Magnetek IMPULSE VG+ Series 3, Instruction Manual

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IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-45
Automatic Slip Compensation
As the load becomes larger, the motor speed is reduced and the motor slip increases. The slip
compensation function keeps the motor speed constant under varying load conditions. D2-01 sets the
slip compensation gain. When the gain is “1.0”, the output frequency is increased by 1% of the E1-
06 setting at rated current. A setting of “0.0” results in no slip compensation.
Automatic Speed Regulator (ASR) Tuning
Parameters D4-01 and D4-02 provide adjustments to enable the optimum performance during load
disturbances. The proportional gain (D4-01) adjusts the amount of instantaneous droop as a function
of loss, and provides dampening from load disturbances such as speed reference change, or a change
in load. The integral time (D4-02) adjusts the response time of the IMPULSE•VG+ Series 3 to the
load disturbances.
NOTE: Speed control response is increased by increasing the proportional gain setting and
decreasing the integral time. However, instability or hunting may occur between the
IMPULSE•VG+ Series 3 and the load if D4-01 (ASR Proportional Gain) is set too high, or
D4-02 (ASR Integral Time) is set too low.
Figure 5-25: Automatic Speed Regulator (ASR) Tuning
Parameter
Code
Display Function Range Initial Value
Access
Level
D2-01 Slip Comp Gain Slip compensation multiplier. 0.0–2.5 1.0 Adv
D2-05
0 Disable
1 Enable
Output V Lim Sel V/F Slip Compensation 0-1 0 Adv
Parameter
Code
Display Function Range Initial Value
Access
Level
D4-01 ASR P Gain 1 ASR Proportional Gain 1. 1.00–300.00 30.00 Adv
D4-02 ASR I Time 1 ASR Integral Time 1. 0.000–10.000 sec. 0.500 Adv
Speed
Reference +
-
Error
K (1+
1
s T )
(Output)
Torque
Reference
D4-05 D4-02
Speed
Feedback
Output (Torque Ref.)
Internal
Limiter
Input (Error)
Time
0