SL20 SPINDLE SPEED

[bahnfire18]

I've have an issue with the command speed being more than the actual speed. I checked the actual speed with a tachometer and it matches. I installed a new encoder on both the spindle and the motor and followed all of the parameter changes that are required. It seems that for every 1000rpm commanded the actual speed if 15rpm lower. 1000CMD-985ACT, 2000CMD-970ACT, etc. Any help would be greatly appreciated.

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[servtech]

I've have an issue with the command speed being more than the actual speed. I checked the actual speed with a tachometer and it matches. I installed a new encoder on both the spindle and the motor and followed all of the parameter changes that are required. It seems that for every 1000rpm commanded the actual speed if 15rpm lower. 1000CMD-985ACT, 2000CMD-970ACT, etc. Any help would be greatly appreciated.

I don't know the age of your machine, but it may be possible you have either a drift potentiometer or parameter to balance the spindle speed. Most allow a 10% error and your error is only 1.5%

Program M3 S0
Then M4 S0

If the spindle creeps around one way or the other, it's a drift problem.

I used to adjust drift until M3/4 S0 resulted in a near static spindle.