Field Forcing - Omron VARISPEED L7 Manual

Related Parameters
Parameter
No.
S2-01
S2-02
S2-03
S3-05
S3-06
S2-07
Adjustments
The Slip compensation values can be set separately for motoring and regenerative operation. Before adjusting
this function the general setup should have been done (Motor Setup, V/f pattern, Speeds, ASR settings etc.).
To adjust the Slip compensation function do the following in motoring and regenerative mode:
Set the motor speed in S2-01 if V/f control is used.
•
Try to measure the actual motor speed during leveling.
•
If the motor speed is lower than the leveling speed reference increase S2-02 in motoring mode or decrease
•
S2-03 in regenerative mode.
If the motor speed is higher than the leveling speed reference decrease S2-02 in motoring mode or increase
•
S2-03 in regenerative mode.
S2-05 and S2-06 should not be modified, except if the stop accuracy is poor and the constant speed time
•
after the speed agree is shorter than S2-05 + S2-06.
6

Field Forcing

The field forcing function controls the motor flux and compensates the flux establishment delay of the motor.
Thereby it improves the motor responsiveness to changes in the speed reference or the load.
Field forcing is applied during all operation conditions except DC Injection.
Using parameter d6-06 a field forcing limit can be applied. A setting of 100% is equal to the no-load current
set in parameter E2-03.
Related Parameters
Parameter
No.
d6-03
d6-06
38
6-
Name
Motor Rated rpm
Slip Compensation Gain at Motoring
Slip Compensation Gain at Regenerating
Slip Compensation Torque Detection Delay
Slip Compensation Torque Detection Time
Slip Compensation primary Delay Time
Name
Field forcing selection
Field forcing limit
Change
Factory
during V/f
setting
operation
1380rpm No A
0.7 No A
1.0 No A
1.0 sec. No A
0.5 sec. No A
200ms No -
Change
Factory
during
Setting
V/f
Operation
0 No
400% No
Closed
Open Closed
Loop
Loop Loop
Vector
Vector Vector
(PM)
- - -
A - -
A - -
A - -
A -
A - -
Control Methods
Closed
Open Closed
Loop
Loop Loop
Vector
Vector Vector
(PM)
- A A -
- A A -