Open Loop Vector Control Method - YASKAWA GA800 Technical Reference

Ac drive for industrial applications

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Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.

In Closed Loop V/f Control, ASR only controls the output frequency. You cannot make a high-gain as in Closed Loop Vector control.

Precaution When You Use IE3 Premium Efficiency Motors

IE3 motors have different motor characteristics from IE1 and other motors. Set the parameters as specified by the

motor characteristics. If the drive detects oC [Overcurrent] or ov [Overvoltage] during speed search after the drive

restores power after a momentary power loss, set these parameters:

• b3-03 [Speed Search Deceleration Time] = default value × 2

• L2-03 [Minimum Baseblock Time] = default value × 2

• L2-04 [Powerloss V/f Recovery Ramp Time] = default value × 2

Open Loop Vector Control Method

In Open Loop Vector Control, keep C4-01 [Torque Compensation Gain] at its default setting (1.00).

If you cannot get speed precision during regeneration in Open Loop Vector Control, set C3-04 = 1 [Slip

Compensation @ Regen Select = Enabled above 6 Hz].

YASKAWA SIEPC71061737D GA800 Drive Technical Reference

4.10 Fine Tuning during Test Runs (Adjust the Control Function)