Supervised Transfer Control Switch; Automatic Mode; Non-Automatic Mode - Kohler MPAC 1500 Manual

8.9 Supervised Transfer Control
Switch
The supervised transfer control switch (AUTO/
MANUAL/TRANSFER switch) is a three-position, key-
operated switch that allows manual control of load
transfers. The alarm module is required for installation
and operation of the supervised transfer control switch.
The switch connects to P22 on the alarm module. See
Figure 8-10.
The switch has maintained AUTO and MANUAL
positions and a momentary TRANSFER position. The
key can be removed in either the AUTO or MANUAL
position. The key cannot be removed when the switch is
in the TRANSFER position. Figure 8-25 shows the
switch.
Figure 8-25

Supervised Transfer Control Switch

When the Supervised Transfer Control switch is in the
AUTO position, the controller responds normally to
transfer requests, and will automatically transfer to a
source if that source is available.
The manual mode allows the system to run on the
standby source indefinitely, even if the preferred source
is available. In manual mode, the controller is inhibited
from initiating a transfer sequence until the keyswitch is
turned to the TRANSFER position.
It is not necessary to hold the switch in the TRANSFER
position during the transfer sequence. Turn the switch
to TRANSFER and release it to initiate transfer. The
transfer sequence will proceed after the switch returns
to the MANUAL position, executing all programmed
time delays and transferring the load to the other source
if it is available.
116 Section 8 Accessories
Automatic and Non-Automatic Transfer Switches.
The switch operation differs for automatic and
non-automatic switches. An automatic transfer switch
transfers automatically to an available source if the
connected source is lost. A non-automatic transfer
switch does not transfer automatically, even if the
connected source is lost. Figure 8-26 summarizes the
switch operation.
Note: Transfer switches are built and UL-labeled as
automatic or non-automatic by the factory and
cannot be converted in the field. The supervised
transfer control switch must not be removed from
non-automatic switches in the field.
8.9.1

Automatic Mode

In Automatic Mode with the Supervised Transfer Control
Switch in the MANUAL Position, the contactor will
automatically transfer to the available source if the
connected source is not available. In this case, no user
action is required to initiate the transfer.
Operation with Test and Peak Shave
In Automatic Mode with the Supervised Transfer Control
Switch in the MANUAL position, a test, peak shave, or
loaded exercise command will be recognized and a
transfer sequence to the standby source will operate
normally. However, ending the test or removing the
peak shave signal will not cause a transfer back to the
preferred source. Move the supervised transfer control
switch to the TRANSFER position to initiate transfer
GM21286
back to the preferred source.
8.9.2

Non-Automatic Mode

In Non-Automatic Mode, any transfer to an acceptable
source can only be accomplished with the Supervised
Transfer Control Switch. If the Supervised Transfer
Control switch is in the MANUAL Position, the controller
is inhibited from initiating a transfer sequence until the
switch is moved to the Transfer Position. This will
prevent a transfer even if the source fails. To initiate a
transfer sequence, move the switch to TRANSFER,
then back to MANUAL.
proceeds when the switch returns to the MANUAL
Position.
controller is waiting for the TRANSFER signal. The
display indicates that the supervised transfer mode is
active.
Operation with Test and Peak Shave
In Non-Automatic Mode, the test, peak shave and
loaded exercise signals are ignored when the
Supervised Transfer Control Switch is in the MANUAL
position.
The transfer sequence
The not-in-auto LED flashes while the
TP-6714 4/10