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5 Troubleshooting
5
Fault Code Name Possible Causes Solution Level
Err20
Speed feedback
incorrect
Subcode 1: The
encoder signal is
not detected during
synchronous motor no-
load auto-tuning.
ā¢ Check whether the encoder signal circuit is
normal.
ā¢ Check whether the PG card is normal.
ā¢ Check whether the brake is released.
5A
Subcode 4: Z signal
is not detected during
synchronous motor
auto-tuning.
ā¢ Check whether the encoder signal circuit is
normal.
ā¢ Check whether the PG card is normal.
Subcode 5: The
cables of the SIN/COS
encoder break.
Subcode 7: The cables
of the UVW encoder
break.
Subcode 14: Z signal
is lost during normal
running.
Subcode 2, Subcode
8: reserved
-
Subcode 3, Subcode
15: The phase
sequence of the motor
is incorrect.
ā¢ Exchange any two phases of the motor UVW
cables.
ā¢ Check whether the brake is released in
synchronous motor with-load auto-tuning
mode.
Subcode 9: The speed
deviation is too large.
The angle of the synchronous motor is abnormal.
Perform motor auto-tuning again.
KP The position lock speed loop Kp value is
excessive. Decrease this value.
The speed loop proportional gain is small or
integral time is large. Increase the proportional
gain or decrease the integral time properly.
Check whether the motor phase sequence is
correct.
Subcode 12: The
encoder AB signals are
lost at startup.
ā¢ Check whether the brake is released.
ā¢ Check whether AB signal cables of the
encoder break.
If the motor cannot be started at the slip
experiment, perform the slip experiment by using
the function set in F3-24.
Subcode 13: The
encoder AB signals are
lost during running.
AB signals of the encoder become lost suddenly.
Check:
ā¢ Whether encoder wiring is correct
ā¢ Whether strong interference exists
ā¢ Whether the motor is stuck due to sudden
power failure of the brake during running.
Subcode 19: The
signals of the SIN/COS
encoder are seriously
interfered with during
running.
The encoder analog signals are seriously
interfered with during motor running, or encoder
signals are in poor contact. You need to check
the encoder circuit.
Subcode 55: The
signals of the SIN/COS
encoder are seriously
interfered with or CD
signals are incorrect
during motor auto-
tuning.
The encoder analog signals are seriously
interfered with during motor auto-tuning, or
encoder CD signals are in wrong sequence.
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