Murphy Keystart 9700 Control Outputs, Fault protection and Alarm System, Charge Fail Warning

Control Outputs

The following are provided:-

Rear Facia Settings & Electrical Connection

∙Switched +ve RUN relay and START outputs, used for controlling the engine fuel and starter motor circuits.

∙A –ve DC (open collector transistor), common ALARM output, used for remotely signalling a fault condition.

Fault protection and Alarm System

After the operator has started the engine and the fault override timer has expired, the Keystart monitors for engine and plant faults through remotely connected switch sensors.

Dedicated inputs are provided for Low Oil Pressure and High Engine Temperature switch sensors. 1 or 2 additional inputs may be used for general purpose ‘plant fail’ contacts. Switches at the rear allow the inputs to be configured for use with remote contacts which either open or close during fault, with wiring polarity to either +ve or –ve DC.

The Keystart may optionally be fitted with an engine overspeed trip, available in alternator sensing (generator AC, 50/60Hz) or magnetic pickup sensing variants.

+ve –ve

VR1

VR2

VR3

Tachometer/calibration output:–

0 – 1mA into 75 meter

VR1: Nominal speed calibration:–

With engine running at normal speed, adjust VR1 until calibration meter reads 0.75mA.

VR2: Overspeed trip level:–

100 - 130% of nominal calibrated speed, clockwise to increase

VR3: Fault override timer:–

<10 to > 30 seconds clockwise to increase

Switch Settings (N.B. = up = down)

S1	Fault Inputs:–	S2	S3	S4
Not				Supply:–
Used	closed –ve			12 V DC
	closed +ve			24 V DC
	open –ve
	open +ve

If any of the above faults occur, Keystart will:-

∙turn off its RUN output (stopping the engine)

∙indicate the fault on the appropriate front facia LED

∙activate its Alarm output (to remotely signal that a fault has occurred).

The automatic fault shutdowns operate on a first-up and latching basis - subsequent faults are not indicated and the displayed fault can only be cleared by switching the Keystart to STOP.

Charge Fail Warning

A charge failure warning LED is provided for use with an

1– ve DC power supply

2Charge fail input

3 +ve DC power supply

4Aux. input ('A' option)

5Mag. pickup input (KEY9701 only)

6Alarm output: –ve DC, < 250mA

7- No connection -

8- No connection -

9- No connection -

10- No connection -

11- No connection -

12- No connection -

13- No connection -

14- No connection -

15Aux./preheat output: +ve DC ('A' option only)

16	Input 1: Low Oil Pressure
17	Input 2: High Engine Temp.
18	Input 3: Plant Fail (9700 only)
19	Input 4: Plant Fail

20- No connection -

22Fuel output: + ve DC, 16A max.

23Start output: + ve DC, 15A max.

24- No connection -

25- No connection -

26- No connection -

27- No connection -

28- No connection -

29L Generator AC: 90 - 300 VAC

30N (KEY9702 only)

engine driven charge alternator. The charge alternator’s WL terminal is connected to the Keystart, which will in turn monitor the WL voltage and provide the alternator with excitation current at engine start up.

Note:–

Pin 5 is not used on models 9700 and 9702.

Pin 18 is not used on overspeed models 9701 and 9702. Pins 29 and 30 are not used on models 9700 and 9701.

Installation

The Keystart uses a DIN standard 96 x 96 mm casing, designed for mounting in a control panel cut-out (92 x 92mm DIN). Electrical connection is through a pair of ‘two-part’ type terminal blocks at the rear of the unit, with 2 separate ¼” blade terminals on overspeed versions for the tachometer or calibration meter.

Also at the rear is are 4 switches for the setting of the supply voltage and alarm input configurations, and up to 3 potentiometers: one to set the fault ‘override’ time (all units), and 2 more to set the speed calibration and overspeed trip level, where fitted.

When ordering, please specify:–

a) Base unit type:-

Keystart 9700: no overspeed

Keystart 9701: magnetic pickup sensing overspeed

Keystart 9702: AC alternator (50/60Hz) overspeed

b) Options:-

‘A’: auxiliary control/preheat option

N.B: stock units are supplied with switch settings for 24VDC power supply, inputs closing to –ve DC during fault.

Typical Connection Circuit

+ VE DC

	Emergency
		Stop				RAL	alarm
	Generator AC
	(KEY9702 only)	29	3		6
	L					(’A’ option only)
	N	30			15
				Aux
+		Start			15	Remote
						Start
	WL			Stop
		2
				Run		Run
–	Magnetic pickup				4
	(KEY9701 only)					Start
		5		RUN	22
		16
	LOP	17			23	RFL	fuel
		19
	HET	+	–	1		RST	starter
	Fail					RPH	preheat
							(’A’ option
	Plant
		RPM/Calib.					only)
		Meter

– VE DC

Since 1939

Frank W. Murphy Manufacturer

PO Box 470248, Tulsa, Oklahoma 74147, USA Tel: + 1 918 627 3550 Fax: + 1 918 664 6146 email: sales@fwmurphy.com

web: http://www.fwmurphy.com

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