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Adjustment of the Dual Set point Speed Switch is performed
when the system is otherwise operational in all respects.
See Figure 6 for location of Crank Disconnect, Underspeed and
Overspeed potentiometers.
Crank Disconnect
Underspeed Potentiometer
or
Potentiometer
(HD9063-USOS)
Crank
Disconnect
or
Underspeed
NC
LED
NO
C
1 2 3 4 5 6 7 8 9 10 11 12
Crank Disconnect Set Point Adjustment
1. If engine serves as a backup for an electric pump or other
motor driven device, turn off the associated electric motor.
2. Reset any associated switches.
3. Ground engine ignition system or shut off fuel to engine to dis-
able engine from starting.
4. Loosen locknut on Crank Disconnect set point potentiometer
and turn potentiometer fully clockwise.
5. Operate electrical switch(es) as appropriate so that engine will
begin to crank.
6. While engine is cranking, slowly turn Crank Disconnect Set
point potentiometer counterclockwise until Crank Disconnect
LED lights (Figure 6). Engine should stop cranking.
7. Now turn the potentiometer clockwise 1/16 turn.
8. Enable engine and allow it to start, verifying that starter disengages.
If starter motor stays engaged too long, lower set point slightly
by turning potentiometer counterclockwise in increments of no
more than 1/16 turn. Re-test after each adjustment by starting
engine, and continue adjustment until starter disconnects as
soon as engine starts.
If starter motor does not stay engaged long enough, raise set
point slightly by turning potentiometer clockwise in increments
of 1/16 turn. Re-test after each adjustment.
9. Tighten locknut on Crank Disconnect set point potentiometer.
NOTE: A starter protection feature prevents starter from being
engaged until engine almost completely stops after running.
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax +1 918 317 4266
e-mail sales@fwmurphy.com
www.fwmurphy.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.
ADJUSTING THE SPEED SWITCH
Overspeed Potentiometer
Overspeed
LED
EXT.
MAG.
PICKUP
EXT.
NC
TEST
NO
EXT.
C
POWER
(+)
( )
(+)
( )
Figure 6
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
+1 281 633 4500 fax +1 281 633 4588
e-mail sales@fwmurphy.com
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
e-mail ventas@murphymex.com.mx
www.murphymex.com.mx
Overspeed and Underspeed
Set Point Adjustment
O
VERSPEED
1. Loosen locknut on Overspeed set point potentiometer and turn
potentiometer fully clockwise.
2. Start engine and run at highest normal operating RPM.
3. Slowly turn Overspeed adjustment potentiometer counter-
clockwise until overspeed switch trips or engine shuts down.
The LED light should flash.
4. Turn potentiometer approximately 2° clockwise, then
tighten locknut.
5. Reset switches as applicable and restart engine.
NOTE: An overspeed test switch connected as shown in Figure 3
provides a means for decreasing set point for test purposes.
6. If a test push button is installed, press push button and verify
that overspeed LED (Figure 6) flashes and engine shuts down
or switch trips.
U
NDERSPEED
NOTE: Underspeed is available on HD9063-USOS models only.
1. Loosen locknut on Underspeed set point potentiometer and turn
potentiometer fully counterclockwise.
2. Start engine and run at lowest normal operating RPM.
3. Slowly turn Underspeed adjustment potentiometer clockwise
until underspeed switch trips or engine shuts down. The LED
light should flash.
4. Turn potentiometer approximately 2° counterclockwise, then
tighten locknut.
5. Reset switches as applicable and restart engine.
NOTE: An overspeed test switch connected as shown in Figure 3
provides a means for decreasing set point for test purposes.
6. If overspeed test push button is installed, press push button and
verify that overspeed LED (Figure 6) flashes and engine shuts
down or switch trips.
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
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055 fax +44 1722 410088
e-mail sales@fwmurphy.co.uk
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700 fax +1 661 947 7570
e-mail sales@murphyswitch.com
www.murphyswitch.com
HD-96044N page 4 of 4
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax +61 3 9358 5558
e-mail murphy@macquarrie.com.au
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.
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