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Automatic transfer switch (ATS)
EPCT FirE sEriEs FirE PumP ConTrollEr
MN124016EN August 2019 www.eaton.com
6.5 ATS control board & touchscreen display
The ATS control board is connected to the main fire pump
controller I/O board by a ribbon cable. Through this cable it
is able to receive and send both power and control signals
necessary for proper controller and ATS operation when
supplied by either source. The ATS board is also provided
with terminations for a number of important inputs and
outputs specific to the ATS functionality.
6.5.1 Inputs
•
Source 2 Input Supply Voltage
Supplies Source 2 power to the ATS board and the I/O
board when Source 1 is absent.
•
Source 2 Isolating Switch is in the OFF Position
Feedback from the auxiliary switch located in the Source
2 MIS to indicate if the disconnect is in the open or
closed position.
•
ATS is in the NORMAL Position
Feedback provided by the auxiliary switch located in the
Source 1 ATS isolation switch that shows if the isolation
switch is in the open or closed position.
•
ATS is in the EMERGENCY Position
Feedback provided by the auxiliary switch located in the
Source 2 ATS isolation switch that shows if the isolation
switch is in the open or closed position.
6.5.2 Outputs
•
Emergency source circuit breaker shunt trip connection.
Provides a signal to the Source 2 circuit breaker shunt trip
mechanism to trip the breaker in the event of a locked
rotor level current event.
•
Source 2 Disconnected.
The 7CR relay is used to provide indication of the status
of the Source 2 MIS. When the Source 2 MIS is turned to
the OFF position the relay will activate.
•
Engine start contacts.
The 8CR relay provides a contact that will activate
during power loss or when Source 1 power becomes
unavailable. 8CR relay is wired to terminals 51 and 52
located in the ATS section/cabinet.
•
Transfer motor/brake control.
When there is a call to transfer, the 9CR relay will
energize to start the ATS motor.
6.5.3 Touchscreen display ATS graphics
The home page on the touchscreen display will show the
position of the transfer switch. When the ATS is in the
Source 1 position the single line graphic on the display will
show the Source 1 ATS contact closed and the Source 2
ATS contact open. When in the Source 2 position the single
line graphic on the display will show the Source 2 ATS
contact closed and the Source 1 ATS contact open. When
the transfer switch is in the neutral position both the Source
1 and Source 2 ATS contacts will show open. If the MIS for
Source 2 is open a visual and audible alarm for the Source 2
Disconnect should appear and the single line graphic on the
display will show the EMER. DISC contacts as open.
6.6 Programming
Refer to Appendix G for the menu structure of the ATS
6.6.1 Time delay S1 to S2
This feature provides a time delay when transferring from
Source 1 to Source 2. The timer starts when the controller
detects that Source 2 becomes available.
6.6.2 Time delay S2 to S1
This feature provides a time delay when transferring from
Source 2 to Source 1. The timer starts when the controller
detects that Source 1 becomes available.
6.6.3 Time delay neutral
When enabled, the transfer switch will stop in neutral
position (both breakers are in the open/disconnected
position) and wait until the TDN timer expires. Once the
timer expires, the transfer switch will complete the transfer
to the target source.
6.6.4 Time delay engine start
The timer, if enabled, delays the starting of the backup
generator until the timer has elapsed. This is typically used
to prevent nuisance generator starting should minor voltage
fluctuations occur.
6.6.5 Time delay S2 fail
This feature provides a time delay to alarm that Source 2
(generator) failed to start as full voltage was not registered
on the Source 2 input.
6.6.6 Time delay engine cooldown
This feature provides a time delay of the signal to initiate the
engine/generator stop cycle after the controller transferred
back to Source 1. This allows the engine/generator to
cool down by running unloaded. Timing begins when the
controller successfully transfers back to Source 1.
6.6.7 Dual utility
This feature allows the controller to be programmed for a
dual utility system. When enabled, the controller will alarm
should the voltage on either source be disrupted. The user
will be given an option to program a preferred source. The
preferred source will be the source that the controller will
default to should both power sources be viable.