Omron VARISPEED G7 Instruction Manual page 230

Related Constants
Name
Con-
stant
Display
Number
Torque com- Sets torque compensation gain as
pensation gain 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-
C4-01
ues.
Torq Comp
• When the motor is oscillating,
Gain
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.
Torque com- The torque compensation delay
pensation pri- time is set in ms units.
mary delay Usually setting is not necessary.
time constant Adjust in the following circum-
stances:
C4-02
• When the motor is oscillating,
increase the set values.
Torq Comp
• When the responsiveness of the
Time
motor is low, decrease the set
values.
* The factory setting will change when the control method is changed. (Open-loop vector 1 factory settings are given.)
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.
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 without PG: 200 ms
•
V/f control with PG: 200 ms
•
Open-loop vector control: 20 ms
•
Setting
Description
Range
0.00 to
2.50
0 to
10000
Improved Operating Efficiency
Control Methods
Change
Factory during
V/f
Setting Opera-
V/f with
tion
PG
1.00 Yes A A
20 ms
No A A
*
Open Open
Flux
Loop Loop
Vec-
Vector Vector
tor
1 2
A No No
A No No
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