Delta VFD-BW Series, User Manual

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Chapter 5 Parameters
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VFD-BW Series
5-76 Revision May 2009, BWE0, SW V1.05
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 to 10.00 sec Factory Setting: 0.05
07 - 13 Slip Compensation Time Constant Unit: 0.01
Settings 0.05 to 10.00 sec Factory Setting: 0.10
Setting Pr.07-12 and Pr.07-13 changes the response time for the compensation.
When Pr.07-12 and Pr.07-13 are set to 10.00 sec, its response time for the compensation will
be the longest. But if the settings are too short, unstable system may occur.
07 - 14 Accumulative Motor Operation Time (Min.) Unit: 1
Settings 00 to 1439 Factory Setting: 00
07 - 15 Accumulative Motor Operation Time (Day) Unit: 1
Settings 00 to 65535 Factory Setting: 00
Pr.07-14 and Pr.07-15 are used to record the motor operation time. They can be cleared by
setting to 00 and it is not recorded when the motor operation time is less than 60 seconds.