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Indramat Servo Motor Encoder Replacement
Field Replacement of Encoder

Any one ever replaced an encoder on an Indramat Servo Motor? Is there an alignment issue with the motor shaft?

If you are talking about motor for digital drives (MDD, MHD, MKD) - it is very important to have encoder properly lined up.
If I remeber correc for MDD motor you can set it:
- connect motor to the drive,
- connect PC to the drive with hyperterminal
- hit some hidden keystroke (Alt-I or similar- don't remember) - it will bring special encoder menu.

I am not sure about other drives.
Ask Indramat.


Yes, there are alignment issues, depending on what motor series you are referring to. Some of their encoders are incremental, and (using an Indramat
software tool) store the commutation angle along with other information into non-volatile encoder memory when the motor and encoder are initially set up.
So far as I know, it is necessary to use their commissioning software when replacing an encoder.

I don't know, what type of Indramat motor you have. Supposed, you have integrated "Incremental encoder + Position sensor + Contactless Tacho". In this case you should align position sensor with the motor shaft. that means position sensor should deliver "On" signal on the output of phase "A", when motor armature phase "A" is in "working" position.

Mike Virgiliev

The old series Mac Motors are easy to re-align but the new digital range Indramat have been very sucessful not to let third parties tamper as you need their software. Have had years of close ties with Indramat and numerous days in their repair shop as that is what I do. Siemens are much more user friendly.

By Barry Beaver on 21 February, 2004 - 12:41 am

I agree with the post where Indramt has their angle position hidden within the memory of the unit... unfortunately I have not seen a common angle position when reading the memory. So before you remove the encoder you have to read the memory...


By BYTERUNNER on 6 March, 2018 - 7:59 am


>I agree with the post where Indramt has their angle
>position hidden within the memory of the unit...
>unfortunately I have not seen a common angle position when
>reading the memory. So before you remove the encoder you
>have to read the memory...

I know that this post is rather old, but I kindly ask if someone have some electrical schematics/info about the Indramat tachogen unit which is integrated into the motor.

I think that the tachogenerator I'm referring to very old MAC motors, have to be aligned with the hall sensor (which is optical in these type of motors, made by small lamp), because there are no brush. Then the tacho have to be electronic commutated by means of the hall switch sequence in order to select the proper voltage generated by the tacho itself accordling the correct rotation of the motor.

Also another think is if someone know what should be the minimum voltage for the tacho that the servo drive is able to manage. in others words is know the lower limit for the tacho signal that is corresponding to the minimum RPM achievable?

As compared to a full digital implementation (like a F/V conversion starting from pulse of a magnetic ring or encoder) able to generate at the end a -10 V to +10 V analog signal proportional to the speed what can be a estimation of the minimum resolution for the digital generated analog signal? Should have a minimum of 10 bit, 16 bit or more? of course analog have theoretically infinite resolution, but due to offset and noise I think that there are some limit on the resolution of the analog signal representative for the speed, someone know what can be this level for a practical point of view?

Using some digital implementation show ringing of the motor specially when the torque corrent settings is set to the maximum value, may be the updating time should be faster that some ms or resolution of the analog signal higher than 12 bit?

This is just experiments with a very old motor but I'm very interested to gain some knowledge on this matter.

Thanks in advance!!

Best Regards