mitsubishi encoder pole detection method

[mahnasr]

Hello

we have afew mitsubishi servo motor in our plant.we had to replace bearing one of them(servo motor)

but it seem something wrong.the servo motor dont move at all and some allarm appear in servo drive mrj3.

the alarm ara 21,52,51

the question is about pole magnetic detection mentioned in MR COFIGURATOR2 software.

is there anybody here who any experienced to align encoder on mitsubishi servo motor with mr configurator.

BEST REGARDS.

[Gambit]

Which Drive are you using  ?

[mahnasr]

HI

thank you to quick respond.

the dive model is MRJ3B.

TNX

[Gambit]

Hmm you're getting overloads. Have you tested the motor free from the machine ?

[mahnasr]

yes.we have test it in free run.the problem was persist.we ara absolutely sure pole magnetic detection is require.but we dont know procedure.

if you know share it pls.

its urgent

TNX

[FRANK RUIZ]

On 14/09/2018 at 10:39 AM, mahnasr said:

yes.we have test it in free run.the problem was persist.we ara absolutely sure pole magnetic detection is require.but we dont know procedure.

if you know share it pls.

its urgent

TNX

Hi could you please confirm part no. of the servo amp, and which motor is it controlling? i.e. HFKP13, with MRJ310A.

I will look into it, and ask around team, see if anyone knows anything.

[GreenMan]

Hi

Usually this operation is done in an external machine. I do not know if this is possible without this machine?

[yurtaev]

an older topic but...

mitsubishi amps do not perform any pole detection with regular rotary servo motors. for the commutation to be correct, absolute encoder disc has to be aligned correctly relative to the magnetic rotor. otherwise you'll be getting overcurrent alarms. to align the encoder:

- connect to the amp with MR Configurator so you can read encoder position counter
- block the rotor with DC current from a lab power supply - U-positive, V-negative
- loosen encoder disc hub setscrews and rotate the disc so that electrical angle is 150deg and fix the screws

e.g. for a 6-pole (3 pairs) motor with 18-bit encoder that is:
262144/3 * 150/360 = 87381 * 150/360 = 36409
so encoder should read somewhere around 36409, 123790 or 211172

Edited February 14, 2019 by yurtaev