Yaskawa Matrix Converter User Manual download pdf (Page 97)

4-14

Notes on Tuning the MxC

If hunting, oscillation, or other problems originating in the control system occur during Test Run, adjust

the parameters listed in the following table according to the control method. This table lists only the most

commonly used parameters.

Table 4.3 Adjusted Parameters

Control

Method

Parameters Performance Default

Recom-

mended

Setting

Adjustment Method

V/f control

(A1-02 = 0)

Middle Output

Frequency Voltage A

(E1-08)

Minimum Output

Voltage (E1-10)

• Improving torque at

low speeds

• Controlling shock at

startup

Depends

on capac-

ity and

voltage

Default to

Default + 3

to 5 V

• Increase the setting if

torque is insufficient at

low speeds.

• Reduce the setting if shock

at startup is large.

Torque Compensation

Primary Delay Time

(C4-02)

• Increasing torque

and speed response

• Controlling hunting

and oscillation

200 ms

200 to 1000

• Reduce the setting if

torque or speed response is

slow.

• Increase the setting if hunt-

ing or oscillation occurs.

Torque Compensation

Gain (C4-01)

• Improving torque at

low speeds (10 Hz

or lower)

• Controlling hunting

and oscillation

1.00 0.50 to 1.50

• Increase the setting if

torque is insufficient at

low speeds.

• Reduce the setting if hunt-

ing or oscillation occurs

for light loads.

Hunting Prevention

Gain Setting (n1-02)

Controlling hunting

and oscillation in mid-

dle-range speeds (10 to

40 Hz)

1.00 0.10 to 2.00

• Reduce the setting if

torque is insufficient for

heavy loads.

• Increase the setting if hunt-

ing or oscillation occurs

for light loads.

Open loop

vector

control

(A1-02 = 2)

Middle Output Fre-

quency Voltage A

(E1-08)

Minimum Output

Voltage (E1-10)

• Improving torque at

low speeds

• Controlling shock at

startup

Depends

on capac-

ity and

voltage

Default to

Default + 1

or 2 V

• Increase the setting if

torque or speed response is

slow.

• Reduce the setting if shock

at startup is large.

Speed Feedback

Detection Control

(AFR) Gain

(n2-01)

• Increasing torque

and speed response

• Controlling hunting

and oscillation in

middle-range speeds

(10 to 40 Hz)

1.00 0.50 to 2.00

• Reduce the setting if

torque or speed response is

slow.

• Increase the setting if hunt-

ing or oscillation occurs.

Speed Feedback

Detection Control

(AFR) Time Constant

2 (n2-03)

Increasing torque and

speed response

750 ms

100 to 750

• Reduce the setting if speed

response is slow during

sudden load change.

• Increase the setting if hunt-

ing or oscillation occurs.

Torque Compensation

Primary Delay Time

(C4-02)

• Increasing torque

and speed response

• Controlling hunting

and oscillation

20 ms

20 to

100 ms

• Reduce the setting if

torque or speed response is

slow.

• Increase the setting if hunt-

ing or oscillation occurs.

Slip Compensation

Primary Delay Time

(C3-02)

• Increasing speed

response

• Improving speed sta-

bility

200 ms

100 to

500 ms

• Reduce the setting if speed

response is slow.

• Increase the setting if the

speed is not stable.

* 1. The setting is given for 200 V class MxCs. Double the voltage for 400 V class MxCs.

* 2. An example of how to tune the MxC is described on the next page.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 397 398

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Yaskawa Matrix Converter User Manual Page 97

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