Troubleshooting
‑104‑
Problem Solution
Excessive motor noise
Increase the value of F0‑15 (Carrier frequency) by the step
value of 1.0 kHz. (Note that increasing the carrier frequency
will lead to an increase in the motor leakage current.)
Overvoltage is detected
when heavy load is
suddenly removed or
during deceleration.
Set F3‑23 (V/f overvoltage stall suppression) to 1 (Enable).
Increase the value of F3‑24/F3‑25 (Frequency gain/Voltage
gain for overvoltage stall suppression, 30 by default) by the
step value of 10 gradually. The permissible maximum value
is 100.
Decrease the overvoltage stall suppression action voltage
(F3‑22, default: 770 V) properly by the step value of 10 V. The
permissible minimum value is 700 V.
Overcurrent is detected
when heavy load is
suddenly added or during
acceleration.
Increase the overcurrent stall suppression gain (F3‑20,
default: 20) properly by the step value of 10. The permissible
maximum value is 100.
Decrease the overcurrent stall suppression action current
(F3‑18, default: 150%) properly by the step value of 10%. The
permissible minimum value is 50%.
3.2 List of Faults and Alarms
For complete information on fault and alarm codes, see
MD520 Series General‑
Purpose AC Drive Parameter Guide.
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