Operation Of Bypass/Isolation Switch - Zenith ZBTSH Series Instruction Manual

BYPASS/ISOLATION SWITCH OPERATION
BP- Bypass Switch, Indicated by Contacts BN/BE, is a 3 Position Switch
ATS- Automatic Transfer Switch
-:. EMERGENCY
BE
,._,...p-_._+
lOAD
1. Automatic
BNJ_~~:"- ~
NORMAL
1. Manually operated Bypass Switch contacts (BN/BE) are open
and the ATS is supplying the load. (Fig. 1).
AT
2. Disconnect Switch (OS) is in "Auto" position.
-
FIG. I BP IS OPEN WrrH ATS N
NORMAL POSITION.
-:.EMERGENCY
BE lOAD
2. To Bypass ATS
BN,/;_(
~J ~ ~
NORMAL
1. Open bottom cabinet door and turn OS to "Inhibit".
2. Position Manual Bypass Handle (MBH) to same power source
AT
as ATS (Fig. 2).
·-
FIG.2 BP IS BYPASS NORMAL WITH
ATS
IN
NORMAL.
POSITION.
3. To Test ATS
1. Bypass per above instructions.
- - - . -..... ~ EMERGENCY
BE
..,_,...p-_._+
LOAD
BN L
-.c
~ORMAL
2. Move ATS Location Handle (ALH) to "Test" location.
3. Turn OS to "Auto".
.l_
4. Test Switch (TS) on bottom cabinet door will allow electrical
Fn3 8P IS BYPASS NJRioiAL. WITH
testing of ATS. (Fig. 3).
ATS
IN TESI'
lOCATXlN. CATS
l.OAO CCNNECTION IS OPEN)
4. To Isolate ATS
1. Bypass per above instructions.
2. Move ALH to "Isolate" location.
5. To Remove ATS
1 . Bypass and Isolate per above
instructions.
2. Move ALH to "Release" location.
3. Disconnect multi-pin plugs and ex­
ternal connections.
4. Lift ATS out of drawer.
6. To Reconnect ATS
1. Place A TS into drawer slots, (front
rollers first).
2.. Turn OS to "Inhibit" position.
3. Position ATS to same source as
Bypass Switch.
4. Reconnect Multi-pin plugs and exter­
nal connections.
5. Push ATS inward to engage carriage.
6. Move ALH to "Test" location (as in­
dicated by light).
7. Turn OS to "Auto" position and use
TS to electrically operate ATS.
8. Turn OS to "Inhibit" position.
B E ' i j : EMERGENCY
LOAD
BN NOIWAL.
·~
Fn4 8P IS IM'ASS NORMAL WITH·
ATS IN
ISOLATE
LOCATIOK
9. Move ALH to "Auto" location.
10. Turn OS to "Auto" and position
MBH to "Open".
11. ATS now fully automatic (Fig. 1).
7. Notes
1. OS in "Inhibit" position will prevent
A TS electrical operation.
2. Do not use excessive force on
mechanical handles (interlocks pre­
vent incorrect sequencing).
3. When ATS is in Test or Isolate,
Bypass Switch is a manual transfer
switch to either available power
source.
4. To operate Bypass Switch when
ATS is in Test or Isolate, position
MBH to available power source (in­
dicated on light panel).
5. Above figures depict Bypass Normal;
sequence is same for Bypass
Emergency.
8