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5.3 Operating Using Speed Control with Analog Voltage Reference

5-23

Operation

5.3.2 Reference Offset Adjustment

In speed control, the servomotor may rotate at a very low speed with an analog voltage reference of 0 V. This

occurs because the reference voltage of the host or external circuit has a slight offset of a few millivolts. It is

called "offset".

If the servomotor rotates at a very low speed, the offset needs to be eliminated using the offset adjustment

function.

Use either automatic adjustment or manual adjustment. Automatic adjustment uses the automatic adjustment

parameter for reference offset (Fn009). Manual adjustment uses the manual adjustment parameter for refer-

ence offset (Fn00A).

(1) Automatic Adjustment of Reference Offset (Fn009)

The automatic adjustment of reference offset automatically measures the amount of offset and adjusts the ref-

erence voltage.

After completion of the automatic adjustment, the amount of offset is saved in the SERVOPACK.

Adjust the reference offset automatically using the following steps.

Offset

Motor

speed

Offset is automatically

adjusted in SERVOPACK.

Automatic

offset

adjustment

Speed

reference

voltage

Motor

speed

Speed

reference

voltage

Offset Adjustment Range:

15000 (Speed reference: ±879 mV)

Offset Setting Unit: 8

(Offset is reflected per 8.)

(Speed reference: 0.47 mV)

The reference offset must be automatically adjusted while the servo ON (/S_ON) signal

is OFF.

YASKAWA SGMGV User Manual

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