Asco 7000 Series - Bypassing & Isolating; Bypassing the ATS

8 Chapter 2 Installation And Operation
ASCO 7000 Series Medium Voltage Transfer Switch User Manual
2.2.4 ATS Electrical Operation
Figure 2-5 7ATS controls and indicators.
ATS Electrical Operation
This procedure checks the electrical operation of the
automatic transfer switch. See Figure 2-5.
Transfer Test
Both normal and emergency sources must be available
and the emergency source generator (if used) must be
capable of being started in this procedure.
Perform the steps at the right. Observe the status lights.
■ Black square means light is on.
□ White square means light is off.
1
The Transfer Switch Connected
to Normal and Normal Source
Accepted lights should be on.
2
Turn and hold the Transfer
Control switch clockwise to
Transfer Test until the engine
starts and runs (within 15 sec.).
The Emergency Source
Accepted light should come on.
3
The transfer switch will operate
to the Emergency position after
Feature 2B time delay.
The Transfer Switch Connected
to Emergency light should come
on and Load Connected to
Normal light goes off.
4
The transfer switch will operate
back to the Normal position after
Feature 3A time delay.
For immediate retransfer turn
the Transfer Control counter-
clockwise to Retransfer Delay
Bypass.
The Transfer Switch Connected to Normal light
should come on; the Transfer Switch Connected
to Emergency light should go off.
5
The engine-generator will stop
after the Feature 2E time delay
(unloaded running engine cool-
down). The Emergency Source
Accepted light should go off.