Murphy Selectronic SS300 Series 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 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
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.
SPEED SWITCH
1
PICKUP
INPUT
-BATT
+BATT
GND. FOR
T/D
POS. TO
LATCH
ENERGIZE
SPEED
ADJ.
DE-ENERGIZE
2
3
4
5
6
7
8
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

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.
Battery
Magnetic Pickup
+--
Ignition
Switch
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
Ignition
Switch
Fuel
Solenoid
Speed
Signal
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
Ignition
Switch
Energize to stop
Solenoid
Speed
Signal
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
To Alternator
Tach. Terminal
Ignition
Switch
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
Ignition
Switch
+--
Coil
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
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.
2-1/2 in.
(64 mm)
2 in.
(51 mm)
3/16 in. (5 mm)
dia. two places 2-1/16 in.
(52 mm)
1-1/32 in.
(26 mm)
3 in.
(76 mm)
SS300 Series
(all models)

SS-97028N page 3 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.
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.
Dual Set Point Oil Pressure Switch
A dual set point oil pressure switch is shown in Figure 8.
SS300 with AT-67207
Throttle Controller
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.
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.
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Battery
Air Shutoff
Energized to
Close
Speed
Signal
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
Fuse
Oil
Pressure Water
Temperature
Fuel
Solenoid
518PH
TATTLETALE®
Speed
Signal
G
B
NC
SW1 SW2
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
Speed Signal
To alarm or
shutdown
Circuit
On - Off
Switch
N.C.
N.O.
C
+--
SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
AT-67207
Battery
Slow
Fast
Speed
Signal
Pressure
SWICHGAGE®
+-- SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
Battery
CO-3
Common
Disengage
Engage 1
2
3
4
5
Speed
Signal
+-- SS300
4 INPUT
3
2
1
5 – BATT.
6 + BATT.
7
8
SPEED
GND. FOR
T/D
POS. TO
LATCH
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.

SS-97028N page 4 of 4
SPEED SETTING ADJUSTMENT
For Models SS300 and SS300-LF
NOTE: The adjustment control(s) is a 20-turn potentiometer(s) and
have no stops when the extreme settings are reached. Always turn a
full 20 turns.
1. Make sure the PICKUP LED light is “ON”. The PICKUP LED will
be flashing for a low frequency (under 30 Hz) and will remain “ON”
for a higher frequency.
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).
For Models SS300-AD and SS300-AD-LF
1. Make sure the PICKUP LED light is “ON”. The PICKUP LED will be
flashing for low frequency (under 30 Hz) and will remain “ON” for a
high frequency.
2. Turn the SPEED ADJUST pot fully clockwise 20 turns (Figure 14).
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
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).
ENERGIZE
SPEED
PICKUP
LED
Lights
20 turn
potentiometers
SPEED
ADJ.
DE-ENERGIZE
Figure 13 Figure 14
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]
e-mail [email protected]
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [email protected]
www.murphymex.com.mx
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [email protected]
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [email protected]
www.murphyswitch.com
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.
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
[phone] fax [phone]
e-mail [email protected]
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]
fax [phone]
e-mail [email protected]
www.fwmurphy.com
R
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USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product.
A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm