Motor Slip Compensation; Torque Compensation - Magnetek Impulse G+ series 4 Instruction Manual

Motor 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. D02-01 sets
the slip compensation gain. When the gain is "1.0", the output frequency is increased by 1% of the
E01-06 setting at rated current. A setting of "0.0" results in no slip compensation.
Parameter Display
D02-01 Slip Comp Gain
D02-02 Slip Comp Time
D02-03 Slip Comp Limit
D02-04 Slip Comp Regen
0 Disabled
1 Enabled >6 Hz
2 Enabled >2 Hz
D02-05 Output V Lim Sel
0 Disabled
1 Enabled
D02-13* Output V Lim Sta
D02-14* Output V Lim Max
D02-15* Output V Lim Lev
* Available only for 4810 and 41090 models.

Torque Compensation

The motor torque requirement changes according to load conditions. Full-range automatic torque
boost adjusts the voltage of the V/f pattern according to the required torque. The IMPULSE
VG+ Series 4 automatically adjusts the voltage during constant-speed operation as well as during
acceleration.
The required torque is calculated by the inverter. This ensures trip-less operation and power
savings.
Output voltage  Torque compensation gain x Required torque
When more torque is needed, increase the torque compensation gain in one-tenth (0.1) increments.
Increase the setting when the wiring distance between the inverter and the motor is 100ft. or longer.
If the motor generates excessive vibration or oscillates, decrease the torque compensation.
Increasing torque compensation gain increases motor torque, but an excessive increase may cause
the following:
• Inverter fault trips due to motor overexcitation, and/or
• Motor overheat or excessive vibration.
IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
5-56
Table 5-45: Motor Slip Compensation Parameter Settings
Function
Slip compensation multiplier.
Adjusts the slip compensation
function delay time,
Sets an upper limit for the slip
compensation function as a
percentage of motor rated slip
(E02-02).
Disabled slip compensation during
regeneration.
Automatically reduces motor flux
when the output voltage saturates.
Output Voltage Limit Operation
Start Level
Maximum Output Voltage Limit
Level
Output Voltage Limit Level
Range Default Model
0.0–2.5 V/f: 0.0 G+/VG+
OLV: 1.0
FLV: 1.0
0–10000 ms V/f: 2000 G+
OLV: 200
0–250% 200 G+
0–2 0 G+
0, 1 0 G+/VG+
70.0–90.0% 85.0 VG+
85.0–100.0% 90.0 VG+
30.0–100.0% 90.0 VG+
®
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