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SECTION 3 BYPAS SING & ISOLATING
3 --- 1
BYPASSING THE ATS*
This procedure explains how to Bypass the closed
automatictransfer switchcontacts. Bypassingis required
before the ATS can be tested or isolated. The Bypass
Handle must be in the OPEN position (green indicator)
and the Isolation Handle must be i n the CLOSED
position (window). See Figures 3–1, 3–2, and 3–3.
You can only bypass to the same source
that the Transfer Switch is connected.
Solenoid interlock prevents incorrect operation.
1. Observe which Transfer Switch Connected To light is
on (Normal or Emergency) on the door. This is t he
position of the automatic transfer switch.
2. Bypass to the same source as connected to
transfer
switch
as follows (select Normal or Emergency).
To Bypass Normal push in handle
all the way & turn it clockwise.*
To Bypass Emergency pull out han-
dlealltheway&turnitclockwise.*
Indicator shows:
green
●
OPEN when the
ATS is not
bypassed.
Indicator shows:
yellow
●
EMERGENCY CLOSED
when ATS is bypassed to Emergency
or
yellow
●
NORMAL CLOSED when
ATS is bypassed to Normal Source.
Figure 3–1. Bypass Handle and position indicators.
To B ypass Normal Sourc e*
(Load connected to Normal Source)
The Transfer Swit ch Connected To Normal light is on
and Transfer Switch Connected To Emergency light is off.
Push in
* the Bypass Handle all the way, then turn it
clockwiseuntilBypassSwitch Positionshows CLOSEDon
NORMAL (yellow indicator). The red light Unit Not In
Automatic will flash.
E
L
N
Push in
Bypass
Handle
&
turn it
clockwise.
ATSE
Bypass Switch
Figure 3–2. Bypass to Normal.
To 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 all the way, then turn it
clockwiseuntilBypassSwitch Positionshows CLOSEDon
EMERGENCY (yellow indicator). The red light Unit
Not In Automatic will flash.
E
L
N
ATSE
Bypass Switch
Pull out
Bypass
Handle
&
turn it
clockwise.
Figure 3–3. Bypass to Emergency.
The automatic transfer switch can now be put in the TEST or OPEN position. See ISOLATING on pa ge 3–2.
*NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.