Hitachi SJ300 Series - Manual (Page 47)

Appendix A - Auto-tuning Procedure
Manual Adjustment of Motor Parameters
Should the performance after auto-tuning not be optimal, the various motor parameters
may be manually adjusted. The following table shows the symptoms and suggested
adjustment for various operating conditions. Observe the system and make the
adjustment indicated until acceptable performance is obtained.
Operation
Status
Symptom Adjustment Parameter
When the speed
deviation is negative
Slowly increase the motor constant
R2 in relation to auto-tuning data,
within 1 to 1.2 times preset R2
H031
Powered
running
When the speed
deviation is positive
Slowly decrease the motor constant
R2 in relation to auto-tuning data,
within 0.8 to 1 times preset R2
H031
Slowly increase the motor speed
constant R1 in relation to
auto-tuning data within 1 to 1.2
times R1
H030
Regeneration
(status with a
decelerating
torque)
When low frequency (a
few Hz) torque is
insufficient
Slowly increase the motor constant
I
0
(motor no-load current) in relation
to auto-tuning data, within 1 to 1.2
times preset I
0
value
H033
During
acceleration A sudden jerk at start of
rotation
Increase motor constant J slowly
within 1 to 1.2 times the preset
constant
H034
Decrease the speed response H05
During
deceleration
Unstable motor rotation Set motor constant J smaller than
the preset constant
H034
During torque
limiting
Insufficient torque
during torque limit at
low speed
Set the overload restriction level
lower than the torque limit level B031,
B041-B044
At
low-frequency
operation
Irregular rotation
Set motor constant J larger than the
preset constant
H034
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