achieve maximum results from your Swichgage system.
TYPICAL WIRING DIAGRAM WITH 117PH MAGNETIC SWITCH
CAUTION: This wiring is typical for Murphy W-Series small engine panels. Items shown may or may not be included in your panel;
however, the circuit is typical of how the component will be wired if it is included. Refer to installation instructions for the specific
component if included. For off-panel items such as shutdown devices, see specific instructions supplied with the device.
Tachometer
Model 117PH
B
+
117PH
Use for 12 or 24 VDC
SIG GRD
To Magnetic Sensor,
20T
Other
20P
Alternator “Tach”
Terminal, or
Temperature
Swichgage instruments
Pressure
C
S
B
Signal Generator
_
+
Hourmeter
_
+
Voltmeter
PB128S Stop Switch
Ignition coil
Distributor
Fuel Valve
Ammeter
_
+
_
+
Battery
BAT
ST
IGN
ACC
S
Start
Switch
B
Energized
to Run
Starter
Rack Pull Solenoid
(RP2300 Series shown)
B
+
Exciter
Alternator
WS-93002N page 3 of 7
TYPICAL WIRING WITH 518PH TATTLETALE CLOSED LOOP
CAUTION: This wiring is typical for Murphy W-Series small engine panels. Items shown may or may not be included in your panel;
however, the circuit is typical of how the component will be wired if it is included. Refer to installation instructions for the specific
component if included. For off-panel items such as shutdown devices, see specific instructions supplied with the device.
Tachometer
518PH WIRED CLOSED LOOP
MUST specify 12 or 24 VDC
B
+
518PH
SIG GRD
To Magnetic Sensor,
Alternator “Tach”
Terminal, or
R
20T-F
G
NC
SW1
SW2
B
Other
Swichgage instruments
20P-F
Hourmeter
Temperature
Signal Generator
Pressure
_
+
Voltmeter
_
+
PB128S Stop Switch
From
To
Other Normally Closed Contacts
Ammeter
_
+
Distributor
_
+
Battery
Ignition coil
BAT
ST
IGN
ACC
S
Fuel Valve
Start
Switch
B
Energized
to Run
Starter
Energized to Run
Rack Pull Solenoid
(RP2300 Series shown)
B
+
Exciter
Alternator
WS-93002N page 4 of 7
TYPICAL WIRING DIAGRAM WITH 518PH TATTLETALE JUMPERED
CAUTION: This wiring is typical for Murphy W-Series small engine panels. Items shown may or may not be included in your panel;
however, the circuit is typical of how the component will be wired if it is included. Refer to installation instructions for the specific
component if included. For off-panel items such as shutdown devices, see specific instructions supplied with the device.
Tachometer
518PH WIRED WITH JUMPER
Must specify 12 or 24 VDC
B
+
518PH
SIG GRD
To Magnetic Sensor,
Alternator “Tach”
Terminal, or
R
G
NC
SW1
SW2
B
20T
Other
20P
Hourmeter
Temperature
Signal Generator
Swichgage instruments
Pressure
_
+
Jumper
Voltmeter
_
+
PB128S Stop Switch
Distributor
Ammeter
_
+
_
+
Battery
Ignition coil
BAT
ST
IGN
ACC
S
Fuel Valve
Start
Switch
B
Energized
to Run
Starter
Energized to Run
Rack Pull Solenoid
(RP2300 Series shown)
B
+
Exciter
Alternator
WS-93002N page 5 of 7
TYPICAL WIRING DIAGRAM WITH 760A AND 761APH
CAUTION: This wiring is typical for Murphy W-Series small engine panels. Items shown may or may not be included in your panel;
however, the circuit is typical of how the component will be wired if it is included. Refer to installation instructions for the specific
component if included. For off-panel items such as shutdown devices, see specific instructions supplied with the device.
760A and 761APH
Must specify 12 or 24 VDC.
Specify positive or
negative ground.
Tachometer
760A/761APH
TD
B+
30 second time delay
standard.
SIG GRD
NOTE 1
To Magnetic Senso
Alternator "Tach"
Terminal, or
G
NO
NC
S
B
20T
Other
20P
Pressure
Hourmeter
Temperature
Swichgage instruments
_
Signal Generator
+
Voltmeter
_
+
PB128S Stop Switch
Ammeter
_
+
_
+
Distributor
Ignition coil
Battery
BAT
ST
IGN
ACC
S
Start
B
Switch
Fuel Valve
(Murphy's SV Series)
Starter
Energized
to Run
Energized to Run Rack Pull Solenoid
(Murphy's RP2300 Series shown)
B
+
Exciter
Alternator
NOTE 1: With terminal “G” grounded, the time delay operates only on start; after the initial time delay,
the shut-down circuit is operated immediately when Swichgage contact operates.
With terminal “G” not grounded, the time delay operates both on start and stop.
WS-93002N page 6 of 7
TROUBLESHOOTING TIPS
Make sure the voltage and current requirements are within the W-Series ratings. Determine the polarity for
the application. Use appropriate wire size for voltage and current.
These instructions will assist in the correction of most problems which you may encounter with the panel. Before checking the list, first refer
to the wiring connections and operation procedures and make sure the panel is properly installed. If problems persist after making the
following checks, consult any Murphy facility.
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
Engine will not start.
1. Blown fuse at magnetic switch.
1. Replace fuse.
2. Accidental ground to (S) or (C) terminals.
3. Overload circuit due to accessories.
4. Open circuit in 518PH wiring.
2. Check for ground and correct.
3. Re-route accessory circuits.
4. Repair circuit.
Pointer burned in two.
False shutdown.
Overload of pointer contact due to exces
sive load or short circuit.
Remove or reduce load; remove short circuit and replace
Swichgage instrument.
1. Wire from Swichgage instrument is
grounded or shorted to contact.
2. Closed Loop circuit has intermittent
open or short.
1. Remove ground or short.
2. Check all wiring and repair.
3. Isolate panel from shock/vibration.
3. Excessive shock or vibration causes
magnetic switch to trip.
4. Lack of coolant around temperature sensing
bulb causes “hot spot”.
4. Check coolant level; loosen the union nut to allow trapped
air to escape.
5. Temperature capillary routed too close to
exhaust manifold.
5. Reroute temperature capillary.
®
SWICHGAGE contact closes
Incomplete circuit.
Locate open circuit and repair; turn the contact adjustment
against the pointer causing them to “wipe” against each
other. Be sure magneto is providing power to primary
terminal post. CD type magnetic switch used with magneto.
but does not trip the magnetic
switch to stop the engine.
Inaccurate readings.
1. Pressure orifice plugged with thread sealant.
2. Temperature capillary rerouted too close to
exhaust manifold.
1. Remove and clean pressure orifice.
2. Reroute capillary.
3. Broken or crushed temperature capillary.
3. Replace Swichgage instrument.
Engine does not stop
immediately.
Fuel shutoff valve used on diesel engine.
Be sure all fittings are air tight; use check valve in bypass
line; use rack puller in place fuel valve.
Magnetic Switch trips but
engine does not stop.
Feedback from alternator.
Install diode in excitation circuit.
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product.
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
specifications and designs at any time. MURPHY, the Murphy logo, and Swichgage® are registered and/or common
law trademarks of Murphy Industries, Inc. This document, including textual matter and illustrations, is copyright
protected by Murphy Industries, Inc., with all rights reserved. (c) 2006 Murphy Industries, Inc.
www.fwmurphy.com
9 1 8 .3 1 7 .4 1 0 0 Email: sales@fwmurphy.com
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
WS-93002N page 7 of 7
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