Resolver Input Em-Res; Offset - BONFIGLIOLI Vectron Manual

Active cube expansion module em-res-03 230 v/400 v

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Table Of Contents

Table of Contents

6.4

The resolver input is used for evaluating the position information from the resolver.

The frequency of the field signal for the resolver is set to the fixed value of 8 kHz.

If the no. of resolver pole pairs > 1, the measured electric angle runs through the

range of 0°...360° several times during one mechanical revolution.

For the detection of the position angle of the rotor at a synchronous motor, the ratio

of the no. of motor pole pairs to the no. of resolver pole pairs must be an integer.

The no. of pole pairs of the resolver can be adjusted via parameter

Pairs

No.

381

6.4.1

In order to enable the start of a synchronous machine, the absolute position of the

rotor must be known. This information is required in order to actuate the stator wind-

ings in the right order depending on the position of the rotor. The position of the ro-

tary field in the synchronous machine must be controlled in order to obtain a continu-

ous movement of the rotor. During first commissioning, the position of the rotor wind-

ing of the resolver is adjusted to the rotor displacement angle of the synchronous mo-

tor by adjusting the offset. For operating a synchronous machine with resolver, the

offset must be adjusted in order to obtain perfectly true running and a maximum

torque.

The correct

value 0 (approximately) while the motor is turning.

No.

382

The offset can be determined and adjusted as follows:

•