Limits, homes, override switch

[JAZZCNC]

You can always use a 3PDT switch like this one below.[U] BUT you don't need any reset for Homes if you keep them on separate input pins.

No Don't use any relay for Home switches just connect direct to the Input pin or pins. The Relay cause a delay and makes homing unrelaible.

You can share one Input for all Home switches provided you use the correct switch type and connection.

If your wanting to share the Switch for both Home and Limits then you can't using the Relay approach for the above reason.

[cropwell]

Hi,

First - What switches are you using for homes and limits ?

The 3 wire Inductive type of switch usually floats (no connection) or grounds the switch contact depending on whether NC (normally closed) or NO (normally open), The fact that you use 24v or 10v to power the inductive sensor doesn't matter.

NC are normally wired in series with the first switch being connected to actual GND and the next switch getting its GND from the preceding switch NC contact, with the last switch in the series having the NC contact going to the BoB. This means that if any one switch is triggered then the input to the BoB goes to 'float' and circuitry inside the BoB lifts it to logic 1 (active high).

NO are wired in parallel, so that if any one switch is triggered, the input to the BoB is forced to GND (logic 0, active low).

As Jazz says relays are unnecessary and cause errors in Homing precision.

NC switches are preferred as they fail to 'safe' if you have a circuit break.

Cheers,

Rob

[valdis034]

No Don't use any relay for Home switches just connect direct to the Input pin or pins. The Relay cause a delay and makes homing unrelaible.

You can share one Input for all Home switches provided you use the correct switch type and connection.

If your wanting to share the Switch for both Home and Limits then you can't using the Relay approach for the above reason.

How about using solid state relay? It doesnt have moving parts so no delay or it is very very tiny?

Išsiųsta naudojantis SM-G900F Tapatalk 4 Lt

[JAZZCNC]

How about using solid state relay? It doesnt have moving parts so no delay or it is very very tiny?

Išsiųsta naudojantis SM-G900F Tapatalk 4 Lt

Better but still not recommended or required. STR's also tend to fail in the on state which isn't good either.