Improved Operating Efficiency
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Improved Operating Efficiency
This section explains functions for improving motor operating efficiency.
Compensating for Insufficient Torque at Start and Low-speed Operation (Torque
Compensation)
The torque compensation function detects that the motor load has increased and increases the output torque.
The Torque Compensation function calculates and adjusts the motor primary loss voltage according to the out-
put voltage (V) and compensates for insufficient torque at startup and during low-speed operation. Calculate
the compensation voltage as follows: Motor primary voltage loss x parameter C4-01.
Related Parameters
Adjusting Torque Compensation Gain
Normally, there is no need to make this adjustment.
Adjust the torque compensation gain under the following circumstances.
•
If the cable is very long, increase the set value.
•
If the (maximum applicable) motor capacity is smaller than the Inverter capacity, increase the set value.
•
If the motor is vibrating, reduce the set value.
Adjust this parameter so that the output current during low-speed rotation does not exceed the Inverter’s rated
output current range.
Adjusting the Torque Compensation Primary Delay Time parameter
Set the torque compensation function primary delay in ms.
Normally, there is no need to make this setting. Adjust the parameter as shown below.
•
If the motor is vibrating, increase the set value.
•
If the motor response is low, decrease the set value.
Param-
eter-
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
LCD Display
C4-01
Torque compensation
gain
Set the torque compensation gain using the multiplication
factor. Normally, there is no need to set this parameter.
Adjust the torque compensation gain in the following cir-
cumstances.
• If the cable is very long, increase the set value.
• If the (maximum applicable) motor capacity is smaller
than the Inverter capacity, increase the set value.
• If the motor is vibrating, reduce the set value.
Adjust this parameter so that the output current during
low-speed rotation does not exceed the Inverter rated out-
put current range.
0.00 to
2.50
1.00
Yes
A
Torq Comp Gain
C4-02
Torque compensation
primary delay time
Set the primary delay for the torque compensation function
in ms.
Normally, there is no need to make this setting. Adjust this
parameter in the following circumstances.
• If the motor is vibrating, increase the set value.
• If the motor response is low, decrease the set value.
0 to
10000
200 ms
No
A
Torq Comp Time
