Keys - GE 239 Instruction Manual

3 OPERATION
• SERVICE: Any abnormal condition detected during 239 self-monitoring, such as a hardware fail-
ure, will cause the
operated state is "Energized," operated state is "De-energized"). The
6(59,&(
on while the
also causes the
• PICKUP: During testing, for calibration verification, it is useful to have an indication of when the
motor full load or ground trip pickup setting has been exceeded. Eventually an alarm or a trip will
occur if these conditions persist. The indicator will remain flashing as long as the motor full load
setting remains exceeded while the motor is running or ground current is above the ground trip
pickup level. The indicator will automatically turn off when the phase current drops below the full
load threshold and the ground current is below the trip pickup setting.
• COMMUNICATE: Status of the RS485 communication port is monitored with this indicator. If
there is no serial data being received via the rear serial port terminals the
cator will be off. This situation will occur if there is no connection, the serial wires have become
disconnected or the master computer is inactive. If there is activity on the serial port but the 239
is not receiving valid messages for its internally programmed address the indicator will flash. This
could be caused by incorrect message format such as baud rate or framing, reversed polarity of
the two RS485 twisted pair connections or the master not sending the currently programmed 239
address. If the 239 is being periodically addressed with a valid message, the
indicator will be on continuously. If no valid message has been received for 10 seconds, the indi-
cator will either flash (serial data present) or go off (no serial data).
• SETPOINT: Setpoints are arranged into groups of related messages called setpoint pages. Each
time the SETPOINT
setpoints. Pressing the
display to the beginning of the next page. The
between messages within a page.
• ACTUAL: Measured values and collected data messages are arranged into groups of related
messages called actual values pages. Each time the
GE Multilin
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6(59,&(
relay to operate. This relay is programmed to be failsafe (i.e. non-
relay is operating (i.e. de-energized). Loss of control power to the 239
6(59,&(
relay to be de-energized, indicating that no protection is present.
ACTUAL
SETPOINT
STORE
RESET
Figure 3–4: FRONT PANEL KEYS
key is pressed, the display advances to the first message of the next page of
SETPOINT key while in the middle of a page of setpoints advances the
239 Motor Protection Relay
6(59,&(
MESSAGE
VALUE
819764A4.CDR
and
MESSAGE MESSAGE
key is pressed, the display
ACTUAL
3 OPERATION
indicator will turn
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indi-
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3.4 KEYS

keys are used to move
3-3
3