21
5 External wiring of the trip unit
PXR TRIP UNITS FOR POWER DEFENSE MOLDED CASE CIRCUIT BREAKERS MN012007EN March 2019 www.eaton.com
Function name
Description of relay operation:
"The relay will close when…" "The Relay will open when…"
Trip alarm - Phase Loss phase is less than 75% of other phases for longer than
pickup time (See setpoint Group 5 configuration)
RESET button is pressed or communications reset command received.
Alarm - Over Voltage voltage is greater than pickup for longer than the pickup
time (See setpoint Group 5 configuration)
voltage falls below the setpoint
Alarm - Under Voltage voltage is less than pickup for longer than the pickup time
(See setpoint Group 5 configuration)
voltage rises above the setpoint
Alarm - Voltage Unbalance difference between the max and min voltages of all three
phases is greater than pickup for longer than the pickup
time (See setpoint Group 5 configuration)
min an max voltage difference are within pickup
Alarm - Current Unbalance difference between the max and min Current of all three
phases is greater than pickup for longer than the pickup
time (See setpoint Group 5 configuration)
min an max currents difference are within pickup
Alarm - Reverse Power reverse real power is greater than the pickup for longer
than pickup time (See setpoint Group 5 configuration)
reverse power is less than the pickup
Alarm - Phase Reversed phase reversed for >200ms (See setpoint Group 5
configuration)
phase has been corrected
Alarm - Phase Loss phase is less than 75% of other phases for longer than
pickup time (See setpoint Group 5 configuration)
phase loss has been restored
Relay Default settings:
Relay #1 - if the trip unit has ARMS then this is programmed to be Maintenance Mode Active
Relay #1 - if there is no ARMS then this relay is programmed to be Alarm - ALL TRIPS
Relay #2 - if the unit is has ground fault protection - Ground Fault Alarm (pre alarm)
Relay #2 - if the unit has no ground fault protection – Alarm HighLoad1
5.4 Neutral voltage sensor
For applications with a neutral conductor external to the circuit breaker, a small module is
provided. This module has wire leads and must be used between the neutral conductor and
the voltage sensor input to the trip unit. The neutral voltage provides a reference to accu-
rately measure voltages in “Y” connected power system.
IMPORTANT: This module contains circuitry to reduce the line voltage to levels accepted by the
trip unit. Failure to use this module for neutral sensing may cause permanent damage to the
trip unit.
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