9
Troubleshooting
QE81WH4W
9.2.3 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.
Table 9.2.3-1 If electric energy cannot be measured
Check item
“MEA.” LED
“1” “2” “3” LED
Action
Reference
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.
Wiring is not done or wrong. Refer to 7.4 to
check the wiring.
OFF
All “1”, “2” and ”3” LED are
OFF.
Voltage wiring may be incorrect. Check
connection of P1, P2, P3, and P0.
Current sensors on 1 side 2 side, and 3 side
may be installed in the reverse direction.
Check the connection.
All “1”, “2” and ”3” LED are
ON.
Voltage wiring may be incorrect. Check
connection of P1, P2, P3, and P0.
Current sensor on side 1 may be installed in
the reverse order or current sensors on side
1, side 2, and side 3 may be swapped.
Check the connection.
Only “1” is ON.
Connection between P1 and P2 or P1 and
P3 or P1 and P0 may be reserved. Check
the connection.
Current sensor on side 2 may be installed in
the reverse order or current sensors on side
1, side 2, and side 3 may be swapped.
Check the connection.
Only “2” is ON.
Connection between P1 and P2 or P2 and
P3 or P2 and P0 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
connection.
Only “3” is ON.
Connection between P2 and P3 or P1 and
P3 or P3 and P0 may be reserved. Check
the connection.
Section
7.5
ON
All “1”, “2” and ”3” LED are
OFF.
Measurement is taken normally. Check for
the correct buffer memory address and data
format (double word: 32-bit integer).
Chapter
6
9 - 4
