Description of Fault Codes
‑37‑
Cause
Troubleshooting
Solution
1. STO input power supply is
abnormal.
Check whether the STO
power supply is normal.
Check whether the 24 V
power supply for the STO is
stable. Tighten the cables
that are loose or
disconnected.
2.STO input resistor is
abnormal.
After STO is triggered, only
one STO signal is sent to
MCU after the 24 V power
supply is cut off due to input
resistor drift.
Replace the servo drive.
3. STO is ineffective
The fault persists after
preceding causes are
rectified.
Replace the servo drive.
● E150.2: Buffer 5 V voltage detection error
Description:
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
Troubleshooting
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
Description:
Short circuit occurs on the optocoupler of the upstream hardware circuit of STO.
Cause
Troubleshooting
Solution
Short circuit occurs on the
upstream optocoupler of
STO1 or STO2.
The fault persists and the
keypad displays E150.3 after
restart.
Replace the servo drive.
● E150.4: PWM buffer hardware detection failure
Description:
An error occurs on the PWM Buffer integrated circuit during initialization detection
upon power‑on (the PWM signal cannot be blocked).
Cause
Troubleshooting
Solution
STO Buffer power‑on test
error
The fault persists and the
keypad displays E150.4 after
restart.
Replace the servo drive.
● E201.0: Phase‑P overcurrent
Description:
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