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Hardware description
EPCT FirE sEriEs FirE PumP ConTrollEr
MN124016EN August 2019 www.eaton.com
3.0 Hardware description
3.1 General
The purpose of this section is to familiarize the reader with
the EPCT controller hardware, its nomenclature, and to list
the unit’s specifications.
3.2 Display board
The display board is accessible from the outside of the door.
The front panel provides a means to:
•
Alert the user to specific conditions
•
Program the controller
•
Set and monitor the operating parameters
3.2.1 Memory
The EPCT has non-volatile memory which allows the
recording and storage of up to 65,000 events.
3.2.2 Battery backup
A ten (10) year, replaceable lithium battery allows a time
clock to be kept during power failures. Removal of the
battery does not affect programming.
3.2.3 Color touchscreen specifications
Aspect Ratio: 5:3
Resolution: 800x480 WQVGA
Type: LCD display
Viewing Area: 7 inches diagonal
Rating: NEMA 4/4X
3.2.4 USB port
The USB port located on the door is meant for downloading
the controller message history, statistics, diagnostics,
startup, and configuration files. The controller firmware can
be uploaded and the controller configuration can be both
uploaded and downloaded. Compatible USB flash drive
formats include FAT16 & FAT32.
3.3 Power I/O board
The Power I/O board is used for all connections pertaining
to the operation of the controller. From the remote inputs,
starting conditions, and the alarm relay outputs.
Refer to the schematic diagram mounted on the inside
of the controller door for all connection points specific to
the controller.
3.4 ATS board (if equipped)
The ATS board is used for all connection points pertaining
only to the automatic transfer switch. These connection
points control the starting of the backup engine/generator,
and output relay for Source 2 Disconnected.
Refer to the schematic diagram mounted on the inside
of the controller door for all connection points specific to
the controller.
3.5 Main isolating switch/circuit interrupter
The main isolating switch (MIS) is intended for isolating
an electric circuit from its source of power. It has no
interrupting rating and must be externally operable.
The circuit interrupter (CB) is used to disconnect a
running pump motor, if necessary. The CB also provides
short circuit protection for the controller and the pump
motor and operates in conjunction with the Locked Rotor
Protector (LRP). In case of a short circuit the CB will trip
instantaneously. In the case of seizure of the pump or
motor while starting or running the LRP will trip the CB,
via a shunt trip, within twenty (20) seconds, as per NFPA
20 standards.
When necessary, a current limiter attachment may
be mounted on the bottom of the CB to increase the
interrupting capacity.
If one or more of the current limiter fuses blows, the cause
must be repaired immediately and new current limiters
installed when repairs are complete.
The isolating switch and circuit interrupter are interlocked
such that the enclosure door cannot be opened with the
handle in the On position, except by qualified electrical
personnel. This is accomplished by the use of a defeater
screw located on the side of the operator handle.
ote:
N
The isolation switch is not required on Limited
Service controllers. A circuit breaker with a magnetic-
only trip setting will be used.
3.6 Contactor(s)
The contactor(s) (M, in full voltage and soft start controllers;
1M and 2M, in part winding; M and A, in primary resistor;
R, S and Y, in autotransformer; 1M, 2M, 1S and 2S, in
wye-delta) connect the pump motor to the supply, under
control of the pressure sensor, start pushbutton, remote
starting inputs, or emergency handle.
The contactor coil(s) are connected to the supply voltage
of the controller. If a replacement coil is ever required, the
correct voltage must be ordered.
