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 panel.
1. Install the Transfer Switch into the enclosure.
Carefully 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
turn it clockwise (approximately 7 or 8 turns) until the
TEST
light comes on,
DISCONNECTED
light off.
NOTE
: If the emergency source is available, the
Automatic Transfer Switch may operate to the
emergency position. If it does, operate the door–
mounted
RESET TO NORMAL
toggle switch.
Electrical Operation Te
s
t
: This 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
position.
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
) on the
STATUS
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 light
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 is used, there will be a delay
before transfer to Emergency.
NOTE: With Normal available, the Automatic
Transfer Switch will not stay in the emergency
position unless Feature 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 Automatic Transfer & Bypass Isolation Switch should
be left in this position.
