YASKAWA Varispeed G7 Series Instruction Manual page 272

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;
• When the motor capacity is
C4-01
Torq Comp
• When the motor is oscillating,
Gain
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 vector1
control method.
Torque com- The torque compensation delay
pensation pri- time is set in ms units.
mary delay time Usually setting is not necessary.
constant Adjust in the following circum-
stances:
C4-02
• When the motor is oscillating,
Torq Comp
• When the responsiveness of the
Time
* The factory setting will change when the control method is changed. The 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: 200 ms
•
V/f control with PG: 200 ms
•
Open-loop vector control: 20 ms
•
Setting
Description
Range
increase the set value.
smaller than the Inverter capac-
ity (Max. applicable motor
capacity), increase the set val- 0.00 to
ues. 2.50
decrease the set values.
0 to
10000
increase the set values.
motor is low, decrease the set
values.
Improved Operating Efficiency
Control Methods
Change
Open
Factory during
V/f
Loop
Setting Opera-
V/f with
Vector
tion
PG
1
1.00 Yes A A A
20 ms
No A A A
*
MEMO
Open
BUS
Flux
Loop
Regis-
Vec-
Vector
ter
tor
2
No No 215H
No No 216H
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