Delta C2000 Series User Manual page 387

Chapter 12 Description of Parameter Settings
Slip Compensation Gain (V/F and SVC control mode)
Settings
The induction motor needs the constant slip to produce magnetic torque. It can be ignore in the
higher motor speed, such as rated speed or 2-3% slip.
In the operation with variable frequency, the slip and the synchronous frequency will be in
reverse proportion to produce the same magnetic torque. That is the slip will be larger with the
reduction of synchronous frequency. The motor may stop when the synchronous frequency is
decreased to a specific value. Therefore, the slip serious affects the accuracy of motor speed at
low speed.
In another situation, when the drive uses with induction motor, the slip will be increased by the
increasing load. It also affects the accuracy of motor speed.
This parameter can be used to set compensation frequency and reduce the slip to close the
synchronous speed when the motor runs in the rated current to raise the drive accuracy. When
the drive output current is larger than Pr.05-05 No-load Current of Induction Motor 1 (A), the
drive will compensation the frequency by this parameter.
When the control method (Pr.00-11) is changed from V/f mode to vector mode, this parameter
will auto be set to 1.00. Otherwise, it will be set to 0.00. Please do the compensation of slip after
overload and acceleration. The compensation value should be increased from small to large
gradually. That is to add the output frequency with motor rated slip X Pr.07-27 Slip
Compensation Gain when the motor is rated load. If the actual speed ratio is slow than
expectation, please increase the setting. Otherwise, decrease the setting.
Reserved
Slip Deviation Level
Settings
Detection Time of Slip Deviation
Settings
Over Slip Treatment
Settings
The Pr.07-29 to Pr.07-31 are to set allowable slip level/time and over slip treatment when the
drive is running.
0.00~10.00
0~100.0%
0: No detection
0.0~10.0 sec
0: Warn and keep operation
1: Warn and ramp to stop
2: Warn and coast to stop
3: No warning
12.1-07-9
Factory Setting: 0.00
Factory Setting: 0
Factory Setting:1.0
Factory Setting:0