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Checking code Meaning, detecting method Cause Checking method & Countermeasure
Open phase
error
Reverse
phase error
Check before the breaker, after the
breaker or at the power supply ter-
minal blocks TB1, and if there is an
open phase, correct the connec-
tions.
a) Check if a wire is disconnected.
b) Check the voltage between
each of the wires.
Check 1 the connections, 2, the con-
tact at the connector, 3, the tighten-
ing torque at screw tightening loca-
tions and 4 for wiring disconnec-
tions.
TB1~EN20
Refer to the circuit number and the
wiring diagram plate.
If F1, F2 or F3 on the MAIN board is
melted, (Resistance between both
ends of the fuse is ∞), replace the
fuses.
If none of the items in 1) to 4) is ap-
plicable, and if the trouble reappears
even after the power is switched on
again, replace the MAIN board
(when replacing the circuit board, be
sure to connect all the connectors,
etc. securely).
If there is reverse phase before the
breaker, after the breaker or at the
power supply terminal blocks TB1,
reconnect the wiring.
Check before the breaker, after the
breaker or at the power supply ter-
minal blocks TB1, and if there is an
open phase, correct the connec-
tions.
a) Check if a wire is disconnected.
b) Check the voltage between
each of the wires.
Check 1 the connections, 2, the con-
tact at the connector, 3, the tighten-
ing torque at screw tightening loca-
tions and 4 for wiring disconnec-
tions.
TB1~EN20
Refer to the circuit number and the
wiring diagram plate.
If F1 or F2 or F3 on the MAIN board
is melted, (Resistance between both
ends of the fuse is ∞), replace the
fuses.
If none of the items in 1) to 4) is ap-
plicable, and if the trouble reappears
even after the power is switched on
again, replace the MAIN board
(when replacing the circuit board, be
sure to connect all the connectors,
etc. securely).
4102
4103
1) Open phase has occurred in the
power supply (R, S, T).
2) The wiring is faulty.
3) The fuse is faulty.
4) The circuit board is faulty.
1) The phases of the power supply (R,
S, T) have been reversed.
2) Open phase has occurred in the
power supply (R, S, T).
3) The wiring is faulty.
4) The fuse is faulty.
5) The circuit board is faulty.
Open phase in the power sys-
tem is being detected, so op-
eration cannot be started.
Reverse phase (or open phase)
in the power system is being
detected, so operation cannot
be started.
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