选填,简要介绍文档的主要内容,方便文档被更多人浏览和下载。

3.3 Absolute encoder positioning routine

Prior to the first start the absolute encoder has to be positioned. Using following semi

automatic procedure it is possible to measure the offset of the encoder. At the same time

it is possible to check that current measurement chain is operating correctly. It is also

possible to measure the transient inductances of the motor. Operation is done via AMC-

table group 191 DIAGNOSTICS.

This software version supports also marine encoder installation where the position

encoder rotates with electrical frequency. To enable this function, select Parameter

111.08 GRAY MECH CONNECT to GRAY EL SPD instead of GRAY ME SPD before

charging of the drive.

1. Set parameter 191.02 OFFSET CALC CMD = ON.

2. Set 191.9 DC CUR REF to 20%.

3. Be prepared to monitor phase and excitation currents.

4. Start the drive and stop it when rotor has stopped rotating.

5. Check that excitation current is flowing.

6. Check that phase currents are flowing as it is shown in the figure below.

ba = x

c

Figure 1. Phase Currents during DC magnetization routine.

=> ia = i cos (30deg) * 2

ib = 0 ic = - i cos (30deg) * 2

7. Check that GRB1 CAL OFFSET (166.18) is zero, if not then set it to zero.

In case of redundant GRAY set GRB2 CAL OFFSET (146.46) to zero.