Murphy A900 Series manual Fuel Relay

	Figure 4-4.1.3
			Fuel Relay
Torque								Torque
Scews to							Scews to
12 In./lb.								12 In./lb.
15			Crank Relay					35
26							SW1 = 1	36
							SW2 = 2
							SW3 = 3
04	Crank/Rest			Number			SW4 = 4	37
	Time			of Cranks			SW5 = 5
	SW1 = 10 s.						SW6
	SW2 = 15 s.						SW7 = None
	SW3 = 20 s. 1 2 3	4	5	1 2	3 4 5 6		7
27	SW4 = 25 s.						Unused	38
							Switch
	SW5 = 30 s.
							SW6
28	Close Only One Switch			Close Only One Switch				39
	Pickup			Crank	Crank
04			Disconnect		Disconnect			40
	Present			Set	Speed
29								41
30								42
	Overspeed	Overspeed Overspeed				Overspeed
31			Test	Set			Relay	43
32			Shutdown					44
				Relay
33								45
34		Local Audible Alarm						46
				Relay
		Remote Visual Alarm						40-05-0400
				Relay
47								53
48		Remote Audible Alarm						54
				Relay
49								55
50	Miscellaneous Program Switches							56
	5 min. Cooldown				Air Damper Closed
	SW1 = Open		1 2	3 4 5 6 7		Light ON With
	Unused Switches				Overspeed Shutdown
51						SW7= Closed		57
	SW2
	Alarm						Shutdown
52	SW3 = Closed		Loss of Speed Circuit			SW3 = Open		58
	SW4 = Open					SW4 = Closed
	SW5 = Open					SW5 = Closed
	SW6 = Closed					SW6 = Open

6.While engine is cranking, turn crank disconnect adjustment counter clockwise slowly until “Crank Disconnect Speed” light turns on and cranking stops.

7.Turn crank disconnect adjustment clockwise 1/4 turn. This sets crank disconnect speed at approximately 125 RPM above cranking speed.

8.Turn Mode Selector switch OFF.

(f)Reconnect the run solenoid wire at terminal 6 on Relay Module.

4-4.3Start and Stop Engine; to test the start and stop function, proceed as follows:

(a)Double check all wiring to be sure it is connected.

(b)Turn Mode Selector switch to the TEST position. This gives the A900 Controller a start signal.

(c)Engine should crank, start and come up to governor speed.

1.Check “Crank Disconnect Speed” light; it should be on and “Crank Relay” light should be off.

2.If lights are not correct, turn Mode Selector switch OFF and review paragraph 4-4.2.

(d)When engine has come up to speed and governor has been

adjusted for proper running speed, turn Mode Selector switch OFF. This gives the A900 Controller a stop signal.

(e)All lights on the back of the A900 should go off and the engine stop. If engine does not stop, check run solenoid to be sure it has returned to the stop position.

4-4.4Automatic Start and Stop; to test the automatic-start and stop function, proceed as follows:

(a)Turn Mode Selector switch to the AUTO position. Short terminal 28 to 4 on the Control / Display module. This gives the A900 Controller a start signal.

(b)Engine will crank, start and come up to governor speed.

(c)When engine has come up to speed, open the circuit between terminal 28 and 4. This gives the A900 Controller a stop signal.

(d)All lights on the back of the A900 should go off and the engine stop.

4-4.5Overspeed Switch Setting; To set the speed switch, proceed as follows:

(a)Turn Mode Selector switch to the TEST position.

(b)Engine will crank, start and come up to governor speed.

(c)With engine running, adjust governor to bring engine speed to normal RPM.

(d)Depress and hold the Overspeed Test pushbutton.

(e)Slowly turn the Overspeed Set adjustment counter- clockwise until the “Overspeed” and “Overspeed Relay” lights on the A900 come on and the engine shuts down.

(f)Release pushbutton; check “Overspeed” light on front panel to be sure it is on.

(g)Turn Mode Selector switch OFF to reset shutdown circuits; then back to TEST.

(h)When engine starts, increase governor speed setting slowly until engine shuts down on overspeed. This should occur about 10% above governor speed.

(i)Turn Mode Selector switch OFF.

4-4.6Overcrank setting; to test number of cranks before system shuts down on overcrank;

(a)Disconnect the run solenoid wire from terminal 6 of the Relay Module.

(b)Check number set on the “Number Of Cranks” switch on A900 back panel. It is factory set at 3.

(c)Turn Mode Selector switch to TEST.

1.Engine will crank for 15 seconds.

2.Then rest for 15 seconds

3.This should repeat 3 times and then the “Overcrank” light on the A900 will come on and engine will not crank again.

(d)Turn Mode Selector switch OFF.

(e)Reconnect the run solenoid wire at terminal 6 of the Relay Module.

4-4.7Oil Pressure; to test oil pressure shutdown circuit:

(a)Turn Mode Selector switch to TEST. When engine starts, wait 30 seconds then,

(b)Use a jumper wire and short from terminal 30 to 4.

(c)“Oil Pressure” light will come on and engine will stop.

(d)Turn Mode Selector switch OFF.

4-4.8Water Temperature; to test the water temperature shutdown circuit:

(a)Turn Mode Selector switch to TEST. When engine starts, wait 30 seconds then,

(b)Use a jumper wire and short from terminal 32 to 4.

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