CHAPTER 3: OPERATION
STATUS INDICATORS
PQM POWER QUALITY METER – INSTRUCTION MANUAL
3–3
3.2
Status Indicators
3.2.1
Description
The status indicators provide a quick indication of the overall status of the PQM. These
indicators illuminate if an alarm is present, if setpoint access is enabled, if the PQM is in
simulation mode, or if there is a problem with the PQM itself.
FIGURE 3–3: STATUS INDICATORS
3.2.2
Status
•
ALARM
: When an alarm condition exists, the ALARM indicator will flash.
•
PROGRAM
: The PROGRAM indicator will be on when setpoint access is enabled.
•
SIMULATION
: The SIMULATION indicator will be on when the PQM is using simulated
values for current, voltage, analog input, switches and analog outputs. While in
simulation mode, the PQM will ignore the measured parameters detected at its inputs
and will use the simulated values stored in the
S5 TESTING \ SIMULATION
setpoints
group.
•
SELF TEST
: Any abnormal condition detected during PQM self-monitoring, such as a
hardware failure, causes the SELF TEST indicator to be on. Loss of control power to the
PQM also causes the SELF TEST indicator to turn on, indicating that no metering is
present.
3.2.3
Communicate
The COMMUNICATE indicators monitor the status of the RS485 communication ports.
When no serial data is being received through the rear serial ports terminals, the RX1/2
indicators are off. This situation occurs if there is no connection, the serial wires become
disconnected, or the master computer is inactive. If there is activity on the serial port but
the PQM is not receiving valid messages for its internally programmed address, the TX1/2
indicators remain off. This condition can be caused by incorrect message formats (such as
baud rate or framing), reversed polarity of the two RS485 twisted-pair connections, or the
master not sending the currently programmed PQM address. If the PQM is being
periodically addressed with a valid message, the RX1/2 indicator will turn on followed by
the TX1/2 indicator.
•
TX1
: The PQM is transmitting information via the COM1 RS485 communications port
when lit.
•
RX1
: The PQM is receiving information via the COM1 RS485 communications port
when lit.
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