Improved Operating Efficiency; Torque Compensation For Sufficient Torque At Start And Low-Speed Operation - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Improved Operating Efficiency

This section explains functions for improving motor operating efficiency.
Torque Compensation for Sufficient Torque at Start
and Low-speed Operation
The torque compensation function detects a rising motor load, and increases the output torque.
The inverter calculates the motor primary loss voltage and adjusts the output voltage (V) to compensate insuf-
ficient torque at startup and during low-speed operation. The compensation voltage is calculated as follows:
Motor primary voltage loss × constant C4-01.
Related Constants
Con-
stant
Number
C4-01 Torque compensation gain
Torque compensation delay time
C4-02
constant
Adjusting Torque Compensation Gain (C4-01)
Normally, there is no need to change this setting.
Adjust the torque compensation gain under the following circumstances.
If the cable is very long, increase the set value.
•
If the motor capacity is smaller than the Inverter capacity (max. applicable motor capacity), increase the
•
set value.
If the motor is vibrating, reduce the set value.
•
Adjust this constant so that the output current during low-speed rotation does not exceed the Inverter rated
output current range.
Adjusting the Torque Compensation Primary Delay Time Constant (C4-02)
Set the torque compensation function primary delay in ms.
Normally, there is no need to change this setting. Adjust the constant under the following circumstances:
If the motor is vibrating, increase the set value.
•
If the motor response is low, decrease the set value.
•
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Name
Sets the torque compensation gain using the multiplication
factor.
Set the delay for the torque compensation function in ms.
Setting
Description
Range
0.00 to
10000
Change
Factory during Access
Setting Opera- Level
tion
1.00 Yes A
2.50
0 to
200 ms No A