Mitsubishi Electric MELSEC iQ-R Series User Manual page 140

Section 8 TROUBLESHOOTING
8.2.4 If the electric current and voltage that are measured using this module do not match with the ones
measured with other gauge
Table 8.2.4-1 If current and voltage that are measured using this module do not match with the ones
Check item
Are phase wire method, primary
current, and primary voltage correct?
Does the compared gauge measure
the effective value correctly?
Is the secondary of current sensor
short-circuited?
Are you using other current sensor
than recommended ones?
measured with other gauge
Check the value in the buffer memory for checking the
phase wire method, primary current and primary
voltage. When the value in the buffer memory is
changed, you need to turn the request for operating
condition setting into ON. Otherwise, it will not be
applied to the measurement.
This module stores the effective value into the buffer
memory. If the compared device uses the average
value instead of the effective value, the resulted value
may largely differ when there is current distortion in
the measurement circuit.
Make sure that the secondary of current sensor is not
short-circuited. If it is connected to Mitsubishi's
current transformer CW-5S (L), check that the
secondary switch is not short-circuited.
Only the dedicated current sensors can be connected
to this module. Check that other company's sensor is
not being used.
139
Action
RE81WH
Reference
5.1
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