Description of Fault Codes
‑49‑
In applications where the motor drives a vertical axis or is driven by the load, set H0A.12 to
0 to hide the runaway fault.
● E400.0: Main circuit overvoltage
Cause:
The DC bus voltage between P⊕ and N⊖ exceeds the overvoltage threshold.
220 V servo drive: Normal value: 310 V Overvoltage threshold: 420 V
380 V servo drive: Normal value: 540 V Undervoltage threshold: 760 V
Cause
Confirming Method
Solution
1. The voltage input to the
main circuit is too high.
Check the power input
specifications of the servo
drive and measure whether
the voltage input to main
circuit cables (R/S/T) on the
drive side 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)
Replace or adjust the power
supply according to the
specified range.
2. The power supply is
unstable or affected by
lightning.
Check whether the power
supply is unstable, affected
by lightning, or complies
with the preceding range.
Connect a surge protection
device and then switch on
the main circuit and control
circuit power supplies again.
If the fault persists, replace
the servo drive.
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