ABB Zenith
29
ZTSCT / ZBTSCT Operation & Maintenance Manual
1600-3000 AMP
Horizontal Bypass
1) Automatic
a) Manually operated Bypass Switch contacts
(BN/BE) are open and ATS is supplying load.
b) Disconnect Switch (DS) is in Auto.
2) To Bypass ATS
a) Turn DS to Inhibit.
“Open bottom cabinet door” removed.
b) Open Bypass Isolation Access panel
c) Turn Bypass Selector Switch (BSS) to same power
source as ATS
d) Position Manual Bypass Handle (MBH) upward
3) To Test ATS
a) Bypass per above instructions.
b) Rotate crank mechanism counter-clockwise until
ATS test light is illuminated.
c) Turn DS to Auto.
d) Test Switch (TS) on microprocessor controller will
allow electrical operation of ATS.
4) To Isolate ATS
a) Bypass per above instructions.
b) Rotate crank mechanism counter-clockwise
until ATS Isolated light is illuminated.
5) To Remove ATS
a) Bypass and isolate per above instructions.
b) Open Automatic Transfer Switch access panel.
c) Slide four corner latches of ATS to innermost
position.
d) ATS can now be removed from cabinet.
6) To Reconnect ATS
a) Roll cart back into cabinet.
b) Slide four corner latches of ATS to outermost
position.
c) Turn DS to Inhibit.
d) Manually position ATS into same source
as Bypass Switch.
e) Close Automatic Transfer Switch access panel.
f) Rotate crank mechanism clockwise until
ATS Test light is illuminated.
g) Turn DS to Auto and use TS to electrically
operate ATS.
h) Turn DS to Inhibit.
i) Rotate crank mechanism clockwise until ATS
location pointer is aligned with Auto mark
on location indicator. (ATS must be in same
source as Bypass.)
j) Turn DS to Auto and open Bypass with MBH.
k) ATS is now fully automatic.
Notes:
1. DS in Inhibit will prevent ATS electrical operation.
2. DO NOT use excessive force on mechanical handles.
3. Figures depict Bypass Source 1. Sequence is the same for Bypass Source 2.
4. When ATS is in Test or Isolate, Bypass Switch is a manual transfer switch to either available source (indicated on light panel).
5. To operate Bypass Switch when ATS is in Test or Isolate:
a) Move MBH downward (to open Bypass Contacts BN/BE)
b) Turn BSS to opposite power source.
c) Move MBH upward to close into selected power source.
Legend:
1. BP - Bypass switch (indicated by contacts BN/BE) is a three position switch.
2. ATS - Automatic Transfer Switch.
Sequence of Operation
(cont’d)
Figure 16
FIG. 1 BP IS OPEN WITH ATS IN SOURCE 1
FIG. 4 BP IN SOURCE 1 WITH ATS ISOLATED
ATS
BN
BE
FIG. 2 BP IN SOURCE 1 WITH ATS IN SOURCE 1
SOURCE 1
LOAD
SOURCE 2
ATS
BN
BE
SOURCE 1
LOAD
SOURCE 2
FIG. 3 BP IN SOURCE 1 WITH ATS IN TEST
(LOAD CONNECTIONS ARE OPEN)
ATS
BN
BE
SOURCE 1
LOAD
SOURCE 2
ATS
BN
BE
SOURCE 1
LOAD
SOURCE 2
