Installation Manual Bypassing & Isolating
10 381333-415 B
BYPASSING & ISOLATING
BYPASSING THE ATS*
This procedure explains how to Bypass the closed
automatic transfer switch contacts. Bypassing is
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 in
the CLOSED position (window). See Figures 8, 9 and
10.
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
the position of the automatic transfer switch.
2.Bypass to the same source as connected to transfer
switch as follows (select Normal or Emergency).
Figure 8. Bypass Handle and position indicators.
To 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 all the way, then turn it
clockwise until Bypass Switch Position shows
CLOSED on NORMAL (yellow indicator). The red
light Unit Not In Automatic will flash.
Figure 9. 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
clockwise until Bypass Switch Position shows
CLOSED on EMERGENCY (yellow indicator). The
red light Unit Not In Automatic will flash.
Figure 10. Bypass to Emergency.
The automatic transfer switch can now be put in the TEST or OPEN position. See ISOLATING on page 11.
* NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.
To Bypass Normal push in handle
all the way & turn it clockwise.*
To Bypass Emergency pull out han
dle all the way & turn it clockwise.*
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.
E
L
N
Push in
Bypass
Handle
&
turn it
clockwise.
ATS
Bypass Switch
E
L
N
ATS
Bypass Switch
Pull out
Bypass
Handle
&
turn it
clockwise.
To Next Page
Loading...
