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Wiring the OS77 Series
WARNING: BEFORE WIRING THE OS77 MAKE SURE THE
POWER SOURCE IS OFF AND EQUIPMENT IS STOPPED.
OS77D Model Typical Wiring Diagram
OS77
518PH/518APH
5
1 2 3 4
R
***
G
NO
NC SW1 SW2
*
Pickup
**
–
+
Fuel Valve
Ignition Coil
OS77I Typical Wiring Diagram
518PH/518APH
OS77
5
R
1 2 3 4
***
G
NC SW1 SW2
NO
*
–
+
To Distributor
Ignition Coil
Fuel Valve
OS77I Typical Wiring Diagram
OS77
169PH Magnetic Switch
5
***
1 2 3 4
B
Pickup
**
*
Applies to 518APH model.
**
Always use shielded cable.
***
Applies to Relay output models only. B+ can be
switched on Relay output models if desired.
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.
FRANK W. MURPHY MANUFACTURER P.O. Box 470248; Tulsa, Oklahoma 74147; USA tel. (918) 627-3550 fax (918) 664-6146 e-mail sales@fwmurphy.com http://www.fwmurphy.com
®
FRANK W.
Since 1939
MFR.
BSI
NATIONAL
ACCREDITATION
OF CERTIFICATION
BODIES
USA–ISO 9001
FM 28221
UK–ISO 9002
FM 29422
Printed in U.S.A.
HOOK UP AND ADJUSTMENTS
(Negative Ground Only)
Key Switch
Pressure
Temp.
B
–
Battery
To Starter
Rack Puller
(Distributor Ignition Applications)
Key Switch
Pressure
Temp.
B
–
Battery
To Starter
Rack Puller
(For Shutting Down Magneto Ignitions)
Ignition
S
C
G
+
–
Battery
FRANK W. MURPHY SOUTHERN DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
tel. (281) 342-0297 fax (281) 341-6006
e-mail sales@fwmurphy.com
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
tel. +44 1722 410055 fax +44 1722 410088
e-mail sales@fwmurphy.co.uk
http://www.fwmurphy.co.uk
FRANK W. MURPHY FRANCE
tel. +33 1 30 762626 fax +33 1 30 763989
Setting the OS77 Series
The OS77 Series module must be fully installed and properly wired before
attempting any of adjustment steps. These adjustment steps must be per-
formed before the fine tuning can be accomplished and should be performed
for first time setup of the OS77.
Note for relay output models only (OS77R): The following instructions
assume terminal 5 is grounded. Relay contacts are between terminals 2& 5.
I
1
. Turn the "SPEED ADJ. " potentiometer
B
S
fully clockwise (Detail 1).
2
To
. Remove the wire from terminal #2 of
Starter
the OS77 terminal block (Detail 2).
+
3
. Start engine and run at the highest
RPM desired. This is the RPM at
which the engine should be shut-
down if exceeded.
4
. Connect a Voltmeter or a test light
between terminals #1 (positive+) and
terminal #2 (negative) of the OS77 ter-
minal block. You should read no voltage
or the test lamp will be OFF.
5
. Slowly turn the "SPEED ADJ. "
pot counter-clockwise and stop
the INSTANT the battery volt-
I
age is indicated on the meter
B
S
or the test light comes ON.
6
. Slowly turn "SPEED ADJ."
To
pot clockwise about 1/8 of an
Starter
+
inch. Now, tighten the locknut
(bigger nut) on the SPEED
ADJ. pot without disturbing
the setting.
7
. Re-connect the wire to terminal
#2 on the OS77 terminal block.
This reconnects the SPEED
shutdown circuitry.
NOTE: If further adjustment (fine tuning) is needed: Turning the SPEED
ADJ. pot clockwise, RAISES the shutdown point. This allows the engine to
run at a HIGHER RPM. Turning the SPEED ADJ. counter-clockwise LOW-
ERS the shutdown point. This will shutdown the engine at a LOWER RPM.
Warranty
A two year limited warranty on materials and workmanship is
provided with this Murphy product. Details are available on
request and are packed with each unit.
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
tel. +52-48-206264 fax +52-48-206336
e-mail murmexsl@sanluis.podernet.com.mx
FRANK W. MURPHY PTE., LTD.
No. 2 Tuas South Street 2,
Sprintecs Bldg., #02-01/02
Singapore 638042
tel. +65 863-1398 fax +65 863-0208
e-mail fwmsales@fwmurphy.com.sg
Detail 1
OS77 Module
Front View
Lower
Raise
Speed Adj.
Potentiometer
Detail 2
OS77 Module
Back View
1 2 3 4
To Battery–
To Pickup
To Battery +
Light
+
--
OR
Meter
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
tel. (661) 272-4700 fax (661) 947-7570
e-mail sales@murphyswitch.com
http://www.murphyswitch.com
MACQUARRIE CORPORATION
1620 Hume Highway;
Campbellfield, Vic 3061; Australia
tel. +61 3 9358-5555 fax +61 3 9358-5558
e-mail murphy@macquarrie.com.au
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