Description of Fault Codes
‑54‑
Cause
Confirming Method
Solution
1. The three‑phase input
cables are connected
improperly.
Check whether the cables
between the power supply
side and R/S/T terminals of
the servo drive are
connected properly.
Replace the cables and
connect the main circuit
cables correctly.
2. A single‑phase power
supply is used for a three‑
phase servo drive.
Check the specifications of
the power supply and
measure whether the
voltage input to the main
circuit is within the following
range:
220 V servo drive:
Effective value: 220 V to 240
V
Allowable deviation: –10%
to +10% (198 V to 264 V)
380 V servo drive:
Value range: 380 V to 440 V
Allowable deviation: –10%
to +10% (342 V to 484 V)
Measure the voltages of all
the three phases.
Servo drives of 0.75 kW
(H01.02 = 5) can be supplied
by single‑phase power
supplies.
If the input voltage is within
the specified range, set
H0A.00 to 2 (Inhibit power
input phase loss fault and
warning). If it exceeds the
specified range, replace or
adjust the power supply
according to the specified
range.
3. The three‑phase power
supply is unbalanced or the
voltages of the three phases
are too low.
4. The servo drive is faulty.
The fault persists after the
main circuit (R/S/T) is
powered off and on
repeatedly.
Replace the servo drive.
● E420.1: Main circuit PL signal detection error
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