Asco 7000 Series - Isolating the ATS

10 Chapter 2 Installation And Operation
ASCO 7000 Series Medium Voltage Transfer Switch User Manual
2.2.6 ADTS Electrical Operation
Figure 2-7 7ADTS controls and indicators.
ADTS Electrical Operation
This procedure checks the electrical operation of the
automatic delayed-transition transfer switch. See Figure
2-7.
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
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.
2
CBN opens and the Transfer
Switch Connected to Normal
light should go off and the Load
Disconnect Active light should
come on. Both CBN and CBE
contacts are now open.
3
After the delay transition time
delay, CBE closes. The
Transfer Switch Connected to
Emergency light should come on
and the Load Disconnect Active
light goes off.
4
CBN closes 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.