Asco 7000 Series - Voltage Checks

Installation Installation Manual
381333-415 B 7
Figure 4. Standard controls and indicators.
(Transfer Test continued from page 6)
1. Turn the Isolation Handle counterclockwise
(approximately 12 turns) until the window shows
TEST position.
NOTE: The engine generator may be signaled to
start while turning the Isolation Handle. If emergency
source is available, the ATS may operate to the
emergency position. If it does, operate Retransfer
Delay Bypass switch.
2 Perform steps 1–5 at right. Observe the status
lights.
■ Black square means light is on.
 White square means light is off.
7ACTB
The load is transferred via overlap (closed) transition.
Transfer switch CE closes, then transfer switch CN
opens. The operation is reversed for retransfer back
to normal. If you do not want closed–transition
transfer, press the Closed Transition Bypass button
(Figure 5) while the controller display shows Waiting
for In–Sync. This action causes open–transition
(momentary load interruption) transfer to the opposite
source, if conditions permit.
7ADTB
The load is disconnected and light (Figure 6) comes
on during the delayed–transition transfer delay.
3. Turn the Isolation Handle clockwise
(approximately 12 turns) to the CONN (connected)
position.
4. Push in the Bypass Handle and turn it
counterclockwise until the OPEN indicator shows
green.
Figure 5. 7ACTB controls. Figure 6.
7ADTB controls
1 The Transfer Switch Connected to
Normal and Normal Source
Accepted lights should be on.
2 Turn and hold 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 Transfer switch will operate to the
Emergency position after Feature
2B time delay. The Transfer
Switch Connected to Emergency
light should come on and the
Transfer Switch Connected to
Normal light should go off (7ACTB
you might see and hear the brief
overlap transfer).
4 Transfer switch will operate back
to Normal position after Feature
3A time delay. For immediate
retransfer turn Transfer Control
counterclockwise to Retransfer
Delay Bypass. The Transfer
Switch Connected To Normal light
should come on; Transfer Switch
Connected to Emergency light
should go off.
5 The engine–generator will stop
after the Feature 2E time delay
(unloaded running engine
cooldown). The Emergency
Source Accepted light should go
off.
This completes the Functional Test of the ATB.
operate
this switch
observe
these
lights
7ADTB light is
on when load is
disconnected
7ACTB alarm lights
(see troubleshooting)
7ACTB buttons
Load
Disconnect
Active
Load
Disconnect
Active
Load
Disconnect
Active
Load
Disconnect
Active
Load
Disconnect
Active