Murphy OS-77R Manuel utilisateur

GENERAL INFORMATION AND MOUNTING DIRECTIONS

OS77R-OS.PM5

EFFECTIVE: 12/93

Model OS-77R

Model OS-77R-I

Overspeed Speed Switch With Relay Output

WARNING

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

Disconnect all electrical power to the machine.

Make sure the machine cannot operate during installation.

Follow all safety warnings of the machine manufacturer.

Read and follow all installation instructions.

Installation Accessories

Hardware, tools, and optional equipment needed to in-

stall the model OS77R.

■Tools as needed for the system mounting, such as

drill and screw driver.

■18 ga. wire for extension and hook up.

■Set of wire terminating tools.

■Wire termination; such as ring or spade terminals.

DESCRIPTION

The OS77R is an Overspeed Shutdown Switch used

for protecting the engine from excessive operating speeds.

The unit monitors a frequency generated from a magnetic

pickup. The OS77R-I functions identically to the OS77R

but monitors engine speed from a distributor ignition.

If the unit senses an engine speed higher than the ad-

justable set point, the unit will cause the engine to shut

down.

SETTING THE MODEL OS77R SERIES

IMPORTANT: The the following instructions as-

sume terminal number 5 is grounded. Please refer to

wiring and mounting information before attempting to ad-

just the unit. These steps must be done before the fine

tuning can be accomplished. The following steps should

be followed for first time setup of unit.

A. Turn “OVERSPEED ADJ.” fully clockwise.

B. Remove the wire from terminal # 2 of the OS77R.

C. Start engine and run at the highest RPM desired.

This is the RPM at which the engine should be

shut down if exceeded.

D. Connect a Voltmeter (or test light) between Termi-

nal #1 (positive +) and Terminal # 2 (negative -) of

the OS77R. You should read “no voltage” (test

lamp will be OFF.)

E. Slowlyturn“OVERSPEEDADJ.”counter-clockwise

and STOP the INSTANT battery voltage is indi-

catedon the voltmeter(or the testlight comes ON.)

F. Slowly turn “OVERSPEED ADJ.” clockwise about

1/8 of an inch. Now, tighten the locknut on the

“OVERSPEEDADJ.”without disturbingthesetting.

G. Re-connect the wire to Terminal #2 on the OS77R.

This reconnects the OVERSPEED shutdown cir-

cuitry.

NOTE: If further adjustment is needed;

Turning the “OVERSPEED ADJ.” clockwise,

RAISES the shutdown point. This allows the en-

gine to run at a HIGHER RPM.

Turning the “OVERSPEED ADJ.” counter-clock-

wise LOWERS the shutdown point. This will shut

down the engine at a LOWER RPM.

NOTE: Relay contacts are between terminals 2 and 5.

WARNING:Performthe mounting operationwith

power source off. The OS77R module is de-

signed to be mounted in a flat panel. First, drill

the mounting holes as shown on the template

includedwiththe packing. Insert themodulefrom

the back side of the panel and install mounting

hardware.

WIRING INSTRUCTIONS

CSB

OS77R

BATTERY

SPECIFY

VOLTAGE

STARTER

RACK

PULLER

FUEL

VALVE

HOLD IN

PULL IN

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.

117

1234

5KEY SWITCH

CSB

OS77R 169PH

MAGNETO

BATTERY

SPECIFY

VOLTAGE

321

OS77R USED WITH AN

ENERGIZED TO RUN

(ETR) SOLENOID

Note: For distributor

ignition applications,

you may use a Model

OS77R-I. Simply con-

nect terminal three (3)

to the negative side of

the ignition coil. You

will not need a mag-

netic pickup with the

Model OS77R-1.

OS77R USED TO SHUT

DOWN A MAGNETO

IGNITION ENGINE.

Note: Battery power

must be available. Also

note, a Murphy Model

169 PH magnetic

switch is used in place

of a Model 117.

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