Murphy HD9063 User Manual

HD-96044N page 1 of 4

Installation and Operation Instructions for
Dual Set Point Speed Switch

HD9063 Series

HD-96044N

Revised 03-01

Section 20

(00-02-0179)

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.

Description

The HD9063 Series is a unitized two set point speed switch with
SPDT relay outputs. HD9063 is a PC-board configuration with
standoffs for mounting in a control panel or cabinet.

Models are available for crank disconnect/overspeed and for
underspeed/overspeed applications. Trip points can be field
adjusted on all models. LED’s next to the set point potentiometers
indicate that the trip point has been reached and the relay(s) have
operated. An overspeed test circuit is built-in; it will actuate the
output relay at a point below actual overspeed set point.

The HD9063 can disconnect the starter on automatic start engine
applications and shutdown the engine if an overspeed situation
occurs. Re-engagement of the starter is inhibited until RPM
returns virtually to zero.

HD9063-USOS models allow operation of control circuits
according to the speed of the driver or as a pre-alarm.
Two separate adjustable speed switches are included on one
common board.

Specifications

Power Supply:

Voltage: 8-30 VDC
Maximum Current: 150 mA

Frequency Signal:

Voltage, Magnetic Pickup Signal Models

•

Minimum: 0.35 Vrms

•

Maximum: 60 Vrms
Maximum Current, Magnetic Pickup Signal Models: 4.8 µA.
Adjustment Range, Magnetic Pickup Signal Models

•

HD9063 Model

Crank Disconnect: 250-6,000 Hz
Overspeed: 1,100-10,000 Hz

•

HD9063-USOS Model

Underspeed: 200-5,800 Hz
Overspeed: 1,100-10,000 Hz

Reset Differential, Magnetic Pickup Signal Models

•

HD9063 Model

Crank Disconnect: Dropout 160 Hz ± 5%
Overspeed: 200 Hz Differential

•

HD9063-USOS Model

Underspeed: +5% of Set point Differential
Overspeed: 155 Hz ± 10% Differential

Output: Relay Contact, SPDT, Resistive Load: (2) 5 A, 30 VDC

Adjustment: (2) 270°–turn potentiometer

Temperature Range: 14 to 158°F (-10 to 70°C)

WARNING

HD-96044N page 2 of 4

Crank Disconnect Relay

An understanding of the crank disconnect function for your par­ticular system is critical to speed switch installation. It is also
important to consider the 5 A current limitation of K1 relay con­tacts. Figure 1 illustrates the use of a low-current pilot relay to
operate the high-current starter solenoid. In operation, battery
voltage is supplied through the normally closed contacts of the
speed switch crank disconnect relay K1. When the engine starts,
K1 energizes and its normally closed contacts open. This action
de-energizes the pilot relay and inhibits the starter from operating
until the engine nearly stops. The normally open contacts may be
used if a contact closure is required to disable the cranking func­tion for your system.

Overspeed and Underspeed Relay

NOTE: Underspeed relay available on HD9063-USOS only.

The overspeed and underspeed functions of the speed switch may
be used in various systems to effect engine shutdown or actuate an
alarm in the event of engine overspeed or underspeed. Figure 2
illustrates the overspeed/underspeed function being used to control
a fuel rack solenoid. In this application, battery voltage is available
to the solenoid through normally open contacts of the relay (K2
overspeed) (K1 underspeed). If the engine speed exceeds the nor-
mal overspeed or underspeed set point, relay K1 or K2 energizes
and this voltage energizes the solenoid, shutting down the engine.
Similarly, the normally closed contacts may be used if engine shut­down is to be initiated by removal of battery voltage.

HD9063 and HD9063-USOS

1

Overspeed Relay K2

Contact opens on overspeed or
underspeed and drops out solenoid.

OPTIONAL

Energize

NO

Off

Start

NO NC

2 31

Underspeed Relay K1

NO NC

2 3

Battery

Starter
Switch

Starter Contactor

Relay

Starter

Energize

Hold

MOUNTING DIMENSIONS

Figure 1

Figure 2

Mounting

1. Drill four 3/16 in. (5 mm) diameter mounting holes (refer to

mounting hole dimensions above).

2. Align the plastic standoffs on the HD9063 with the 4 mounting

holes and push gently until standoffs snap into place.

CAUTION: Pushing too hard could damage board.

Mounting

1. Drill four 1/4 in. (6 mm) diameter mounting holes (refer to mount-

ing hole dimensions above).

2. Secure with four 10-32 screws.

RELAY FUNCTIONS

4 in. (102 mm)

Mounting Holes

2-1/4 in.
(57 mm)

Mounting

Holes

INTERNAL

CRANK

DISCONNECT

RELAY

CONTACTS

E

A

R

C

N

I

CRANK

DISCONNECT

NC

NO

EXT.

C

POWER

(+) (+)( ) ( )

123456789101112

S

E

OVERSPEED

EXT.
MAG.

PICKUP

EXT.
TEST

E

A

R

S

C

E

N

I

NC

NO

C

INTERNAL

OVERSPEED

RELAY

CONTACTS

2-3/4 in.
(70 mm)

Mounting
Standoffs
4 Places

4-1/2 in.

(114 mm)

3/4 in.

(19 mm)

Crank

Enable

Battery

Crank

Disconnect Relay

K1

321

Starter Solenoid

Battery

Starter
Pilot Relay

To

HD-96044N page 3 of 4

CAUTION: PERFORM THE WIRING OPERATION WITH THE POWER SOURCE “OFF”

MAGNETIC PICKUP INSTALLATION

A magnetic pickup is an AC generator. It is normally installed
into the flywheel housing of an internal combustion engine, so
that the starter ring gear acts upon it to generate a voltage pulse
each time a gear tooth passes the end of the sensor.

Magnetic Pickup Installation (see Figure 5)
Drill and tap a hole in the flywheel housing (See Specifications

Chart below for model and thread size). IMPORTANT: Drilling
too deep may damage ring gear teeth. Blow chips with air hose
when drilling and tapping hole.

Gap Adjustment

Insert magnetic pickup and turn until it stops at the face of the gear.
Back-off the gear by turning the pickup counterclock­wise

1/4, 1/2, or 3/4 turn (Figure 4)

.

See Gap Chart (above, right) to determine gap
distance based on the turn. Check gap clear­ance by rotating the gear completely around.

NOTE: Magnetic pickup gap should be
adjusted so that the minimum voltage required
is attained at the engine’s lowest RPM. The
voltage will increase as the speed increases.

If erratic readings occur, remove magnetic
pickup and check the magnetic tip for metal chips.

Murphy Magnetic Pickup Specifications Chart

Pickup Total Threaded Thread
Model Length Length Size

MP3298* 3 in. (76 mm) 3 in. (76 mm) 5/8-18 UNF

MP7906

†

3 in. (76 mm) 3 in. (76 mm) 3/4-16 UNF

MP7905

††

4-1/2 in. (114 mm) 4-1/2 in. (114 mm) 3/4-16 UNF

*

Replaces 20-01-0080 and MP100. Lead wire hookup (12 in. [305 mm]).

†

Replaces 20-01-0081. Lead wire hookup (12 in. [305 mm]).

††

Replaces 20-01-0082. Lead wire hookup (12 in. [305 mm]).

Gap Chart

1. Connect terminal 5 on the HD9063 to engine ground and

connect terminal 4 to battery positive (see Figure 3).

2. Connect the magnetic pickup cable conductors to terminals

6 and 7.

3. If cable is shielded, connect shield to engine chassis ground.

4. If desired, connect a normally open test push button switch

between terminals 8 and 9.

5. Connect crank disconnect circuit to crank disconnect termi-

nals 1 thru 3 as discussed in Crank Disconnect Relay
Function, page 2. On HD9063-USOS models connect the
overspeed circuits 1 thru 3 as discussed in Overspeed Relay
and Underspeed Relay Function, page 2.

6. Connect the overspeed circuits to overspeed terminals 10 thru

12 as discussed in Overspeed Relay and Underspeed Relay
Function, page 2.

WIRING

123456789101112

(+) (+)( ) ( )

K1 K2

12

Common Common

Normally Open Normally Open

Normally Closed Normally Closed

Test

Pushbutton

DC Positive

DC Negative
(Engine Ground)

From Magnetic Pickup

To Engine

Crank Control

Circuit

or

to Shutdown

Circuits

(HD9063-USOS)

To
Shutdown
Circuits

THREAD

SIZE

5/8-18 UNF

3/4-16 UNF

1/4

1/2

3/4 1

GAP

.013 in. .028 in. .035 in. .055 in.

(0.33 mm) (0.71 mm) (0.88 mm) (1.39 mm)

.015 in. .030 in. .045 in. .062 in.

(0.38 mm) (0.76 mm) (1.14 mm) (1.57 mm)

TURN

1/4

1/2 3/4

AC

Meter

After adjusting,
set locknut.

Drill and tap casing
(see thread sizes in
Specifications).

Casing

Gear (must be made
of magnetic material).

NOTE: Clean gear casing
and magnetic sensor
of metal chips or filings.

Gap

(see Gap Chart)

Always use a two-conductor shielded cable. Ground the
shield to a metal frame ground at the engine end only.

Never run these wires
next to spark plug wires
or in wire loom with other
wires carrying inductive
loads or alternating current.

Figure 3

Figure 4

Figure 5

HD-96044N page 4 of 4

ADJUSTING THE SPEED SWITCH

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 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.

Overspeed and Underspeed
Set Point Adjustment

OVERSPEED

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.

UNDERSPEED

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.

Figure 6

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

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

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 [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
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 [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

www.fwmurphy.com

R

E

G

I

S

T

E

R

E

D

USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A.

Crank Disconnect
Potentiometer

Crank
Disconnect
or
Underspeed
LED

Underspeed Potentiometer

or

(HD9063-USOS)

E

A

R

S

C

E

N

I

EXT.
MAG.

NC

NO

C

PICKUP

EXT.

POWER

(+) (+)( ) ( )

123456789101112

EXT.
TEST

Overspeed Potentiometer

E

A

R

S

C

E

N

I

NC

NO

C

Overspeed
LED