Murphy Automobile Parts WD300 LV User Manual

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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