GE 239 Instruction Manual page 77

CHAPTER 4: PROGRAMMING
Note
Note
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
setpoint while the motor is running, the assigned relay(s) will activate and the "CAUSE
OF TRIP: GROUND FAULT" message will be displayed.
NOTE: When the phase current increases from 0, the
START setpoint described below is used until the 239 determines whether
the motor is RUNNING or STARTING.
Refer to Section 5.2: A1: Status on page –59 for details on how the 239 detects a start
condition.
• GROUND TRIP DELAY ON START: This delay is used when the motor is in a STARTING
condition. If the ground current is equal to or above the
setpoint value and remains this way for the time delay programmed in this
PICKUP
setpoint while the motor is starting, the assigned relay(s) will activate and the "CAUSE
OF TRIP: GROUND FAULT" message will be displayed.
When the phase current increases from 0, this delay is used until the 239 determines
whether the motor is RUNNING or STARTING.
Refer to Section 5.2: A1: Status on page –59 for details on how the 239 detects a start
condition.
• GROUND ALARM: For detecting momentary ground faults due to initial insulation
breakdown and arcing, this setpoint can be set to latched. This is especially useful in
mines where moisture buildup in the windings may start to cause excessive leakage.
Any short duration ground fault will then cause a latched alarm condition. Set to
momentary if a ground fault alarm is required only while the ground current is actually
present. Ground fault alarm when enabled, will signal an alarm condition when the
ground current is greater than or equal to the value set by the
setpoint.
ALARM PICKUP
• GROUND PRIMARY ALARM PICKUP: This feature functions in a similar manner to the
ground primary trip pickup feature.
• GROUND ALARM DELAY ON RUN: This delay is used when the motor is in a RUNNING
condition. If the ground current is equal to or above the
setpoint value and remains this way for the time delay programmed in this
PICKUP
setpoint while the motor is running, the alarm relay will activate and the "GROUND
ALARM" message will be displayed.
When the phase current increases from 0,
below is used until the 239 determines whether the motor is RUNNING or STARTING.
Refer to Section 5.2: A1: Status on page –59 for details on how the 239 detects a start
condition.
• GROUND ALARM DELAY ON START: This delay is used when the motor is in a
STARTING condition. If the ground current is equal to or above the
setpoint value and remains this way for the time delay programmed in
ALARM PICKUP
this setpoint while the motor is starting, the alarm relay will activate and the "GROUND
ALARM" message will be displayed.
NOTE: When the phase current increases from 0, this delay is used until the 239
determines whether the motor is RUNNING or STARTING.
GROUND TRIP DELAY ON
GROUND PRIMARY TRIP
GROUND PRIMARY
GROUND PRIMARY ALARM
GROUND ALARM DELAY ON START
GROUND PRIMARY
described
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