BYPASSING & ISOLATING
(continued)
3---7
RETURN TO SERVICE
continued*
This procedure explains how to return the Bypass Switch
Handle to the OPEN position. The Bypass Handle must
be in the
CLOSED
position (yellow indicator on
NOR-
MAL
or
EMERGENCY
) and the Isolation Handle must
be in the
CONN
position (window). See Figures 3–20,
3–21, and 3–22.
You can only bypass to the same source
that the ATS is connected. Solenoid
interlock prevents incorrect operation.
1
Observe which Bypass Switch Position indicator is
yellow (
NORMAL
or
EMERGENCY
) at the Bypass
Switch Handle. This indicates the source connected
to the load.
2
Un–Bypass to same source as the Bypass Switch
Position as follows (select Normal or Emergency).
Window indicator
shows green
when the ATS is
not bypassed.
Window indicator
shows yellow
when ATS is
bypassed to
Emergency.
Window indicator
shows yellow
when ATS is
bypassed to
Normal.
Figure 3–20. Bypass Handle and position indicators.
To Un–Bypass Normal Source*
To Un–Bypass Emergency Source*
(Load connected to Normal Source)
The
Transfer Switch Connected To Normal
light is on
and
Transfer Switch Connected To Emergency
light is off.
(Load connected to Emergency Source)
The
Transfer Switch Connected To Emergency
light is on
and
Transfer Switch Connected To Normal
light is off.
Turn the handle clockwise.*
Turn the handle counterclockwise.*
Turn* the Bypass Handle clockwise until the
Bypass
Switch Position
shows OPEN (green window indicator).
The
Bypassed to Normal
light should go off and the
Not
In Automatic
light should go off.
E
L
N
Turn
Bypass
Handle
clockwise.
ATS
Bypass Switch
Figure 3–21. Un–Bypass Normal diagram.
Turn* the Bypass Handle counterclockwise until the
Bypass Switch Position
shows OPEN (green window
indicator). The
Bypassed to Emergency
light should go off
and the
Not In Automatic
light should go off.
E
L
N
ATS
Bypass Switch
Turn
Bypass
Handle
counter-
clockwise.
Figure 3–22. Un–Bypass Emergency diagram.
The Automatic Transfer & Bypass–Isolation Switch should be left in this position.
* NOTE
: When Accessory 40*B (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.
