User manual Murphy Selectronic SS300 Series

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SS-97028N  
Revised 05-04  
Section 20  
Installation and Operation Instructions for  
00-02-0286  
®
SELECTRONIC Speed Switches  
SS300 Series  
Please read the following information before installing. A visual inspection of this product for damage during shipping is rec-  
ommended 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  
SS300-AD  
SPEED SWITCH  
1
WARNING  
2
3
4
PICKUP  
ENERGIZE  
INPUT  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
5 -BATT  
SPEED  
ADJ.  
6
7
8
+BATT  
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.  
GND. FOR  
T/D  
DE-ENERGIZE  
POS. TO  
LATCH  
Description  
Specifications  
The SS300 Series are single set point speed switches with SPDT relay dry contact Power Requirements:  
1
2 VDC (9-16 VDC).  
4 VDC (18-30 VDC).  
output. The trip point is set by a potentiometer. An LED indicates when the signal  
source is present. A second LED turns on when the trip point is reached. See Table 1  
for available models and requirements. An optional time delay is on board to delay  
operation of the relay for 2-6 seconds after the set point has been reached.  
2
Frequency Signal: Voltage (all models):  
Minimum Input Voltage Signal: 4.5 Vrms.  
Maximum Input Voltage Signal: 50 Vrms.  
The SS300 Series speed switch is intended for installation within a weatherproof  
enclosure to protect it from rain, dust, etc.  
Maximum Current  
Pull In  
12V  
24V  
Overspeed Shutdown  
46 mA  
46 mA  
The SS300 Series shuts down the engine if RPM exceeds the pre-set limit.  
Pickup only  
10.5 mA  
16 mA  
Speed Sensitive Pull-in/Drop-out  
Engage or disengage PTO’s, 4-wheel drives, other switch points, etc. according  
to speed of engine being monitored.  
Frequency Range in Hz  
Model Number  
Engine and Transmission Alarm/Shutdowns  
Oil pressure in some engines and transmissions varies widely between running  
and idle speeds. The SS300 Series can select between two pressure switch set  
points according to speed of the engine or transmission and thus give maximum  
protection to the equipment while at operating RPM and eliminate nuisance  
alarms when at idle.  
2
5-2000  
SS300-LF  
SS300-AD-LF  
625-9000  
SS300-AD  
SS300  
Reset Differential Magnetic Pickup Signal Models:  
“Standard Models: 2 Hz Differential.  
Adjustable Differential Model  
The (“AD”) can be adjusted to change the speed range over which the pull-in and  
drop-out differential of the relay will operate. A typical application is to insure  
that engine speed is above a minimum RPM before applying a load but allows a  
drop in speed of several hundred RPM without disconnecting the load.  
“AD” Models (Adjustable Differential): 650-8900 Hz Adjustable  
Reset Differential Alternator Models:  
“LF” Models (Low Frequency): 2 Hz Differential  
“AD-LF” Models (Adjustable Differential Low Frequency):  
5
0-1900 Hz Adjustable.  
Table 1: Models Available and Input Signal  
Output: Relay contact, SPDT, resistive load, 6 A, 30 VDC.  
Distributor Magnetic  
Voltage  
12 24  
Time Delay: When terminal 7 is grounded, the relay operation is delayed for  
Model Number  
Alternator  
Ignition  
Pickup  
2
-6 seconds after rpm set point is reached.  
SS300 (std. model)  
Adjustment: 20–turn potentiometer(s).  
Temperature Range: -4° to 185°F (-20° to 85°C).  
Relative Humidity: 0 to 95% Non-condensing.  
Case: Black, ABS plastic.  
SS300-LF (low frequency)  
SS300-AD (adjustable differential)  
SS300-AD-LF (low frq. & Adjst. diff.)  
SS-97028N page 1 of 4  

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