Okuma MC4VA OSP5000 "557 ALARM B Spindle pulse generator"

[defcom]

Hi,

I have okuma MC4VA with OSP5000M, from yesterder I have a problem with her:

1. Spindle can't start, and there is no alarm on OSP5000 monitor and no alarm in spindle drive unit

2. After about 15 seconds alarm occurs on OSP5000 monitor "557 ALARM B Spindle pulse generator"

I have read in alarm list that possibly there is a problem with:
1) Defective pulse generator
2) Defective ECP card 3

How can I diagnoze which part is defective, where I can find "pulse generator" ?? And maybe someone know hot to fix this ?

Thank you.

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[kurmay]

Probably defective pulse generator.
You can related information on check data pages when you manually rotating spindle.

[defcom]

When I rotate it by hand, speed is displayed correctly on monitor. But there is no way to start spindle...

[Algirdas]

check if speed monitoring gear is not dirty.

[cncts11]

This can get involved, but for starters, do you see the spindle try to move at all when you command it to go (possibly jerk a little and then fault out)?