Product Manual

TP-6946 3/16 61Section 7 Changing the Service Disconnect Position
Section 7 Changing the Service Disconnect Position
7.1 Introduction
The service disconnect operation for Model KEP service
entrance rated automatic transfer switches equipped
with the Decision-Makerr MPAC 1500 controller has
changed. When the transfer switch is put into service
disconnect mode:
D The original design transfers to Emergency and
signals the generator set to start.
D The new design transfers to the OFF position. Both
sources are disconnected and the generator set is
NOT signalled to start.
The new style switches are identified by the decal shown
in Figure 7-1, located near the service disconnect
switch on the outside of the enclosure door.
The new design uses controller firmware version 1.10
(or higher) and new transformer assemblies. See
Figure 7-2 for illustrations of original and new
transformer assemblies.
If the transfer switch is equipped with the new
transformer assembly, kit number GM94796-AA1 or
GM94796-AA2 will appear in the accessories section of
the transfer switch nameplate. The nameplate is
located on the controller cover on the inside of the
enclosure door. Transfer switches equipped with an
original transformer assembly GM69797-KA1 or
GM69797-KA2 do not have the transformer kit number
printed on the nameplate.
NOTICE:
SERVICE DISCONNECT TRANSFERS
TO OFF, REMOVING POWER FROM
THE LOAD. POWER WILL NOT BE
RESTORED UNTIL THE SWITCH IS
RETURNED TO AUTO.
Figure 7-1 Service Disconnect to OFF Decal
Orignal Transformer Assemblies
Transfer switches equipped with an original transformer
assembly GM69797-KA1 or GM69797-KA2 must use
the Service Disconnect to Emergency position only.
The transformer kit number is not printed on the
nameplate.
If the controller is replaced or the controller firmware is
upgraded on a unit that has the original transformer
assembly, it will be necessary to change the service
disconnect position on the controller back to Emergency
as described in Section 7.2.1.
Revised Transformer Assemblies
Transfer switches equipped with revised transformer kit
number GM94796-AA1 (for MCCB models) or
GM94796-AA2 (for ICCB models) are factory set to use
the Service Disconnect to OFF position. Kit number
GM94796-AA1 or GM94796-AA2 will appear in the
accessories section of the transfer switch nameplate
and the transfer switch door will have the service
disconnect label shown in Figure 6-1.
The nameplate is located on the controller cover on the
inside of the enclosure door. See Figure 1-3 in Section
1.3 of this manual for an illustration of the ATS
nameplate, if necessary.
Transfer switches equipped with revised transformer
assemblies can be converted to use the Service
Disconnect to Emergency position, if necessary. Follow
the instructions in Section 7.2.