
HOOK UP AND ADJUSTMENTS
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 (Negative Ground Only)
OS77518PH/518APH
Key Switch
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.
1 2 3 4 | 5 |
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*** | R | |
| G NO NC SW1 SW2 B |
*
Pickup**
+ –
Pressure Temp.
Hold | To Starter | |
coil | ||
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B S
To
Starter
–+
Battery
1. | Turn the “SPEED ADJ. ” potentiometer | Detail 1 | ||
| fully clockwise (Detail 1). |
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2. Remove the wire from terminal #2 of | OS77 Module | |||
| the OS77 terminal block (Detail 2). | |||
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3. Start engine and run at the highest |
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| RPM desired. This is the RPM at |
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| which the engine should be shut- | Lower | Raise | |
| down if exceeded. | |||
| Speed Adj. | |||
4. | Connect a Voltmeter or a test light | |||
Potentiometer | ||||
| between terminals #1 (positive+) and |
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| terminal #2 (negative) of the OS77 ter- |
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Ignition Coil | Fuel Valve | Rack Puller |
OS77I Typical Wiring Diagram (Distributor Ignition Applications)
OS77 | 518PH/518APH |
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Key Switch
minal block. You should read no voltage |
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or the test lamp will be OFF. | Detail 2 |
5. Slowly turn the “SPEED ADJ. ” | OS77 Module |
pot | |
the INSTANT the battery volt- | Back View |
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Pressure
Temp.
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age is indicated on the meter |
1 2 | 3 4 | 5 |
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*** G NO NC SW1 SW2 | B | |||
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+ –
To Distributor
Hold coil
B S
To
Starter
– +
Battery
To Starter
or the test light comes ON. |
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6. Slowly turn “SPEED ADJ.” |
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pot clockwise about 1/8 of an | 1 | 2 | 3 | 4 |
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inch. Now, tighten the locknut |
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(bigger nut) on the SPEED |
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| To Battery– | |
ADJ. pot without disturbing |
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the setting. |
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| To Pickup | |
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7. |
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| To Battery + | |||
#2 on the OS77 terminal block. |
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| Light | ||||||
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Ignition Coil | Fuel Valve | Rack Puller |
OS77I Typical Wiring Diagram (For Shutting Down Magneto Ignitions)
OS77 | 169PH Magnetic Switch | Ignition |
| 5 |
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1 2 3 4 | *** |
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| B | S | C G |
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| Pickup** |
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| + | – |
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| Battery |
* Applies to 518APH model. ** Always use shielded cable.
*** Applies to Relay output models only. B+ can be switched on Relay output models if desired.
This reconnects the SPEED | + |
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shutdown circuitry. |
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| Meter | OR | |
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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.
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.
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)
■FRANK W. MURPHY SOUTHERN DIVISION
FRANK W. | ® | P.O. Box 1819; Rosenberg, Texas 77471; USA | |
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Since 1939 | MFR. | tel. (281) | |
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| ■ FRANK W. MURPHY, LTD. |
| BSI |
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| Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K. |
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■ FRANK W. MURPHY FRANCE | |||||
Printed in U.S.A. | tel. +33 1 30 762626 fax +33 1 30 763989 |
■ MURPHY DE MEXICO, S.A. DE C.V. | ■ MURPHY SWITCH OF CALIFORNIA | |
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje | 41343 12th Street West | |
San Luis Potosí, S.L.P.; México 78384 | Palmdale, California | |
tel. | tel. (661) | |
■ FRANK W. MURPHY PTE., LTD. | http://www.murphyswitch.com | |
■ MACQUARRIE CORPORATION | ||
No. 2 Tuas South Street 2, | ||
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