Description of Fault Codes
‑53‑
Cause
Confirming Method
Solution
The power supply is
disconnected during
operation.
Check the power input
specifications of the servo
drive and measure whether
the input voltage at the
power supply side of the
main circuit cables and R/S/
T on the drive side is within
the following range:
220 V servo drive:
Value range: 220 V to 240 V
Allowable deviation: –10%
to +10% (198 V to 264 V)
Measure the voltages of all
the three phases.
Increase the capacity of the
power supply.
Monitor the power supply
voltage and check whether
the main circuit power
supply is applied to other
devices, resulting in
insufficient power capacity
and voltage drop.
Check whether the main
circuit is wired correctly and
whether phase loss
detection (H0A.00) is hidden.
Replace the cables and
connect the main circuit
cables correctly.
Three‑phase: R, S, T
Check whether H0b.26 (Bus
voltage) is within the
following range:
220 V servo drive: H0b.26 <
200 V
380 V servo drive: H0b.26 <
380 V
The fault persists after the
main circuit is powered off
and on repeatedly.
Replace the servo drive.
● E420.0: Main circuit phase loss
Cause:
Phase loss occurs on the three‑phase servo drive.
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