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5. Relay and Digital Input (PT25 only)
5.1 Relay Configuration
There are 3 relay modules integrated in the PT25 frame module which are used to indicate status information to other systems.
Refer to Section 8 to know details about relay connections on the terminal block. Note that relays require auxiliary power to
operate. The relays are rated at 6A and 250Vac, so please pay attention to release parameters when in use with the shunt
release and closing release for remote control.
The relays can be configured to conditions in below table. Configuration is conveniently done using Power Trip Protection
Manager software. Pick-up levels for High Load 1 Alarm, High Load 2 Alarm, Ground Fault Early Warning and Thermal Memory
Alarm are also adjustable. The software is available as a download from the following link: www.eaton.com.cn/PTM.
Description of relay operation
Function name
"The relay will close when..."
Overload Trip
there is a Long or Over-temperature trip
Neutral Trip
there is a Neutral Current trip
Short Delay Trip
there is a Short Delay trip
Instantaneous Trip
there is an Instantaneous trip or MCR trip
Short Circuit Trip
there is a Short, Inst or High Inst trip
Ground Fault Trip
there is a Ground Fault trip
any of protective trip (Overload, Neutral, Short Delay,
All Trips
Instantaneous, Ground)
current flow is greater than set point (adjustable from
High Load 1
50% to 120% of I
current flow is greater than set point (adjustable from
High Load 2
50% to 120% of I
temperature exceeds 5 below the level of the
Over Temperature Alarm
temperature trip setting
ground current is greater than the set point (adjustable
Ground Fault Early Warning
from 50% to 100%)
the Thermal Memory value is greater than set point
Thermal Memory
(adjustable from 50% to 100%)
auxiliary power is active and the trip unit is healthy and
Watchdog
operating
Low Battery
the battery is below 1 bar (20%)
Internal (HW) Fault
there is an internal fault detected
a setpoint in the trip unit does not match the CAM's
Setpoint Mismatch
configuration
Breaker Health Alarm
the health value is at or above the set point
Communication Error
any external communications error occurs
any of Internal Fault, Setpoint Mismatch, Breaker Health
All Faults
Alarm, or Communication Error faults
Aux Contact
breaker is closed
Trip Contact
breaker is tripped
ZSI Active
the ZSI function active
ZSI Input Received
a ZSI INPUT signal is received
ZSI Output Sent
a ZSI OUTPUT signal is sent
an OPEN breaker command from any of the
Open Breaker Pulse
communications channels is received
a CLOSE breaker command from any of the
Close Breaker Pulse
communications channels is received
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5. Relay and Digital Input (PT25 only)
"The relay will open when ...."
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
current flow falls 5% below the set point
current flow falls 5% below the set point
temperature falls 5ºC below the setting
ground current falls 5% below the set point
Thermal Memory falls 5% below the set point
there is an error detected in the trip unit from any of the self-diagnostics
the battery value is 1 bar (20%) or higher
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
the health value is below the set point
RESET button is pressed or communications reset command received
all of Internal Fault, Setpoint Mismatch, Breaker Health Alarm, or Communication
Error are inactive
breaker is open
breaker is not tripped (it is open or closed)
ZSI is not active
RESET button is pressed or communications reset command received
RESET button is pressed or communications reset command received
2 seconds after the OPEN breaker command is received
2 seconds after the CLOSE breaker command is received
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
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