Chapter 8 Maintenance & Troubleshooting
May issue
Possible cause
Possible solution
The device has no
display after adding the
control power
Power was not added to the
device
Check whether the correct operating voltage is applied to
the L/+ and N/- terminals of the device.Check whether
the control power insurance is not burnt out
The measurements are
incorrect or do not
conform to expectations
The voltage is not measured
correctly
Check whether the neutral connection is reliable
Check whether the measured voltage matches the rated
parameters of the equipment
Check whether the PT variable ratio parameter is set
correctly
The current is not measured
correctly
Check whether the measured current matches the rated
parameters of the equipment
Check whether the CT variable ratio parameter setting is
correct
The power measurement is
incorrect
Check whether the measurement mode Settings are
correct
Check if the voltage and current phase sequence is correct
Check if current namesake terminal is wrong
The switch state does
not change
The switch voltage is not correct
Check whether the external node type matches the device
rating parameters
Check if the external wiring is correct
The upper machine
cannot
communicate
with the device
The
device
communication
address is incorrect
Check whether the device address is consistent with the
definition
The device communication rate
is not correct
Check whether the device communication rate is
consistent with the definition
The communication link is not
connected to terminal resistance
Check if 120 ohm resistance is added
The communication link is
disturbed
Check whether the communication shield is well
grounded
Communication line outage
Check whether the communication cable is disconnected