Improved Operating Efficiency
6-37
îš„Related Constants
* The factory setting will change when the control method is changed. The open-loop vector 1 factory settings are given.
îš„Adjusting Torque Compensation Gain
Normally, there is no need to make this adjustment. Do not adjust the torque compensation gain when using
open-loop vector control.
Adjust the torque compensation gain using V/f control in the following circumstances.
• If the cable is very long, increase the set value.
• If the (maximum applicable) motor capacity is smaller than the Inverter capacity, increase the set value.
• If the motor is vibrating, reduce the set value.
Adjust this constant so that the output current during low-speed rotation does not exceed the Inverter rated
output current range.
îš„Adjusting the Torque Compensation Primary Delay Time Constant
Set the torque compensation function primary delay in ms.
You can switch the factory settings as follows by changing the control method settings:
• V/f control: 200 ms
• V/f control with PG: 200 ms
• Open-loop vector control: 20 ms
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
C4-01
Torque com-
pensation gain
Sets torque compensation gain as
a ratio.
Usually setting is not necessary.
Adjust in the following circum-
stances:
• When the cable is long;
increase the set value.
• When the motor capacity is
smaller than the Inverter capac-
ity (Max. applicable motor
capacity), increase the set val-
ues.
• When the motor is oscillating,
decrease the set values.
Adjust the output current range at
minimum speed rotation so that it
does not exceed the Inverter rated
output current.
Do not alter the torque compensa-
tion gain from its default (1.00)
when using the open-loop vector
control method.
0.00 to
2.50
1.00 Yes A A A No No
Torq Comp
Gain
C4-02
Torque com-
pensation pri-
mary delay
time constant
The torque compensation delay
time is set in ms units.
Usually setting is not necessary.
Adjust in the following circum-
stances:
• When the motor is oscillating,
increase the set values.
• When the responsiveness of the
motor is low, decrease the set
values.
0 to
10000
20 ms
*
No A A A No No
Torq Comp
Time
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