Murphy HD9063 Series Crank Disconnect Relay, Overspeed and Underspeed Relay, Mounting

MOUNTING DIMENSIONS

HD9063 and HD9063-USOS

4 in. (102 mm) Mounting Holes

2-1/4 in.

(57 mm) Mounting Holes

	RE A	SE		RE A	SE
	C			C
I	N		I	N

CRANK

OVERSPEED

DISCONNECT

EXT.

MAG.

PICKUP

INTERNAL

NC

EXT.

NC

CRANK

NO

TEST

NO

INTERNAL

DISCONNECT

EXT.

OVERSPEED

RELAY

C

C

RELAY

CONTACTS

POWER

CONTACTS

(+) ( ) (+) ( )

1

2

3

4

5

6

7

8

9

10 11 12

2-3/4 in.

(70 mm)

Mounting

Standoffs

4 Places

4-1/2 in.

(114 mm)

3/4 in.

(19 mm)

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

Crank Disconnect Relay

An understanding of the crank disconnect function for your par- ticular system is critical to speed switch installation. It is also important to consider the 5 A current limitation of K1 relay con- tacts. 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 func- tion 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 shut- down is to be initiated by removal of battery voltage.

Crank

Disconnect Relay

K1

Underspeed Relay K1			Overspeed Relay K2
	NO	NC		NO	NC	Contact opens on overspeed or
1	2	3	1	2	3	underspeed and drops out solenoid.

1	2	Battery
		3
Crank		Starter
Enable		Pilot Relay
Battery		To
		Starter Solenoid

Figure 1

Battery

Energize

Off

NO

Start

Starter

Switch

Starter Contactor

Relay

OPTIONAL

Hold

Energize

Starter

Figure 2

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