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BYPASSING & ISOLATING
(continued)
3--3
RETURN TO SERVICE
This procedure explains how to return the Automatic
Transfer Switch to service after inspection and
maintenance. Observe the ATS POSITION lights on the
STATUS INDICATOR pane l.
1. Install the Transfer Switch into the enclosure.
Caref ully follow directions on page 3–2.
Close enclosure door to prevent personal
injury in case of electrical system fault.
!
2.. Install the Isolation Handle (through the door) and
turnit clockwise (approximately 7 or 8turns) until the
TEST light comes on, DISCONNECTED light off.
NOTE: If the emerg ency source is available, the
Au tom atic Transfer Switch may operate to the
eme r g en cy pos itio n. I f it does , op er ate the do or–
mounted RESET TO NORMAL toggl e switch .
Electrical Operation Test: Thi s procedure will check the
electrical operation of the Automatic Transfer Switch
without interrupting the load. It still should be Bypassed
and in the TEST position. The engine starting control
should be in the automatic posi tion.
Transfer Test
Perform the 5–step Transfer Test procedure on page 1–7.
The isolating contacts cannot be closed until the Transfer
Switch is in the same position as the Bypass Switch.
3. Observe which Bypass Switch CLOSED ON light is on
(NORMAL or EMERGENCY)ontheSTATUS
INDICATOR panel as shown in Figure 3-7. This light
indicates the source connected to the load.
4. Observe which Transfer Switch CLOSED ON light is
on (NORMAL or EMERGENCY). This l ight
indicates the position of the Transfer Switch. If it is
not in the same position as the Bypass Switch, change
the Transfer Switch position as follows.
To change the position of transfer switch
Operate to NORMAL Operate to EMERGENCY
Turn Transfer Control
switch counterclockwise
to Retransfer Delay By-
pass.
Turn Transfer Control
switch clockwise to Transfer
Test and hold
.*
Transfer Switch Con-
nected to Normal light
should come on.
Transfer Switch Connected
to Emergency light should
come on.
* If Feature 2B time delay i s used, there will be a delay
before transfer to Emergency.
NOTE: With Normalavailable, the Automatic
Transfer Switch will not stay in the emergency
position unless Feat ure 3A time delay is used
(at least 30 seconds).
Figure 3-7 . Status Indicator Panel
Do not close the isolating contacts unless
the transfer switch and bypass switch
are in the same
postion.
!
5. Turn the Isolation Handle and turn it clockwise until
it stops
(approximately 6 or 7 turns). The
CONNECTED light should come on, TEST light off.
6. Remove the Isolation Handle and store it inside the
enclosure on the right side.
7. Turn Bypass Handle
clockwise as shown in
Figure 3-8 to AUTO-
MATIC POS . The By-
pass Switch CLOSED
ON NORMAL or
EMERGENCY light
should go off.
Figure 3-8 Turn Bypass Handle to AUTOMATIC.
The AutomaticTransfer &Bypass Isolation Switchshould
be left in this position.