6. Control Functions and Parameter Settings
6-35
A02-3
Square reduction torque setting [%]
Set the reduction torque at the base
frequency (B00-5)/2 as a percentage
in respect to the rated output voltage
(B00-3)
(Note) When both A02-2 and A02-3 are set, the voltage will be added as shown above.
A02-4
R1 drop compensation gain [%]
This setting compensates the voltage drop caused by R1. Normally set to 50%.
The motor primary resistance R1 must be properly adjusted by the Auto-tuning.
(Note 1)
If set too high, the rotation become unstable and the drive may trip.
(Note 2)
If set too low, the torque may not be sufficient.
A02-5
Slip compensation gain [%]
This is automatically set by auto-
matic tuning.
When setting manually, set the
slip frequency for the motor rated
load as a percentage in respect to
the base frequency (B00-5).
The output frequency changes
according to the motor rated
torque as shown below.
(Note 1)
The slip compensation will not function in respect to the regenerative torque.
(Note 2)
The output frequency will respond with a time constant of approx. 500ms in
respect to the changes in the load torque.
(Note 3)
When set too high, the motor rotation could become unstable.
A02-6
Maximum torque boost gain [%]
This is automatically set by automatic tuning.
The optimum boost value for outputting the maximum torque is set as a percentage in
respect to the rated output voltage (B00-3).
Normally, a value of 10 to 30% is set by automatic tuning.
(Note 1)
When adjusted manually, the sufficient torque may not be attained.
(Note 2)
If set too high, the rotation may become unstable and may trip.
A 0 2-2
A 0 2-3
Fre q ue ncy
B a se
fre qu e ncy/2
O
u
tp
ut
V
o
lt
ag
e
B a se
fre qu e ncy
(B 0 0-5)
O utpu t F req u en cy
L oa d To rqu e
