IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 119
5.3.2 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.
Table 5-45: Motor Slip Compensation Parameter Settings
* Available only for 4810 and 41090 VG+ models.
5.3.3 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
®
•G+ and VG+ Series 4 automatically
adjusts the voltage during constant-speed operation as well as during acceleration.
The required torque is calculated by the VFD. This ensures trip-less operation and power savings.
Output voltage α 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 VFD and the motor is 100 feet (30.5 meters) 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:
• VFD faults due to motor overexcitation, and/or
• Motor overheat or excessive vibration.
Increase the torque compensation time constant in 10 ms increments when the motor’s output current is unstable.
Decrease this value when speed response is slow.
Parameter Display Function Range Default
D02-01 Slip Comp Gain Slip compensation multiplier. 0.0–2.5 V/f: 0.0
OLV: 1.0
FLV: 1.0
D02-02 Slip Comp Time Adjusts the slip compensation function delay time
(G+ only).
0–10000 ms V/f: 2000
OLV: 200
D02-03 Slip Comp Limit Sets an upper limit for the slip compensation
function as a percentage of motor rated slip
E02-02 (G+ only).
0–250% 200
D02-04 Slip Comp Regen Disabled slip compensation during regeneration
(G+ only).
0–2 0
0 Disabled
1 Enabled >6 Hz
2 Enabled >2 Hz
D02-05 Output V Lim Sel Automatically reduces motor flux when the output
voltage saturates.
0, 1 0
0 Disabled
1 Enabled
D02-13* Output V Lim Sta Output Voltage Limit Operation Start Level 70.0–90.0% 85.0
D02-14* Output V Lim Max Maximum Output Voltage Limit
Level
85.0–100.0% 90.0
D02-15* Output V Lim Lev Output Voltage Limit Level 30.0–100.0% 90.0
To Next Page
Loading...
Need help?
General
