[Sixtysix66]

Good day.

Please could someone help me with this problem ? ---->

I have a Matsuura MC 500 V2 VMC with a Yasnac MX1 controller.
When I turn the servo power on the spindle moves upwards by about one inch and then I get an ERROR 343 SERVO ERROR (Z). It does this every time I turn on servo power. I have to bring the spindle down again by turning off the power and rotating the ballscrew manually.

Thanks in advance

Sixtysix

[underthetire]

Sounds like a bad tach on the z motor.

[Sixtysix66]

Hello underthetire,

thanks for your response. Maybe I can find something in the diagnostics for tacho generator.

Sounds like a bad tach on the z motor.

[Sixtysix66]

the diagnostics shows some signal from the Tacho generator. You can see a "1" briefly (on diagnostic number 1290 4th position from left) before the servo power is shut off. Could I have upset the alignment between the servo motor and the tacho generator?

[Sixtysix66]

I had a visit from a service engineer yesterday.
He swapped the inputs to the drives from Z to Y and Y to Z after which the Y axis started to run away. So the problem seems to be from the Controller and not the drives.
Does the above ring any bells?

Will greatly appreciate any suggestions.