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INSTALLATION (continued)
1--7
Transfer Switch
Connected
To
Normal
Transfer Switch
Connected
To
Emergency
Normal
Source
Accepted
Emergency
Source
Accepted
Transfer
Control
Retransfer
Delay
Bypass
Transfer
Test
HOLDFOR
15SECONDS
RED
RED
GREEN
GREEN
(
)
Automatic Transfer
& Bypass–Isolation Switch
observe
these lights
operate
this switch
Figure 1-13. Standard controls and indicators.
3 – Electrical Operation
This p rocedure checks electrical operation of the ATS.
Be sure to close all enclosure doors
before proceeding to prevent personal injury
in case of electrical system fault.
!
Transfer Test
The ATS should still be bypasse d and isolated. Both
normal and emergency sources must be available and the
emergency source generator (if used) must be capable of
being started; put engine starting control in automatic
position. The Transfer Switch Connected to Normal light
and the Normal Source Accepted light should be on.
1. Turn Is o lat i on Handle cl o c k w is e about 7–8 turns until
TEST light comes on, DISCONNECTED light off.
2. Perform steps 1–5 at right. Observe the status lights.
■ Black square means light is on.
❐ White s quare means light is off.
3. Turn the Isolation Handle clockwise until it stops
(about 6 or 7 turns). The CONNECTED light should
come on, TEST light off. Remove the Isolation
Handle and store it inside the enclosure on the
carriage frame on the right side.
4. Turn the Bypass Handle clockwise to the AUTO-
MATIC POS posi tion. The Bypass Switch CLOSED
ON NORMAL light should go off.
This completes the Functional Test of the ATB. The g enera-
tor’s starting control should be left in automa ti c position.
1
The Transfer Switch C onnected
to Normal and Normal Source
Accepted lights should b e on.
2
Turn and hold Transfer Control
switch clockwise to Transfer
Test until the engine starts
and runs (within 15 s ec.). The
Emergency Source Accepted
light should come on.
3
Transfer switch will operate to
the Emergency position after
Feature2Btimedelay.The
Transfer S witch Connected To
Emergency light should come
on and Load C onnected to
Normal light goes off.
4
Transfer switch will operate
back to Normal position after
Feature3Atimedelay.Forim-
mediate retransfer turn Transfer
Control counterclockwise to
Retransfer D e lay Bypass.The
Transfer S witch Connected To
Normal light should come on;
Transfer S witch 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.