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5 External wiring of the trip unit
PXR TRIP UNITS FOR POWER DEFENSE MOLDED CASE CIRCUIT BREAKERS MN012007EN March 2019 www.eaton.com
5.3 General purpose relay mapping
The PXR family supports optional general purpose relay contacts (1 to 3 relays depending on the PXR model and the breaker
frame). Any relay in the PXR can be configured to any one of the functions. The mapping is conveniently done using the
Power Xpert Protection Manager software. Relays require auxiliary power to operate.
Function name
Description of relay operation:
"The relay will close when…" "The Relay will open when…"
Aux contact breaker is closed. breaker is open.
Bell contact breaker is tripped. breaker is not tripped (open or closed).
Trip alarm - overload there is a long or over-temperature trip. RESET button is pressed or communications reset command received.
Trip alarm - neutral current there is a neutral current trip. RESET button is pressed or communications reset command received.
Trip alarm - short delay there is a short delay trip. RESET button is pressed or communications reset command received.
Trip alarm - instantaneous there is an instantaneous trip. RESET button is pressed or communications reset command received.
Trip alarm - short circuit there is a short, inst or override trip. RESET button is pressed or communications reset command received.
Trip alarm - ground fault there is a ground fault trip. RESET button is pressed or communications reset command received.
Trip alarm - (ARMS) Maintenance
Mode
there is a Maintenance Mode trip. RESET button is pressed or communications reset command received.
Trip alarm - all trips there is any type of protective current (all the above) trip. RESET button is pressed or communications reset command received.
Alarm - high load alarm 2 current flow is greater than set point (adjustable from
50% to 120% of Ir). Note: alarm1/alarm2 LED will BLINK.
current flow falls 5% below the set point.
Alarm - high load alarm 1 current flow is greater than set point (adjustable from
50% to 120% of Ir). Note: the alarm1/alarm2 LED will ON.
current flow falls 5% below the set point.
Alarm - high temperature temperature exceeds 5C below the level of the
temperature trip setting.
temperature falls 5C below the trip setting.
Alarm -ground fault pre alarm ground current is greater than the set point (adjustable
from 50% to 100%).
ground current falls 5% below the set point.
Alarm - thermal memory the thermal memory value is >75%. the thermal memory value is <70%.
Alarm - watchdog and aux power auxiliary power is active and the trip unit is healthy and
operating.
there is an error in the trip unit from any of the self-diagnostics.
Alarm - low battery the battery is below 1 bar (25%). the battery value is 1 bar (25%) or higher.
Fault - internal there is an internal fault detected. RESET button is pressed or communications reset command received.
Fault - health the health value is below 25%. the health value is at or above 25%.
Fault -communication any external communications error occurs. RESET button is pressed or communications reset command received.
Alarm - all fault alarms any of the above 4 faults are active. all of the above four faults are inactive.
Maintenance Mode active the trip unit is in the Maintenance Mode. when the trip unit exits Maintenance Mode.
ZSI active the ZSI function active. ZSI is not active.
ZSI input received a ZSI INPUT signal is received. RESET button is pressed or communications reset command received.
ZSI output sent a ZSI OUTPUT signal is sent. RESET button is pressed or communications reset command received.
COMM open breaker pulsed an OPEN breaker command from any of the
communications channels is received.
two seconds after the OPEN breaker command is received.
Output an output ON command is received on any of the
communications channels.
an output OFF command is received on any of the communications
channels.
Additional relay operation for motor protection PXR25
Function name "The relay will close when…" "The Relay will open when…"
Trip alarm - Over Voltage voltage is greater than pickup for longer than the pickup
time (See setpoint Group 5 configuration)
RESET button is pressed or communications reset command received.
Trip alarm - Under Voltage voltage is less than pickup for longer than the pickup time
(See setpoint Group 5 configuration)
RESET button is pressed or communications reset command received.
Trip 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)
RESET button is pressed or communications reset command received.
Trip 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)
RESET button is pressed or communications reset command received.
Trip alarm - Reverse Power reverse real power is greater than the pickup for longer
than pickup time (See setpoint Group 5 configuration)
RESET button is pressed or communications reset command received.
Trip alarm - Phase Reversed phase reversed for >200ms (See setpoint Group 5
configuration)
RESET button is pressed or communications reset command received.
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