Denford Software & Machines

the triac i recently bought came with a siezed coolant pump.

swapped it out today with one from rotagrip.

it works but 50% of the time when switching it on or off the vr milling software returns a 1227 error and often disconnects from the machine.

the relay is operating fine. and its just the on/off switching that causes the issue.

i dont know uf this was a existing issue as the motor was knackered.

the new motor came with a 3uf cap. when i originally tried it just like that it crashed loads. i then stuck on the RC suppressor off the old motor which has reduced the crashing but it still happens.

only other thing to mention is the orignal motor had a terminal for an earth. the new one has just two red wires so i put the earth terminal onto a screw that holds the terminal housing to the motor body.

any experts care to comment?

im thinking i might need more supression, there is an earth issue or some other noise problem.

any pointers?

Is it an AC or DC motor? If it is any use I have a Roxburgh Suppressors SDC 021 2 Amp 250c AC unit you can have. It just goes in series with the live and neutral with a connection to earth.

It does sound like there is an issue with noise. More would be needed about the specs of the control and the motor (out of my areas sorry) but have a mooch at this https://www.pololu.com/docs/0J15/9

Pete

hi pete

it is an ac motor. perhaps i could try your suppressor circuit and see how it responds.

supressor currrntly fitted

The problem will be down to the inrush of current to the pump. Is it a higher current rating to the old one?

Is the suppressor fitted at the Coolant pump itself?

Pulling the wires to the pump out of the trunking and away from other wires might help.

Add another suppressor at the coolant relay end of the wires as well.


I would also pull out the RS 232 or USB cable from the trunking and route away from the other cables.

Hi steve.

I think the new pump is the same rating, its 1/8hp.

I will fit another suppressor circuit at the relay end then, the current one is fitted at the actual motor terminals.

The usb cable and pump power don't share any common trunking but i'll get eyes on where the power to the pump actually runs and see if some separation helps.

The noise could be being picked up on the 24V logic supply into the controller card.

Screening the supply to the pump may help.

Also ensure the mains cable to the machine is as short as possible and not running through an extension as this could also cause a volt drop as the pump starts.

Ok.

This got sorted then. I bought the modern equivalent of the suppressor circuit suggested by RS after entering the original p/n and replaced the one on the motor and also fitted a second to the COR relay.

Problem solved and it works perfectly now.

Thanks for the update.

So the solution was additional suppressor at the other end of the coolant pump supply.

Really sorry, ive got this one for you in the bottom of my bag, Car went pop so ive been trawling for a replacement. Didn't get chance to get to the postoffice.

Pete