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5. Relay and Digital Input (PT25 only)
Description of relay operation
Function name
"The relay will close when..."
a mechanical fault occurs and is disengaged, the
Mechanical Fault Trip
mechanism position is in the open position, but there is
measurable current
a mechanism fault alarm occurs (TA fault, mechanism
Mechanical Fault Alarm
open, but there is measurable current)
electrical fault (configuration reading errors, clock faults,
Electrical Fault Alarm
watchdog faults, breaker health alarm) alarm has occurred
over-voltage trip is active and over-voltage trip has
Over-voltage Trip
occurred
over-voltage alarm is active and over-voltage alarm has
Over-voltage Alarm
occurred
under-voltage trip is active and under-voltage trip has
Under-voltage Trip
occurred
under-voltage alarm is active and under-voltage alarm has
Under-voltage Alarm
occurred
over-frequency trip is active and over-frequency trip has
Over-frequency Trip
occurred
over-frequency alarm is active and over-frequency alarm
Over-frequency Alarm
has occurred
under-frequency trip is active and under-frequency trip
Under-frequency Trip
has occurred
under-frequency alarm is active and under-frequency
Under-frequency Alarm
alarm has occurred
voltage unbalance trip is active and voltage unbalance trip
Voltage Unbalance Trip
has occurred
voltage unbalance alarm is active and voltage unbalance
Voltage Unbalance Alarm
alarm has occurred
current unbalance trip is active and current unbalance trip
Current Unbalance Trip
has occurred
current unbalance alarm is active and current unbalance
Current Unbalance Alarm
alarm has occurred
reverse power trip is active and reverse power trip has
Reverse Power Trip
occurred
reverse power alarm is active and reverse power alarm
Reverse Power Alarm
has occurred
phase sequence trip is active and phase sequence trip
Phase Sequence Trip
has occurred
phase sequence alarm is active and phase sequence
Phase Sequence Alarm
alarm has occurred
phase loss trip is active and phase loss trip has
Phase Loss Trip
occurred
phase loss alarm is active and phase loss alarm has
Phase Loss Alarm
occurred
power demand trip is active and power demand trip
Power Demand Trip
has occurred
power demand alarm is active and power demand
Power Demand Alarm
alarm has occurred
OFF
relay is disabled
5.2 Digital Input (DI)
The PT25 trip unit supports 2 sets of 220VAC digital inputs. The corresponding status value will be written upon receiving
external 220VAC signal inputs. The status value can be read via Modbus communication or through the PTM software.
20
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
"The relay will open when ...."
the fault is removed
Relevant fault is removed
Relevant fault is removed
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
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
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
relay is disabled
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