Mitsubishi Electric MELSEC iQ-R Series User Manual page 139

Section 8 TROUBLESHOOTING
8.2.3 If electric energy cannot be measured
The following check has to be performed while current is flowing from the power source side to the load side.
Check item
"MEA." LED "R" LED
OFF OFF
ON
ON OFF
or
ON
OFF
Table 8.2.3-1 If electric energy cannot be measured
"1" "3" LED
The type of current sensor may be incorrect.
In addition, if the rating of the used sensor is
different from the primary current,
measurement cannot be taken correctly.
Both "1" and "3"
LED are OFF. Wiring is not done or may be wrong. Refer to
"6.3 Wiring" to check the wiring.
Voltage wiring may be incorrect. Check
connection of P1, P2, and P3.
Current sensors on both 1 side and 3 side
may be installed in the reverse direction.
Both "1" and "3"
Check the connection.
LED are ON.
Voltage wiring may be incorrect. Check
connection of P1, P2, and P3.
Current sensor on side 1 may be installed in
the reverse order or current sensors on side 1
Only "1" LED and side 3 may be swapped. Check the
is ON. connection.
Connection between P1 and P2 or P1 and P3
may be reserved. Check the connection.
Current sensor on side 3 may be installed in
the reverse order or current sensors on side 1
and side 3 may be swapped. Check the
Only "3" LED
connection.
is ON.
Connection between P2 and P3 or P1 and P3
may be reserved. Check the connection.
Measurement is taken normally. Check for the
Both "1" and "3"
correct buffer memory address and data
LED are OFF.
format (double word: 32-bit integer).
Action
138
RE81WH
Reference
6.3
Section 5