Reference; In Case You Think The Unit Is In Failure - Mitsubishi EMU4-BM1-MB User Manual

9.

Reference

This chapter explains the ways of dealing when you think the unit is in failure, Q&A, etc.

9.1 In case you think the unit is in failure

If an abnormal sound, bad-smelling smoke, fever break out from this unit, switch it off promptly and don't use it. If you think the unit is
in failure, check the following before sending for repair.
Obtained value is incompatible with other values.
Integrated electric energy value is not measured though current value is indicated.
･
･ Obtained values are different from other measuring instruments.
Check that MEA.** LED (
LED is not on, the main body is not wired or is wired incorrectly.
Check the settings of phase wire system, primary voltage and primary current.
Wrong settings may cause the incorrect measurement.
Check the polarity and wiring of the current sensor in accordance with the following procedures.
① Disconnect all current sensors, and
make sure that the current value is 0 A
while voltage is kept input in the unit.
② Connect only the side 1 of the current sensor, and check the indication.
Current
Power
③ Connect only the side 3 of the current sensor, and check the indication as stated in ②.
Check the wiring of the voltage line.
Make sure that the wires are connected correctly to P1, P2, P3 and P0 Check the wiring both on the unit side
and on the circuit connecting side.
Check whether the short circuit or disconnection is present.
Obtained values are different from other measuring instruments. (over tolerance)
Check that the measuring instrument used for comparison indicates a correct RMS value. This unit indicates an
RMS value.
If the measuring instrument used for comparison measures an average value instead of RMS value, distortion
caused by harmonic etc. in the current of the circuit to be measured causes a significant difference of values.
Current sensor connectable to the unit is the dedicated current sensor only. Check that the proper current sensor is connected or
not.
Extinction RUN LED
Please turn OFF/ON the measuring unit. Unit may be in failure if RUN LED extinction happens again.
Contact our sales representative near you.
Lighting ALM A1，ALM A2
Error is occurred. Please check the error number in display unit.
3.2Indication and function of LEDs) on the front panel of the main body is on. If the
Points to be checked
Check that I is correctly
1
measured.
Check that the electric
power is correctly
measured.
Reference
For 1P3W
W = Voltage, V ×
1-2
Current, I
1
For 3P3W
W = Voltage,V ×
1-2
Current,I × √3/2
1
35
If the current value is not 0 A, the sensor input circuit
may have been burnt out (when a general potential
transformer is directly connected), or other parts of the
unit may be defective.
Contact our sales representative near you.
If a measurement is given on the I
the sides 1 and 3 are connected contrarily.
 If the current is lower, the current sensor may be
loosely fitted.
When a minus(-) value is displayed:
Make sure that the terminals K and L of the current
sensor are connected correctly.
 Make sure that the current line is passed through the
current sensor in the correct direction. Check the
arrow direction printed on the nameplate (the arrow
mark from the power supply side to the load side).
side, the wires on
3