Murphy Selectronic SS300 Series - Manual (Page 3)

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.