Learning Advanced Features
5.10.2 Sensorless Vector Control Operation Guide for Induction Motors
The amount of starting
torque is insufficient.
bA.24 Tr
Cn.09 PreExTime
Cn.10 Flux Force
Cn.31 ACR SL P Gain
Cn.54–57 Trq Lmt
Cn.93 SL Volt Comp3
Set the value of Cn. 90 to be more than 3 times
the value of bA.24 or increase the value of Cn.10
by increments of 50%. If the value of Cn.10 is
high, an overcurrent trip at start can occur. In
this case, reduce the value of Cn.31 by
decrements of 10.
Increase the value of Trg Lmt (Cn.54-57) by
increments of 10%.
Increase the value of Cn.93 by increments of 5.
higher than the base
frequency during no-load
operation at low speed
Cn.91 SL Volt Comp1 Decrease the value of Cn.91 by decrements of 5.
The motor hunts or the
amount of torque is not
sufficient while the load is
increasing at low speed
(10Hz or lower).
Cn.04 Carrier Freq
Cn.21 ASR-SL P Gain1
Cn.22 ASR-SL I Gain1
Cn.93 SL Volt Comp3
If the motor hunts at low speed, increase the
value of Cn.22 by increments of 50m/s, and if
hunting does not occur, increase the value of
Cn.21 to find the optimal operating condition.
If the amount of torque is insufficient, increase
the value of Cn.93 by increments of 5.
If the motor hunts or the amount of torque is
insufficient in the 5-10Hz range, decrease the
value of Cn.04 by increments of 1kHz (if Cn.04 is
overcurrent trip occurs in
regenerative load at low
Cn.92 SL Volt Comp2
Cn.93 SL Volt Comp3
Increase the value of Cn.92-93 by increments of
5 at the same time.
Over voltage trip occurs due
to sudden
acceleration/deceleration or
sudden load fluctuation
(with no brake resistor
installed) at mid speed
Cn.24 ASR-SL I Gain2
Decrease the value of Cn.2 by decrements of
5%.
Over current trip occurs due
to sudden load fluctuation
at high speed (50 Hz or
higher).
Cn.54–57 Trq Lmt
Cn.94 SL FW Freq
Decrease the value of Cn.54-57 by decrements
of 10% (if the parameter setting is 150% or
Increase/decrease the value of Cn.94 by
increments/decrements of 5% (set below
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