Winco ASCO 165 4-Wire - Manual (Page 6)

6
OPERATION
utility (preferred source)
acceptable light
transfer switch on generator
(alternate source) light
transfer switch on utility
(preferred source) light
generator (alternate source)
acceptable light
exerciser
light
INDICATOR LIGHTS
On the front control display are five lights that indicate the
status of the sources and the automatic transfer switch.
❍
Utility (preferred source) acceptable
(light at the top left of the display)
● When on, this light indicates that the utility voltage is
acceptable for connection to the load.
❍
Generator (alternate source) acceptable
(light at the top right of the display)
● When on, this light indicates that the generator voltage
and frequency are acceptable for connection to the load.
❍
Transfer Switch on utility (preferred source)
(light at the center left of display)
● When on, this light indicates that the load is connected to
the utility (preferred source).
❍
Transfer Switch on generator (alt. source)
(light at the center right of display)
● When on, this light indicates that the load is connected to
the generator (alternate source).
❍
Automatic Generator Exerciser
(light above button at the right of display)
● When the utility is acceptable and the load is on the utility,
this light flashes the number of days until the next exercise
period. When it is off, no exerciser period is set. The light is
also off any time the generator is running.
PUSH BUTTONS
On the front control display are two push buttons that
control the operation of the generator and the automatic
transfer switch.
● Push to Test (button on the left side)
● This button is used to test the system. See the Manual
Generator Testing section on the next page.
● This button can be used to cancel any active time delay.
Press and release the button to bypass the time delay.
● This button can be used to clear displayed error codes.
See Troubleshooting section, Problem 8.
● Automatic Generator Exerciser (right button)
● This button is used to set the automatic generator
exerciser. See the next page.
UTILITY FAILURE
The load is normally connected to the preferred source
(utility) if that source is acceptable. If the preferred source
(utility) fails, the following sequence occurs:
1. The
UTILITY source acceptable light goes off.
2. The automatic transfer switch waits three seconds to pre-
vent nuisance starting of the generator from momentary
dips of the utility voltage. If the utility is restored during the
three seconds, the
UTILITY source acceptable light
comes on and no further action is taken.
3. If the utility remains unacceptable for three seconds, the
automatic transfer switch cranks and starts the generator.
4. Once the generator starts, the automatic transfer switch
waits until the generator voltage and frequency are
acceptable. Then the
GENERATOR source acceptable
light comes on.
5. When the generator is acceptable, the automatic transfer
switch waits 15 seconds to allow the generator to warm up.
Then it transfers the load to the generator. The
TRANSFER
SWITCH on generator (alternate source) light comes on.
6. The automatic transfer switch waits for the utility source to
be restored. When the utility again becomes acceptable
the
UTILITY source acceptable light comes on.
7. The automatic transfer switch then waits 5 minutes to
allow the utility to stabilize. Then it retransfers the load
back to the utility. The
TRANSFER SWITCH on utility
(preferred source) light comes on.
8. After load retransfer the generator will continue to run
unloaded for one minute for engine cooldown. Then it is
stopped. The
GENERATOR acceptable light goes off.