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