Murphy SS300 User Manual
SS-97028N page 1 of 4
Installation and Operation Instructions for
SELECTRONIC
®
Speed Switches
SS300 Series
SS-97028N
Revised 05-04
Section 20
00-02-0286
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
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.
SS300-AD
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.
The SS300 Series speed switch is intended for installation within a weatherproof
enclosure to protect it from rain, dust, etc.
Overspeed Shutdown
The SS300 Series shuts down the engine if RPM exceeds the pre-set limit.
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.
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.
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.
Table 1: Models Available and Input Signal
Specifications
Power Requirements:
12 VDC (9-16 VDC).
24 VDC (18-30 VDC).
Frequency Signal: Voltage (all models):
• Minimum Input Voltage Signal: 4.5 Vrms.
• Maximum Input Voltage Signal: 50 Vrms.
Reset Differential Magnetic Pickup Signal Models:
•
“Standard Models: 2 Hz Differential.
•
“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.
Output: Relay contact, SPDT, resistive load, 6 A, 30 VDC.
Time Delay: When terminal 7 is grounded, the relay operation is delayed for
2-6 seconds after rpm set point is reached.
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.
Model Number
Distributor
Ignition
Magnetic
Pickup
Alternator
SS300 (std. model) ✗✗✗
SS300-LF (low frequency) ✗✗✗✗
SS300-AD (adjustable differential) ✗✗✗
SS300-AD-LF (low frq. & Adjst. diff.) ✗✗✗✗
Voltage
12 24
Maximum Current 12V 24V
Pull In 46 mA 46 mA
Pickup only 10.5 mA 16 mA
Frequency Range in Hz Model Number
25-2000 SS300-LF
SS300-AD-LF
625-9000 SS300-AD
SS300
SPEED SWITCH
WARNING
1
2
3
INPUT
4
-BATT
5
+BATT
6
GND. FOR
7
POS. TO
8
LATCH
PICKUP
ENERGIZE
SPEED
ADJ.
T/D
DE-ENERGIZE
SS-97028N page 2 of 4
MOUNTING DIMENSIONS
The SS300 Series models can be mounted to a flat surface within
the panel using two #8 screws. Mounting screws are not supplied.
TYPICAL WIRING INSTALLATION
CAUTION:
BEFORE PERFORMING THE WIRING OPERATION TURN THE POWER SOURCE
OFF AND STOP YOUR ENGINE.
CAUTION:
THE SS300 SERIES MODELS ARE INTENDED FOR INSTALLATION WITHIN A WEATHER-
PROOF ENCLOSURE.
Figure 1:
Magnetic Pickup Input
Figure 2:
Alternator Tach., Input
Figure 3:
Distributor Ignition Input
Figure 5:
Energize to Stop Solenoid
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.
Figure 4:
Energize to Run Solenoid
Frequency/RPM Input Source
Connect the SS300 Series speed switch to the appropriate frequency/RPM
input source. See Figures 1 thru 3.
Latching Overspeed with Fuel Solenoid
A latching overspeed switch with fuel solenoid application is shown in
Figures 4 and 5. Ignition switch must be turned off to unlatch.
SS300 Series
(all models)
3/16 in. (5 mm)
dia. two places
SPEED
1
2
Magnetic Pickup
+--
Battery
Ignition
Switch
3
4 INPUT
5 – BATT.
6 + BATT.
GND. FOR
7
T/D
POS. TO
8
LATCH
SS300
1-1/32 in.
(26 mm)
2-1/2 in.
(64 mm)
3 in.
(76 mm)
2 in.
(51 mm)
2-1/16 in.
(52 mm)
To Alternator
Tach. Terminal
+--
Battery
--
+
Coil
+--
Battery
1
2
3
4 INPUT
5 – BATT.
Ignition
Switch
6 + BATT.
7
8
1
2
3
4 INPUT
5 – BATT.
6 + BATT.
7
Ignition
Switch
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
SS300
SPEED
GND. FOR
T/D
POS. TO
LATCH
SS300
Speed
Signal
Fuel
Solenoid
Battery
Energize to stop
Solenoid
Speed
Signal
Battery
SPEED
1
2
3
4 INPUT
5 – BATT.
6 + BATT.
GND. FOR
7
T/D
POS. TO
8
Ignition
+--
Switch
LATCH
SS300
SPEED
1
2
3
4 INPUT
5 – BATT.
6 + BATT.
GND. FOR
7
T/D
POS. TO
8
Ignition
+--
Switch
LATCH
SS300
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