HF500 spindle pump on/off -> twitching motors

Good news!

I've now found a solution to avoid the motors twitching when turning the spindle pump on/off.

1. A high quality line filter between the pump and the supply.
2. Two snap on ferrites on the parallel port cable close to the SC PCB.

I have to say that it is a disappointment that SC release a product that have not been properly tested for immunity to pickup disturbances. Especially when the disturbance is coming from their own choice of spindle pump.

I hope that SC will find a better pump and that users of the forum benefit from the effort I've made.

Cheers,

Per Takman

Hi Per,

Glad you have finally overcome your interference problem. Trouble is that system interference suppression is still somewhat of a black art, and what works for one configuration may well fail for another.

For every unfortunate user ( such as yourself ), there are probably dozens who have never had a hint of a glitch - and this includes me! At least your problem succumbed to a logical approach and will be a good guide for others with similar problems.

Cheers,

Peter