Emerson Asco 7000 Series Operator's Manual page 11

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 TEST position (window). If the handles are not
in these positions, refer to Return to Service on page 3–3.
See Figures 3–11, 3–12, and 3–13.
Indicator shows:
green OPEN when the
ATS is not bypassed.
To un–Bypass Normal push in handle
all the way & turn it counterclockwise.*
To Un–Bypass Normal Source*
(Load connected to Normal Source)
The Transfer Switch Connected To Normal light is on
and Transfer Switch Connected To Emergency light is off.
Push in* the Bypass Handle then turn it counterclockwise
until Bypass Switch Position shows OPEN (green indica-
tor). The Unit Not in Automatic light should be off.
Push in
Bypass Switch
Bypass
Handle
&
turn it
counter-
clockwise.
ATS
Figure 3–12. Un–Bypass Normal.
The Automatic Closed–Transition Transfer & Bypass–Isolation Switch should be left in this position.
* NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.
BYPASSING & ISOLATING
(continued)
Figure 3–11. Bypass Handle and position indicators.
E
L
N
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).
Indicator shows:
yellow
when ATS is bypassed to Emergency
or
yellow
bypassed to Normal Source.
To un–Bypass Emergency pull out
To Un–Bypass Emergency Source*
(Load connected to Emergency Source)
The Transfer Switch Connected To Emergency light is on
and Transfer Switch Connected To Normal light is off.
Pull out* the Bypass Handle then turn it counterclock-
wise until Bypass Switch Position shows OPEN (green
indicator). The Unit Not in Automatic light should be off.
Pull out
Bypass
Handle
&
turn it
counter-
clockwise.
Figure 3–13. Un–Bypass Emergency.
3---4
EMERGENCY CLOSED
NORMAL when ATS is
handle all the way & turn it
counterclockwise.*
Bypass Switch
ATS
E
L
N