YASKAWA Varispeed V7 Instruction Manual page 222

Trouble
The motor stops. The
torque is not output.
Cause
The stall prevention level during
acceleration is too low.
Because the stall prevention level
during acceleration (n093) is set too
low, the output current reaches the
set level, the output frequency is
stopped, and the acceleration time is
lengthened.
The stall prevention level during
running is too low.
Because the stall prevention level
during running (n094) is set too low,
the output current reaches the set
level, and the speed drops.
The load is too heavy.
If the load is too heavy, stall
prevention is activated, the output
frequency is stopped, and the
acceleration time is lengthened.
When the maximum frequency was
changed, the maximum voltage
frequency was also changed.
The V/f set value is too low.
9. Fault Diagnosis
Corrective Actions
Check if the stall prevention level
during acceleration (n093) is set to an
appropriate value.
Check if the stall prevention level
during running (n094) is set to an
appropriate value.
• Lengthen the set acceleration time
(n019).
• Reduce the load.
To increase the speed of a general-
purpose motor, only change the
maximum frequency (n011).
Set the V/f (n011 to n017) according
to the load characteristics.
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