Typical Wiring Diagrams; Troubleshooting - Murphy TATTLETALE 518APH Installation And Operation Manual

Figure 1 shows a jumper installed between "SW1 and "SW2".
SWICHGAGE instruments are normally open. This is not a
®
Closed Loop™ circuit.
Figure 1
518PH / 518APH / 518E
R
G NO NC SW1 SW2 B
"Energized"
**
To Shutdown
*
Solenoid Operator
"De-energized"
To Shutdown
Fuel Valve
"De-energized"
or
To Shutdown
Solenoid
Ignition Coil
Operator
*
In-Line Fuse should be removed on "energized" to shutdown configurations.
**
Applies to 518APH model.
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
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
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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.

TYPICAL WIRING DIAGRAMS

Ammeter
14 Amp
*
In-Line Fuse
Ignition
Switch
Normally Open
SWICHGAGE Instruments
®
Battery

TROUBLESHOOTING

® is equipped with
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819
Rosenberg, Texas 77471 USA
Phone: 281.633.4500 Fax: 281.633.4588
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Church Rd Laverstock
Salisbury SP1 1QZ UK
Phone: +44 1722 410055 Fax: +44 1722 410088
E-mail: sales@fwmurphy.co.uk
Web site: www.fwmurphy.co.uk
Figure 2 shows a Closed Loop™ circuit with normally open Murphy
SWICHGAGE ® instruments and Normally Closed switches (alignment
and "V" belt switches, etc.).
518PH / 518APH / 518E
G NO
"Energized"
**
To Shutdown
*
Solenoid Operator
"De-energized"
To Shutdown
Fuel Valve
"De-energized"
To Shutdown
Ignition Coil
*
In-Line Fuse should be removed on "energized" to shutdown configurations.
**
Applies to 518APH model.
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
With engine running, jumper "SW1" to "G" terminal. If switch trips and
engine shuts down, trouble could be SWICHGAGE
contact, lack of good case ground on SWICHGAGE
Lack of case ground on SWICHGAGE
Verify that mounting bracket on the SWICHGAGE
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
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 ® .
COMPUTRONIC CONTROLS, LTD
41 - 43 Railway Terrace Nechells
Birmingham B7 5NG UK
Phone: +44 121 327 8500 Fax: +44 121 327 8501
E-mail: info@computroniccontrols.com
Web site: www.computroniccontrols.com
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Hangzhou Economic & Technological Development Area
Hangzhou, Zhejiang, 310018, China
Phone: +86 571 8788 6060 Fax: +86 571 8684 8878
00-02-0187 page 2 of 2
Figure 2
Ammeter
R
NC SW1 SW2 B
14 Amp
*
In-Line Fuse
Normally Open
SWICHGAGE ® Instruments
Normally
Switches
controls (wired according to Figure 1).
®
®
®
, or broken/cut wire.
® .
®
® to make contact.
Printed in U.S.A.
Ignition
Switch
Battery
Closed
contacts not making
has broken through