Keys - GE 239 Instruction Manual

3.1.4

Keys

3–4
Courtesy of NationalSwitchgear.com
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
COMMUNICATE indicator will be off. This situation will occur if there is no
the
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
COMMUNICATE indicator will be on continuously. If no valid
a valid message, the
message has been received for 10 seconds, the indicator will either flash (serial
data present) or go off (no serial data).
ACTUAL
SETPOINT
STORE
RESET
• SETPOINT: Setpoints are arranged into groups of related messages called setpoint
pages. Each time the
SETPOINT
message of the next page of setpoints. Pressing the
middle of a page of setpoints advances the display to the beginning of the next
page. The and
MESSAGE
within a page.
• ACTUAL: Measured values and collected data messages are arranged into groups
of related messages called actual values pages. Each time the
pressed, the display advances to the first message of the next page of actual
values. Pressing the
ACTUAL
advances the display to the beginning of the next page. The
keys are used to move between messages within a page.
MESSAGE
MESSAGE
VALUE
FIGURE 3–4: FRONT PANEL KEYS
key is pressed, the display advances to the first
keys are used to move between messages
MESSAGE
key while in the middle of a page of actual values
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
CHAPTER 3: OPERATION
819764A4.CDR
key while in the
SETPOINT
key is
ACTUAL
and
MESSAGE