V700, RS 485 Modbus, servo motor control absolut position

[Egyed Károly]

Hi, 

We have problem the absolut motor position after current interrupt. We see H-0B1C can give the absolut position of the servo-motor (Mi 25 absolut, see first drag file), but we do not know how we can go to this position.

We use H-6202 to give the position with H-6200 = 1 (see second drag file) but this is not absolut. After current interrupt the position will change. We tried the H-6200 =41 (relativ), but in this case the motor did not want to stop. The H-0B1C and the H-6202 are not in the same unit -> we use H-0B1C: 25÷70 (Mi 25 value range)  and for this H-6202: 1500÷5000 but this value range change after interrupt -> it will be 6500÷10000 or another. The different (3500) is same.

Please help us to understend this !

 

[kratmel]

Please post your hardware configuration. If servo drive is not Unitronics - please post model # or pdf for this drive.

Some servo system need to be reconfigured after power cut - for safety.

That is you try to solve problem on PLC side, but maybe some parameter must be changed on servo side or some commands (not setpoint)  must be send to servo before try to restore position.

P.S. As i see on pic - this is Linak linear servo with Modbus. Please post model# and communication manual for Linak Modbus

 

 

[Egyed Károly]

Yes, we also use Linak motor, but now we have problem with servo motors.

We have changed the 0.15 parameters  from 0 to 3.

Now we can use H-6200 in relativ mod (we put H-41 -> it means the 6 bit will be 1), but we can use only one direction. How we can use the oposit direction ?

We can see the absolut position in H-0B20 and H-0B21 and the unit also same (10.000 pulse/rev) , which we use to give the position in H-6201 and H-6202. So now we need to know to move the oposit direction.

We use:

EL6-RS750Z AC Servo Drive Leadshine

ELM1H-0750MA80F  AC SERVO MOTOR

Edited August 30 by Egyed Károly

[Egyed Károly]

we would like to use only one part of the circle, not the all circle. It would be an alternating movment. We have limitation in movment.