Murphy Plumbing Product OS77 Series User Manual

OS-98001N  
Effective 04-98  
Section 20  
OS77 Series Single Set Point Switch  
Installation and Operation Instructions  
00-02-0303  
®
FRANK W.  
MFR.  
Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended  
before mounting. It is your responsibility to have a qualified person install this unit and make sure it conforms to NEC and local codes.  
GENERAL INFORMATION  
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.  
OS77 Series  
Description  
OS77 Module Dimensions  
The OS77 Series single set point speed switch is a compact, all-electronic,  
speed sensing module. It is field adjustable and can be panel mounted via its  
trip set point potentiometer.  
Speed Adj.  
Potentiometer  
2-1/2 in.  
(64 mm)  
2-3/8 in.  
(60 mm)  
Standard OS77 models provide a transistor output when tripped. Models with a  
relay output are available.  
The OS77 is used for protecting the engine from excessive or insufficient oper-  
ating speeds. As the engine speed reaches the adjustable set point setting, the  
OS77 will cause the engine to shutdown.  
Models are available with Normally Open or Normally Closed circuit and  
available recrank feature which inhibits starter re-engagement until the engine  
speed is near zero RPM.  
2-1/8 in.  
(54 mm)  
1
2
3
4
5
Mounting Schematic  
Specifications  
Polycarbonate  
enclosure  
Positioning  
post  
Power Supply: Voltage: 7-28 VDC.  
Maximum Current: 100 mA.  
Frequency Signal:  
Mounting  
Hardware  
Voltage, Magnetic Pickup Signal Models  
Minimum: 1.2 Vrms  
Maximum: 30 Vrms  
Potentiometer  
Locknut  
Panel  
Voltage, Distributor Ignition Models  
Minimum: 6 Vrms  
Maximum: 30 Vrms  
Speed Adj.  
Potentiometer  
Terminal #5 used for  
Relay output models  
Maximum Current, Magnetic Pickup Signal Models: 0.12 mA  
Maximum Current, Distributor Ignition Models: 0.12 mA  
Adjustment Range, Magnetic Pickup Signal Models: 1000-10,000 Hz  
Adjustment Range, Distributor Ignition Models: 40-400 Hz  
Reset Differential, Magnetic Pickup Signal Models  
Mounting Instructions  
The OS77 module is designed to be mounted in a flat panel.  
1. Drill the mounting holes as shown on the template included with the packing.  
2. Insert the module from the back side of the panel (refer to schematic above).  
3. Secure the OS77 module using the mounting hardware included.  
Non-recrank model: 10 Hz Differential  
Recrank model: dropout 54 Hz  
Reset Differential, Distributor Ignition Models  
Installation Accessories  
Non-recrank model: 10 Hz Differential  
Recrank model: dropout 2.4 Hz  
Hardware tools and optional equipment needed to install the OS77:  
Tools as needed for system mounting such as drill and screw driver  
Output:  
18 AWG wire for extension and hook up  
Transistor Sink to Ground Resistive Load: 2 A, 28 VDC  
Relay Output Models: 5 A, 250 VAC  
Wire termination tools and ring or spade wire termination.  
Voltmeter or test lamp for set up and adjustments.  
Adjustment: 270°–turn potentiometer  
Temperature Range: -13° to 185°F (-25° to 85°C)  
 

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