Murphy Switch SS300 Series User Manual

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  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
2
3
4
5
6
7
8
PICKUP  
ENERGIZE  
INPUT  
-BATT  
SPEED  
ADJ.  
+BATT  
Disconnect all electrical power to the machine.  
GND. FOR  
T/D  
Make sure the machine cannot operate during installation.  
Follow all safety warnings of the machine manufacturer.  
Read and follow all installation instructions.  
DE-ENERGIZE  
POS. TO  
LATCH  
Specifications  
Power Requirements:  
12 VDC (9-16 VDC).  
Description  
The SS300 Series are single set point speed switches with SPDT relay dry contact  
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.  
24 VDC (18-30 VDC).  
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  
25-2000  
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.  
SS300-LF  
SS300-AD-LF  
625-9000  
SS300-AD  
SS300  
Reset Differential Magnetic Pickup Signal Models:  
Adjustable Differential Model  
“Standard Models: 2 Hz Differential.  
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):  
50-1900 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  
 
TYPICAL WIRING INSTALLATION (continued)  
Non Latching Overspeed Switch with  
Air Shutoff Solenoid  
A non-latching overspeed switch with air shutoff solenoid application is  
shown in Figure 6. The air shutoff device must be manually reset to  
open/run position.  
CAUTION: If replacing an SS100 Series  
model with an SS300 Series model, note the  
significant wiring differences on the SS300  
terminals: 5, 6, 7, and 8. Wire your SS300 accordingly.  
Air Shutoff  
SPEED  
Energized to  
1
Close  
2
3
Speed  
Signal  
4
5
6
INPUT  
SS300 with AT-67207  
Throttle Controller  
– BATT.  
+ BATT.  
GND. FOR  
T/D  
7
8
The SS300 with the AT-67207 throttle control is used to limit speed as  
shown in Figure 9. Engine speed is controlled by OPL pressure  
SWICHGAGE® setting and the AT-67207 throttle control. The throttle  
control moves as long as OPL contact is made. If OPL is calling for an  
increase in speed and engine speed exceeds the setting of the SS300, a  
slow signal is applied to AT-67207. The throttle control will stop if both  
fast and slow signals are applied. Engine speed at a constant load will  
not exceed the limit set by the SS300.  
POS. TO  
LATCH  
--  
+
Battery  
SS300  
Figure 6  
Non Latching Overspeed Switch with  
518PH and Fuel Solenoid  
A non-latching overspeed switch with an 518PH magnetic switch and a  
fuel solenoid is shown in Figure 7.  
Pressure  
®
SWICHGAGE  
AT-67207  
SPEED  
1
SPEED  
2
3
1
2
518PH  
4
5
6
INPUT  
3
TATTLETALE®  
– BATT.  
+ BATT.  
4
5
6
INPUT  
Speed  
Signal  
Speed  
Signal  
– BATT.  
+ BATT.  
GND. FOR  
T/D  
POS. TO  
LATCH  
7
8
GND. FOR  
T/D  
POS. TO  
LATCH  
7
8
--  
+
Fuel  
SS300  
Battery  
Solenoid  
SS300  
Fuse  
Figure 9  
--  
+
Battery  
SS300-AD with Clutch Engager  
The SS300-AD can be applied with a Murphy CO-3 engager (Figure 10).  
The circuit is designed to engage a clutch after engine speed has increased  
to a preset RPM (Example: 1200 RPM), and disengage clutch when  
engine speed has decreased to idle (Example: 600 RPM). The adjustable  
differential SS300-AD relay is set to pull in at 1200 RPM and drop out at  
600 RPM.  
Oil  
Pressure  
Water  
Temperature  
Figure 7  
Dual Set Point Oil Pressure Switch  
A dual set point oil pressure switch is shown in Figure 8.  
SPEED  
1
To alarm or  
shutdown  
Circuit  
CO-3  
5
4
N.C.  
2
3
4
5
6
SPEED  
1
C
Common 3  
Disengage 2  
INPUT  
2
3
4
5
6
– BATT.  
+ BATT.  
N.O.  
Engage  
1
INPUT  
Speed  
Signal  
GND. FOR  
T/D  
POS. TO  
LATCH  
7
8
– BATT.  
+ BATT.  
Speed Signal  
GND. FOR  
T/D  
POS. TO  
LATCH  
7
8
--  
+
SS300  
Battery  
On - Off  
Switch  
--  
+
Battery  
SS300  
Figure 10  
Figure 8  
SS-97028N page 3 of 4  
 
SPEED SETTING ADJUSTMENT  
For Models SS300 and SS300-LF  
For Models SS300-AD and SS300-AD-LF  
NOTE: The adjustment control(s) is a 20-turn potentiometer(s) and 1. Make sure the PICKUP LED light is “ON”. The PICKUP LED will be  
have no stops when the extreme settings are reached. Always turn a  
full 20 turns.  
flashing for low frequency (under 30 Hz) and will remain “ON” for a  
high frequency.  
1. Make sure the PICKUP LED light is “ON. The PICKUP LED will 2. Turn the SPEED ADJUST pot fully clockwise 20 turns (Figure 14).  
be flashing for a low frequency (under 30 Hz) and will remain “ON”  
for a higher frequency.  
3. Turn the DE-ENERGIZE pot fully counterclockwise 20 turns.  
4. Run the engine at the desired RPM and adjust the SPEED ADJUST pot  
counterclockwise until the ENERGIZE LED comes “ON” and relay  
2. Turn the SPEED ADJUST pot fully clockwise 20 turns (Figure 13).  
3. Run the engine at the desired RPM and adjust the SPEED ADJUST pot  
counterclockwise until the ENERGIZE LED comes “ON” and the  
relay has transferred (Figure 13).  
has transferred.  
5. Reduce the engine speed to the desired drop out point.  
6. Adjust the DE-ENERGIZE pot clockwise until the ENERGIZE LED  
goes “OFF” and the relay has dropped out (Figure 14).  
PICKUP  
LED  
20 turn  
potentiometers  
SPEED  
ADJ.  
Lights  
ENERGIZE  
DE-ENERGIZE  
SPEED  
Figure 14  
Figure 13  
Warranty  
A limited warranty on materials and workmanship is given with this FW Murphy product.  
CONTROL SYSTEMS & SERVICES DIVISION  
P.O. Box 1819; Rosenberg, Texas 77471; USA  
+1 281 633 4500 fax +1 281 633 4588  
FRANK W. MURPHY, LTD.  
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.  
+44 1722 410055 fax +44 1722 410088  
MACQUARRIE CORPORATION  
1620 Hume Highway  
Campbellfield, Vic 3061; Australia  
+61 3 9358 5555 fax +61 3 9358 5558  
FW Murphy  
P.O. Box 470248  
MURPHY DE MEXICO, S.A. DE C.V.  
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje  
San Luis Potosí, S.L.P.; México 78384  
+52 444 8206264 fax +52 444 8206336  
Villahermosa Office +52 993 3162117  
MURPHY SWITCH OF CALIFORNIA  
41343 12th Street West  
Palmdale, California 93551-1442; USA  
+1 661 272 4700 fax +1 661 947 7570  
Tulsa, Oklahoma 74147 USA  
+1 918 317 4100  
fax +1 918 317 4266  
USA–ISO 9001:2000 FM 28221  
UK–ISO 9001:2000 FM 29422  
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.  
Printed in U.S.A.  
SS-97028N page 4 of 4  
 

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