Inertia Compensation (Closed Loop Vector Only) - Omron VARISPEED L7 Manual

Setting the AFR Time Constants (n2-02)
Parameter n2-02 sets the time constant for the AFR control. If adjustments are necessary,
Increase the setting if hunting occurs or the speed is over-compensated
•
Decrease the setting if the compensation is too slow
•
Normally there is no need to change this setting.

Inertia Compensation (Closed Loop Vector Only)

Feed Forward Control is used to eliminate the speed overshoot or undershoot by compensating inertia effects.
The function can be enabled using parameter n5-01.
Related Parameters
Parameter
No.
n5-01 Feed forward control selection
n5-02 Motor acceleration time
n5-03 Feed forward proportional gain
n5-05 Motor acceleration time auto tuning
Adjustments
Motor acceleration time (n5-02)
The motor acceleration time n5-02 is the time, which is needed to accelerate the to the rated speed with the
rated torque of the motor. The time can be estimated like follows:
Make the general setup (V/f pattern, Motor Setup, etc.)
•
Balance the elevator (car in middle position, Car weight = Counter weight)
•
Set the torque limits to 100% using the L7-
•
Set the acceleration time very short (the inverter must reach the torque limit very fast).
•
Start in any direction and measure the time from zero speed to top speed.
•
Set this time in n5-02.
•
Feed Forward Gain (n5-03)
This value usually has not to be changed.
Increase the gain to improve the responsiveness to the speed reference.
•
Decrease the gain if vibrations occur.
•
Motor Acceleration Time Auto Tuning (n5-05)
The motor acceleration time n5-02 can be calculated by an auto tuning function. It sets the internal accelera-
tion time to 0.1 sec., disabled the S-curve and sets the torque limit to 100%. After that a start in each direction
must be performed. The measured acceleration times are used to calculate the n5-03 value.
Before the n5-02 auto tuning is performed, the motor data autotuning and the general setup should have been
finished. Do the tuning with the factory settings for the n5-
Factory
Name
setting
1
0
kVA dependent
1.0
0
parameters.
Control Methods
Change
Open
during
V/f Loop
operation
Vector
No - -
No - -
No - -
No - -
parameters.
Closed
Closed
Loop
Loop
Vector
Vector
(PM)
A -
- A
A A
A A
A A
6
35
6-