BENSHAW RSi H2 Series - Sensorless Vector Control Operation Guide

Sensorless Vector Control
244
890053-00-02
Note
Speed controller gain can improve the speed control waveform while monitoring the changes
in speed. If speed deviation does not decrease quickly, increase the speed controller P gain or
decrease I gain (time in ms). However, if the P gain is increased too high or I gain is decreased
too low, severe vibration may occur. If oscillation occurs in the speed waveform, try to increase
I gain (ms) or reduce P gain to adjust the waveform
7.1.2 Sensorless Vector Control Operation Guide
Problem
Function code
Troubleshooting
The amount of starting
torque is insufficient.
MOT-15 Tr
CON-09 PreExTime
CON-48 ACR SL P
Gain
CON-54–57 Trq Lmt
CON-93 SL Volt
Comp3
For large motors, increase CON-09. Set the value of CON-
09 to be more than 3 times the value of MOT-15.
Reduce the value of CON-48 by decrements of 10.
Increase the value of Trg Lmt (CON-54~57) by increments
of 10%.
Increase the value of CON-93 by increments of 5.
The output frequency is
higher than the base
frequency during no-load
operation at low speed
(10Hz or lower).
CON-91 SL Volt
Comp1
Decrease the value of CON-91 by decrements of 5.
The motor hunts (irregular
vibration) or the amount of
torque is not sufficient
while the load is increasing
at low speed (10Hz or
lower).
CON-04 Carrier
Freq
CON-24 ASR-SL P
Gain1
CON-25 ASR-SL I
Gain1
CON-91 SL Volt
Comp1
If the motor hunts at low speed, lower CON-24 or increase
CON-25 by increments of 50m/s. If hunting does not
occur, increase the value of CON-24 to find the optimal
operating condition.
If the amount of torque is insufficient, increase the value of
CON-91 by increments of 5.
In the 5-10Hz range, decrease the value of CON-04 by
increments of 1kHz (if CON-04 is set to exceed 3kHz).
Note that vibration may result if the set P-gain value is too
high or the set I-gain value is too low. If oscillation is
observed in the waveform, first increase the I-gain, and
then increase the P-gain to find the optimal values.
The motor hunts or
overcurrent trip occurs in
regenerative load at low
speed (10 Hz or lower).
CON-92 SL Volt
Comp2
CON-93 SL Volt
Comp3
Increase the value of CON-92 and CON-93 in increments
of 5.
Over voltage trip occurs
due to sudden
acceleration/deceleration
or sudden load fluctuation
(with no brake resistor
installed) at mid speed
(30Hz or higher).
CON-27 ASR-SL I
Gain2
Decrease the value of CON-27 by decrements of 5%.
Over current trip occurs
due to sudden load
fluctuation at high speed
(50 Hz or higher).
CON-54–57 Trq Lmt
CON-94 SL FW Freq
Decrease the values of CON-54-57 by decrements of 10%
(if the parameter setting is 150% or higher).
Increase/decrease the value of CON-94 by
increments/decrements of 5% (set below 100%).
The motor hunts when the
load increases from the
base frequency or higher.
CON-25 ASR-SL I
Gain1
CON-26 ASR-SL I
Gain2
Increase the value of CON-25 by increments of 50m/s or
decrease the value of CON-26 by decrements of 5%.
The motor hunts as the
load increases.
CON-31 S-Est P
Gain1
At low speed (10Hz or lower), increase the value of CON-
32 by increments of 5.