Geo Brick Drive User Manual
Motor Setup
189
Finding the Phase Offset
The phase offset is found experimentally by performing a one-time phase force test on an
uncoupled/unloaded (preferably) motor:
1.
Read/update the absolute position (must be read correctly for the phasing to work).
Issue a #n$* command, or enable the corresponding absolute position read PLC.
2.
Record Ixx29, and Ixx79 (if non zero).These should be restored at the end of the test
3.
Set Ixx29=0, and write a positive value to Ixx79 (500 is a good starting value).
4.
Issue a #nO0 to send a zero open loop output.
5.
Increase Ixx79 until the motor is tightly locked onto a phase.
6.
Make sure the motor is settled and stationary (locked onto a phase)
7.
Record the following value (this is the motor’s phase offset):
Technique 1
Technique 2/3
For Ixx01=3
For Ixx01=1
Query the motor’s corresponding
serial data register A
e.g. RY:$78B20
Query the motor’s corresponding
position ECT result
e.g.: RX:$3502
Query the motor’s corresponding
commutation ECT result
e.g.: RX:$3512
8.
Issue a #nK to kill the motor
9.
Restore Ixx29, and Ixx79 to their original values
Setting up Ixx81, the power-on phase position address:
Technique 1
Technique 2/3
(Ixx01=1)
For Ixx01= 3
For Ixx01= 1
= Serial data register A
= Ixx83 (Pos. ECT result)
= Comm. ECT result
Technique 1:
If Ixx01= 3;
Ixx81 is equal to the motor’s corresponding serial data register A. (e.g.: I181=$78B20).
If Ixx01=1;
Ixx81 is equal to the motor’s corresponding position ECT result. (e.g.: I181=$3502).
Technique 2/3:
Ixx81 is equal to the motor’s corresponding commutation ECT result. (e.g.: I181=$3512).
Summary of Contents for Geo Brick
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