Description of Fault Codes
‑41‑
Cause:
The MCU monitors the 5 V power supply of the PWM Buffer to detect whether
overvoltage or undervoltage occurs. If the voltage is abnormal, E150.2 occurs.
Cause
Confirming Method
Solution
The 5 V voltage supplied to
the STO Buffer is abnormal
due to undervoltage or
overvoltage.
Check whether the fault can
be removed by a restart. If
not, the 5V voltage supplied
to the Buffer is abnormal.
Replace the servo drive.
● E150.3: STO input circuit hardware diagnosis failure
Cause:
Short circuit occurs on the optocoupler of the upstream hardware circuit of STO.
Cause
Confirming Method
Solution
The upstream optocoupler
of STO1 or STO2 failed.
The fault persists when the
24 V power supply is
powered off and on again.
The drive displays E150.3.
Replace the servo drive.
● E150.4: PWM buffer hardware diagnosis failure
Cause:
An error occurs on the PWM Buffer integrated circuit during initialization detection
upon power‑on (the PWM signal cannot be blocked).
Cause
Confirming Method
Solution
STO Buffer power‑on test
error
The fault persists when the
24 V power supply is
powered off and on again.
The drive displays E150.4.
Replace the servo drive.
● E201.0: Phase‑P overcurrent
Cause:
An excessively high current flows through the positive pole of the DC‑AC circuit.
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