GE 239 Instruction Manual page 84

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a) GENERAL
• SYSTEM STATUS: This message gives an indication if operation is normal or whether a trip and/
or alarm has occurred. Only one condition can cause a trip at a time and this will be displayed
after a trip. When alarms are present the system status will be alarm. Press
active alarm conditions and the corresponding actual value that is causing the alarm. Select the
corresponding setpoint to determine by how much the actual value exceeds the alarm setting.
• MOTOR STATUS: This message displays the current status of the motor.
• MOTOR STARTING: This message is displayed when the motor is in a START mode. The
5
START condition occurs if the average of the three phase currents rises above the full load cur-
rent setting in 6 6<67(0 6(783?02725 '$7$?02725 )8// /2$' &855(17 within 300 ms (worst case)
of initial detection of current by the 239.
• TIME TO TRIP: This message is displayed when a trip condition is in progress. The message
display time is scaled as follows:
if the trip time is
• TIME TO OVERLOAD RESET: This message displays the amount of time remaining before an
OVERLOAD TRIP is allowed to be reset. The time will become 0 when the thermal capacity
decreases to 15%.
• CAUSE OF ALARM: The appropriate alarm message is displayed when the respective alarm
condition is present. More than one alarm message can be present at once.
b) LAST TRIP DATA
After a trip, all conditions present at the time of trip and the cause of trip are saved in non-volatile
memory. In addition, a trip record of the last 5 causes of trip is also retained for diagnosing persistent
problems.
• CAUSE OF LAST TRIP: Only one condition at a time will cause a trip. The most recent cause of
trip is displayed.
• A: B: C: CURRENT: Actual current flowing in each of the three phases at the moment of trip is
displayed. By comparing these values to the motor full load current after an overload trip, it
should be easy to determine in which phase the fault has occurred. A high current in one phase
and ground indicates a phase to ground fault. A high current in 2 phases suggests a phase to
phase fault. High current in all three phases indicates a running overload or possible short circuit.
5-4
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MESSAGE 3
Figure 5–2: ACTUAL VALUES PAGE 1 – STATUS
> 10.0 minutes, the display will be 'xxx.x MINUTES'
≤ 10.0 minutes, the display will be 'xxx.x SECONDS'
239 Motor Protection Relay
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GE Multilin