4–25
Slip Compensation
Default Setting: V/Hz mode: 0.0 / Vector mode: 1.0
Range: 0.0 to 10.0
This parameter can be used to partially compensate for the slip inherent in
asynchronous three phase AC induction motors. An increase in load on the motor
will result in an increase in slip within the motor. When this parameter is set
above zero, the drive automatically increases the output frequency as the load
increases. The higher the parameter setting, the more aggressively the drive
increases the output frequency. The drive compares the actual output current to
the values of P0.01 (Motor Nameplate Amps) and P0.07 (Motor No-Load Current)
in order to determine the required output frequency increase.
The proper setting for P2.01 is determined by trial and error. Correct settings of
P0.01, P0.07, and P2.09 (if applicable) are important for proper operation of this
slip compensation feature.
Auto-torque Boost
Default Setting: 00
Range: 00 to 10
This parameter functions similarly to the High Starting Torque setting of the V/Hz
Settings parameter (P2.00 = 01), except that this parameter (P2.02) uses less
current. The High Starting Torque setting of P2.00 boosts starting torque by
increasing current at every start beyond what is required to move the load.
However, P2.02 Auto-torque Boost increases the current only as required to move
the load. The proper setting for P2.02 is determined by trial and error.
• This parameter only applies in V/Hz mode.
Torque Compensation Time Constant Default Setting: 0.05
Range: 00 to 10 sec
This parameter is essentially a low-pass filter which affects how Auto-Torque Boost
(P2.02) is applied. When this parameter is set to zero, Auto-Torque Boost is
applied instantaneously. When this parameter is set greater than zero, Auto-
Torque Boost is applied gradually over the time period set by this parameter.
P2.03
P2.02
P2.01
Chapter 4: AC Drive Parameters
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013
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