Motor Slip Compensation Gain Adjustment Procedure; Slip Compensation Primary Delay Time: C3-02; Slip Compensation Limit: C3-03 - YASKAWA VARISPEED-616G5 Instruction Manual

Advanced Operation
7.5.2 Tuning Constants: C
7

Motor Slip Compensation Gain Adjustment Procedure

1. Correctly set the motor rated slip (constant E2-02) and the motor no-load current (constant E2-03).
The motor rated slip can be calculated by means of the following equation, using the numbers that
•
are shown on the motor nameplate.
Motor rated slip =
Motor rated frequency (Hz) − rated speed (r/min) x motor (No. of poles) / 120
Set the values at the rated voltage and rated frequency for the motor no-load current. With vector
•
control, the motor rated slip is automatically set by autotuning.
2. Set the slip compensation gain (constant C3-01 to "1.0." (If it is set to "0.0," slip compensation will
be disabled.)
3. Operate with a load, measure the speed, and adjust the slip compensation gain (in increments of 0.1).
If the speed is lower than the target value, increase the slip compensation gain.
•
If the speed is higher than the target value, decrease the slip compensation gain.
•

Slip Compensation Primary Delay Time: C3-02

User User
Constant Name
Number
Slip compensation
C3-02
primary delay time
* When the control method is switched, the values change as follows:
V/f control: 2,000; open-loop vector: 200
This constant does not normally need to be set. Adjust the slip compensation primary delay time if the
D
motor slip compensation responsiveness is low, or if the speeds are unstable.
If responsiveness is low, lower the setting.
•
If speeds are unstable, raise the setting.
•

Slip Compensation Limit: C3-03

User User
Constant Name
Number
Slip compensation
C3-03
limit
Constant C3-03 sets the slip compensation limit as a percentage of motor rated slip (E2-02), with the
D
motor rated slip taken as 100%.
If the speed is lower than the target value and does not change even when the slip compensation gain
D
is adjusted, it is possible that the slip compensation limit has been reached. Raise the limit and then
check again. Make sure, however, that the value of the sum of the reference frequency and the slip com-
pensation limit does not exceed the speed capacity of the machinery.
The limit is as shown in Figure 7.28 in the constant torque and constant output areas.
D
Slip compensation limit
E1-04
× C3-03
E1-06
C3-03
Fig 7.28 Slip Compensation Limit
Slip Compensation Selection During Regeneration: C3-04
User User
Constant Name
Number
Slip compensation
C3-04
selection during re-
generation
Change g
Setting Setting Unit Factory
during during
Range
Opera-
tion
0 to 10000 ms
×
Change g
during during Setting Setting Unit Factory
Opera- Range
tion
0 to 250 %
×
E1-06 E1-04
E1-06: Base frequency
E1-04: Maximum output frequency
Change g
during during Setting Setting Unit Factory
Opera- Range
tion
0, 1 −
×
7 - 54
Valid Access Levels
Factory
Open
V/f V/f with
Setting
Loop
Control PG
Vector
200 * A A
×
Valid Access Levels
Factory
Open
V/f V/f with
Setting
Loop
Control PG
Vector
A A
200
×
Output frequency
Valid Access Levels
Factory
Open
V/f V/f with
Setting
Loop
Control PG
Vector
A A A
0
Flux
Vector
×
Flux
Vector
×
Flux
Vector
×