YASKAWA Varispeed f7, Instruction Manual

Page: 241 / 463

6
-46
„ Related Constants
* The factory setting will change when the control method is changed. The V/f control factory setting is 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
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
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
capacity (Max. applicable
motor capacity), increase the
set values.
• 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 compen-
sation 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 215H
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
200 ms
*
No A A A No 216H