TP-6714 4/10 63Section 5 Setup
5.8 Prime Power Run
The transfer switch can be used between two prime
power sources (two generator sets). The prime power
run feature allows the controller to sequence the usage
of each generator set to equalize the run times. Prime
power mode is not available for service entrance
models.
Note: Follow the generator set requirements for prime
power operation and maintenance. Not all
generator sets are approved for prime power
applications; check the generator set
documentation.
An external battery module is recommended for this
type of application. See Section 8.6.
5.8.1 Prime Power Mode Setup
D In the Set System menu, set the source type to
Gen-Gen. See Section 5.14, Set System.
D Connect the engine start leads of the source 2
generator set to the ATS engine start leads. See the
ATS Operation/Installation Manual for the engine
start connection terminals.
D Connect the engine start leads of the source 1
generator set to output 1. Connect to a different
output on the main logic board or accessory I/O
module if output 1 is not available. Assign the Source
N Start Signal function to the output connected to the
source 1 generator set engine start leads. See
Section 5.12, Programmable Inputs and Outputs.
D Check the overfrequency and underfrequency pick
up and drop out settings for both sources, and adjust if
necessary.
D Set the normal source engine start and engine
cooldown time delay settings.
D Navigate to the Set Prime Power Run menu. Enable
the prime power event and program the S1 and S2
generator set run duration times in
days:hours:minutes (i.e. how long each generator set
runs before transfer to the other generator set). See
Figure 5-9.
D In the Prime Power Event screen, use the up arrow
button to switch between Start and Stop. Select Start
and then press Save to save the duration settings and
start the prime power sequence.
5.8.2 Prime Power Mode Operation
During a prime power run sequence, the main screen
displays a countdown of the run time remaining for the
generator set that is currently running.
The transition type selected in the Set System menu
determines the type of transfer between the two prime
power sources. For example, on closed-transition
model transfer switches, the transfer between sources
will be closed, resulting in no power interruption to the
load during transfer. Other transition types use a
break-before-make transfer that can c ause a brief
interruption of power to the load.
Note: Only Model KCC and KBC transfer switches can
operate in closed-transition mode.
During a prime power sequence, the preferred source
selection alternates so that the generator set operating
at the time is designated as the preferred source.
Press the end button to start the other generator set and
transfer the load. The generator set run time may be
ended by pushing the end time delay button. This will
start the alternate source, transfer the source, and run
on the alternate source for the programmed period of
time. The first generator set will run for the programmed
engine cooldown time and then be signaled to stop.
To stop the prime power run sequence, enter the Set
menus (password required), navigate to the Set Prime
Power Run menu, Prime Power Event Sequence
Start/Stop. Use the up arrow button if necessary to
switch to Stop, and press Save.
Prime Power Event
Enable/Disable
Set Prime Power Run
BY "Main
Back Next
Prime Power Event
Sequence: Start/Stop
Back Save
Back Next
Duration at Source1
??:??:?? DD:HH:MM
Back Next
Duration at Source2
??:??:?? DD:HH:MM
Figure 5-9 Set Prime Power Run Menu
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