RXT Transfer Switch Manual

TP-6807 1/1634 Section 3 Operation
3.6 Time Delays
Time delays are factory-set to the values shown in
Figure 3-10. An authorized distributor/dealer can adjust
time delays using a personal computer and Kohlerr
SiteTecht software.
Time delays shown in Figure 3-10 operate only when
the RDC2 or DC2 generator set controller is connected
to a Kohlerr Model RXT transfer switch.
The engine start and load transfer time delays prevent
engine start and load transfer caused by brief variations
in the utility power source.
3.7 Load Control Time Delay
The standard interface board includes a load control
time delay. The load control time delay allows delayed
starting of large motor loads (such as air conditioners),
preventing simultaneous starting of large motors after
transfer to the generator set. The load control time delay
is fixed at 5 minutes. It is not adjustable.
The load must be connected to the load control output
on the interface board of the Model RXT transfer switch.
See Section 2.9 for connection instructions.
Note: For load add and load shed operation based on
generator capacity, use the load shed kit or the
combined interface/load management board.
See Sections 1.4.2, 2.7, and 3.4 for more
information about load management.
Time Delay Setting Description
Engine Start 3 seconds Time delay after utility source is lost until the engine start cycle begins.
Guards against starting the generator set because of a brief change in
the utility source.
Transfer, Normal to Emergency 3 seconds Time delay after emergency source becomes available until transfer to
emergency source.
Transfer, Emergency to Normal 2 minutes Time delay after the utility source returns until transfer back to normal.
Ensures that the the utility source is stable before transferring from the
emergency source.
Load Control
(standard interface board only)
5 minutes Allows delayed connection of selected loads to the generator set.
Prevents simultaneous starting of large motors after transfer to the
emergency source. Recommended for delayed starting of air
conditioners.
Figure 3-10 Time Delays