YASKAWA Varispeed G7 Specifications download pdf (Page 428)

100

101

Varispeed G7 Control Modes

10-5

With torque control, operate within a speed control range of 1:10 on the regenerative side.

Precautions on Setting Parameters

If the parameters are not set properly, performance may be adversely affected.

• If there is a possibility of starting with the motor already rotating, enable the speed search function (b3-

01=1).

• When lowering a torque limit (L7- ), set it to as high a value as possible within the range allowed by

the system.

• If torque limit acceleration is performed, or if the motor slips at the torque limit causing a CF (control

fault), increase n4-08 (proportional gain of speed estimator) in steps of 5 until acceleration and decelera-

tion are performed smoothly. When n4-08 is increased, the torque reference (U1-09) may oscillate. If so,

increase C5-06 (ASR primary delay time) by about 0.050 s.

Precaution on Torque Accuracy

To ensure torque accuracy within the speed control range of 1:10 when the motor is operated by itself at

the minimum frequency and the torque reference (U1-09) is higher than in the medium- and high-speed

ranges, increase the setting of the torque adjustment gain (n4-17) and adjust the torque reference so that it

is about the same as that in the medium and high speed ranges.

100

200

-100

-200

60631

0.3

Load torque (%)

Speed (Hz)

Driving torque

Regenerative torque

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YASKAWA Varispeed G7 Specifications Page 428

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