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Murphy 518PH Folheto

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Push button will not remain in the depressed position after
engine startup (wired according to Figure 2).
• Be sure oil pressure is adequate to raise pointer past SWICHGAGE
®
contact. (Not necessary if oil pressure SWICHGAGE
®
is equipped with
push button lockout.)
• Visually check wiring for loose connections, frayed wiring, etc. on all
terminals and within switch loop circuit.
• Check 14 amp fuse connected to “B” terminal.
• Check for good ground on “G” terminal.
• Disconnect switch loop circuit from “SW1” and “SW2” terminals. Place
a temporary jumper between SW1 and SW2 and restart engine. If the
push button stays in with engine running, the 518PH, 518APH & 518E is
not the problem. This indicates either an open circuit, unwanted ground,
or too high resistance in switch loop circuit wiring between “SW1” and
“SW2”.
• Verify continuity by performing the following:
1. Disconnect switch loop circuit from “SW1” and “SW2” terminals. 
2. Remove power from “B” terminal.
3. Use an ohmmeter to check for “good continuity” (25 ohms or less)
through switch loop circuit. If good continuity is indicated, proceed
to Step 4.
4. Adjust SWICHGAGE
®
contact away from pointer. Check continuity
between one end of loop circuit, “SW1 or “SW2” and ground. Good
continuity (25 ohms or less) indicates an unwanted ground in loop cir-
cuit such as a terminal rotating against the mounting panel. Remove
ground, restore loop circuit connections to “SW1” and “SW2”.
5. Reconnect power to “B” terminal and restart engine.
6. Using an ohmmeter, check resistance between one end of the loop
circuit to the other. Resistance should not exceed 25 ohms. If resis-
tance is too high, check for loose connections in loop circuit.
Otherwise select larger size wire for loop circuit.
Engine fails to shutdown when contacts close on one-wire to
ground SWICHGAGE
®
controls (wired according to Figure 1).
With engine running, jumper “SW1” to “G” terminal. If switch trips and
engine shuts down, trouble could be SWICHGAGE
®
contacts not making
contact, lack of good case ground on SWICHGAGE
®
, or broken/cut wire.
Lack of case ground on SWICHGAGE
®
.
Verify that mounting bracket on the SWICHGAGE
®
has broken through
the panel paint and has made good contact with bare metal. If good con-
tact has not been made, tighten mounting stud nuts accordingly.
Failure of contacts on SWICHGAGE
®
to make contact.
Adjust contacts back and forth against the pointer to give a wiping and
cleaning action on contacts. If this does not correct the problem, replace
SWICHGAGE
®
.
TROUBLESHOOTING
TYPICAL WIRING DIAGRAMS
G
NO
R
NC
SW1
SW2 B
“Energized” 
To Shutdown 
Solenoid Operator
*
“De-energized” 
To Shutdown
Fuel Valve 
“De-energized” 
To Shutdown
Ignition Coil 
Normally Open
SWICHGAGE
®
 Instruments
Ammeter
14 Amp
In-Line Fuse
*
* 
In-Line Fuse should be removed on  “energized” to shutdown configurations.
Ignition 
Switch
Battery
518PH / 518APH / 518E
Normally 
Closed
Switches
**
** 
Applies to 518APH model.
G
NO
R
NC
SW1
SW2 B
“De-energized” 
To Shutdown
Fuel Valve
or
Solenoid 
Operator 
“De-energized” 
To Shutdown
Ignition Coil 
Normally Open
SWICHGAGE
®
 Instruments
Ammeter
Ignition 
Switch
Battery
518PH / 518APH / 518E
14 Amp
In-Line Fuse
*
“Energized” 
To Shutdown 
Solenoid Operator
*
* 
In-Line Fuse should be removed on “energized” to shutdown configurations.
**
** 
Applies to 518APH model.
Figure 1 shows a jumper installed between “SW1 and “SW2”. 
SWICHGAGE
®
instruments are normally open. This is not a 
Closed Loop™ circuit.
Figure 2 shows a Closed Loop™ circuit with normally open Murphy
SWICHGAGE
®
instruments and Normally Closed switches (alignment
and “V” belt switches, etc.).
Figure 2
Figure 1
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.
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819
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Phone: 281.633.4500  Fax: 281.633.4588
E-mail: sales@fwmurphy.com
Web site: www.fwmurphy.com
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E-mail: info@computroniccontrols.com
Web site: www.computroniccontrols.com
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Phone: +86 571 8788 6060  Fax: +86 571 8684 8878
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+1.918.317.4100  Fax: +1.918.317.4266 
E-mail: sales@fwmurphy.com
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E-mail: ipdsales@fwmurphy.com
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