GE Industrial Solutions ZBTSCTH SERIES 100 - 4000 AMPS - Manual (Page 16)

ZBTSCTH Operation and Maintenance Manual (46R-7000) 14 Zenith Controls, Inc.
SECTION III - MAINTENANCE AND TESTING
(Continued)
5. EMERGENCY SERVICE
PROCEDURE FOR EXTENDED
PARALLEL TIME
a. Auto Location:
Removal of closed transition transfer switch
after Emergency breaker shunt trip.
1) Disconnect all power sources from
bypass-isolation transfer switch.
2) Open the bottom cabinet door and turn
the Disconnect Switch (DS) to the OFF
position.
3) Remove the service access cover on
the left hand side of the transfer switch.
4) The manual operator and the manual
handle will now be exposed. Insert the
handle into the Emergency side manual
operator. Open the Emergency side
contacts.
5) Close bottom cabinet door.
6) Energize Normal power.
7) Close the bypass contacts (BN) as
described in Section II of this manual.
8) Isolate the transfer switch as described
in Section II.
9) Remove the transfer switch from the
bypass-isolation transfer switch as
indicated on the bypass instruction label
to inspect and repair.
10) Re-install the transfer switch after
maintenance with contacts closed to the
same source as the bypass switch. Re-
install the manual handle in its holder
and the service access cover on the left
side of the transfer switch.
11) Re-connect the transfer switch to AUTO,
as described in Section II.
b. Auto Location:
Removal of the closed transition transfer
switch if Normal and Emergency contacts
remain open.
1) Turn the BSS to an available source.
Close the bypass switch into the
available source as described in
Section II of this manual.
2) Turn the DS to INHIBIT. Remove the
transfer switch service access cover.
Close the transfer switch into the same
source as the bypass switch. (Incorrect
sequencing is prevented by the
interlocks while the transfer switch is in
AUTO only.)
3) Remove the transfer switch from the
bypass-isolation transfer switch as
indicated in Section II to inspect and
repair.
c. Test Location:
Removal of the closed transition transfer
switch if both Normal and Emergency
contacts remain open.
1) Close the bypass switch contacts (BN)
as indicated on the bypass instruction
label on the cabinet door.
2) Disconnect all power sources from
bypass-isolation closed transition
transfer switch.
3) Open bottom cabinet door. Turn the
Disconnect Switch (DS) to the OFF
position.
4) Remove the service access cover on
the left side of the transfer switch.
5) The manual operator and the manual
handle will not be exposed. Insert the
handle into the Normal side and close
the Normal contacts.
6) Close the bottom cabinet door.
7) Energize Normal power.
8) Remove the automatic transfer switch
from the bypass-isolation transfer switch
as indicated in Section II.
9) Re-install the transfer switch after
maintenance with contacts closed to the
same source as the bypass switch. Re-
install the manual handle in its holder
and the service ccess cover on the left
side of the transfer switch.
10) Re-connect the transfer switch to AUTO,
as indicated in Section II.