Quote Originally Posted by Nickhofen View Post
Can anyone suggest how to connect relays and fuses at this wiring diagram?
Hi Nick,

I have a primairy CB 16amp C type for the entire cabinet.

I have a CB 4Amp on the 230volt side of the 24vdc 2a supply. PSU secundary is shortcicuit protected.
But maybe an extra 24volt side glass fuse would be appropriate there.

The above CB's are for convienience only.


I still want a 16amp B type CB on secundary side 72vdc psu.
Mine is a high amp (10amps nominal) psu 500va transformer... and would like to protect the wiring in the panel.

Shorting out 72vdc circuit can lead to higher amps than i can trust some of the 1mm2 cabinet wiring with.


Since you have 5vdc onboard on ub1 no problems there.


For the relays.. is this about the e-stop relay we talked about?


Can you list the stuff you want to control by relays? You mentioned an ub1 has 3 onboard so...


Maybe pneumatic valves, pumps , vfd?

What needs switching on/off more than the 3 relays available to you?

I would use the onboard relays just for low current stuff like the remote on / off for the vfd , the spindle cooling pump, maybe chip clearing air valves and or liquids.

BTW doesn't your design allow for 4 combined end / home switches?

Do you plan on using all 8 off them?

like 4 home and 4 end?

I read about this a few times on the forum they can be combined in some configurations.

I have no hands on experience this subject (and a lot of other things) :-) yet.

Grtz Bert.



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