Delta VFD007B21A - Motor Line-To-Line Resistance; Motor Rated Slip; Slip Compensation Limit; Torque Compensation Time Constant

Chapter 5 Parameters_VFD-B Series
Revision 10/2005, BE13, SW V4.08 5-81
07 - 06
Motor Line-to-line Resistance R1 Unit: 1
Settings
00 to 65535 m:
Factory Setting: 00

The motor auto tune procedure will set this parameter. The user may also set this parameter without using
Pr.07-05.
07 - 07
Reserved
07 - 08
Motor Rated Slip Unit: 0.01
Settings 0.00 to 20.00Hz Factory Setting: 3.00

Refer to the rated rpm and the number of poles on the nameplate of the motor and use the following
equation to calculate the rated slip.
Rated Slip (Hz) = F
base
(Pr.01-01 base frequency) – (rated rpm x motor pole 120)

This parameter is valid only in vector mode.
07 - 09
Slip Compensation Limit Unit: 1
Settings 00 to 250% Factory Setting: 200

This parameter sets the upper limit of the compensation frequency (the percentage of Pr.07-08).
Example: when Pr.07-08=5Hz and Pr.07-09=150%, the upper limit of the compensation frequency is 7.5Hz.
Therefore, for a 50Hz motor, the max. output is 57.5Hz.
07 - 10
Reserved
07 - 11
Reserved
07 - 12
Torque Compensation Time Constant Unit: 0.01
Settings 0.01 ~10.00 sec Factory Setting: 0.05
07 - 13
Slip Compensation Time Constant Unit: 0.01
Settings 0.05 ~10.00 sec Factory Setting: 0.10

Setting Pr.07-12 and Pr.07-13 changes the response time for the compensation.