Emerson 400A Adjustments, How to Change a Setting, Cover Thumb Latch Hook on left side, Switches

ADJUSTMENTS (continued)

NOTICE

Do not make any setting changes while the controller is energized.

How to Change a Setting

1.Prevent the transfer switch from operating by discon- necting one source first, then the other, as follows:

a.If the transfer switch is in the Normal position, open the emergency source circuit breaker. Turn the engine starting control to off. Then open the normal source circuit breaker.

b.If the transfer switch is in the Emergency position, open the normal source circuit breaker. Turn engine starting control to test or run. Then open the emergency source circuit breaker.

2.Disconnect both harness plugs from controller by squeezing the latches. Do not pull on the wires.

3.Remove cover from the controller by releasing latch on right side with your thumb. See Figure 4-1.

4.Locate the appropriate adjustment potentiometer or DIP switch for the setting that you want to change. Refer to Table 4-1 and Table 4–2 on page 4-1 and Figure 4-2, Figure 4–3, Figure 4–4 on page 4–2.

5.Use a small screwdriver to turn the potentiometer clockwise to increase the time delay or counter- clockwise to decrease it. See Figure 4-3.

6.Use a ball-point pen (or similar pointed tool) to slide the switch actuators left or right so they match the illustration next to the setting (left = off, right = on). Recheck the setting. See Figure 4-4.

cover	thumb
	latch

hook on left side

Figure 4-1. Controller cover latch.

	9 volt
	alkaline
	battery
	J5 battery
harness	on/off
	jumper
plugs
	P1
	retransfer
	to normal
	time delay
S3 DIP	P2
	transfer to
switch	emergency
S1 DIP	time delay
switch
	S2 DIP
	switch

Figure 4-2. Location of potentiometers.

7.Install the cover on the controller by hooking it on the left side and latching the right side.

8.Reconnect both harness plugs to the controller by aligning and pressing straight in until latches click.

Close the transfer switch enclosure door.

clockwise to increase

P1 or P2 potentiometer

counterclockwise to decrease

Figure 4-3. Changing time delay potentiometers.

9.Close the enclosure door, then restore both sources:

a.If the transfer switch is in the Normal position first close the normal source circuit breaker, then close the emergency source circuit breaker.

b.If the transfer switch is in the Emergency position, close the normal source circuit breaker. The load will be automatically retransferred to the normal source. Then close the emergency source circuit breaker.

10. Turn the engine starting control to automatic.

4---2

DIP

switches

SW1

SW2

SW3 actuator

(8 on each DIP switch)

off on

Figure 4-4. Setting DIP switch actuators.