Hey Jim,
but this “solution”, to power the dust collection in both states, would mean that the dust collector is always on, regardless of how the relay is switched. That makes no sense.
Also what we talked about was something different: To trigger the control input of the IoT relay. The question was whether the outputs T1A, T1B and T1C on your VFD are real relays or just SSRs. Did you ask this? If the first is the case, you can connect these outputs directly to the IoT relay control input and let the VFD control the dust collector.
What you can do in any case, independently of whether these outputs on the VFD are real relays or SSRs, is to connect the spindle water coolant pump to it, because unlike the IoT relay, you can consider a coolant pump to always draw the minimum current anyway in order to ensure the SSR holds its state. This would mean you would use the internal relay/SSR of the VFD to switch the spindle coolant pump (and it’s designed to be made this way) and you need no external IoT relay for this.
Unfortunately, connecting also the dust collection directly to this output of the VFD is not possible as it is limited to 3 A (see diagram above) and a dust collector draws much more. For this you would need the external, IoT, relay.
Usually the dust collection is turned on when the CNC program encounters a M3 (start spindle) command. However connecting the IoT relay control input to the programmable control output of the VFD would be good since the ‘tool-enable’ pin 15 on Onefinity Controller I/O port that gets active when M3 is encountered, only works when the ‘tool-type’ on TOOL page is set to “Router” or to “PWM Spindle”, but it is not working when you have the ‘tool-type’ set to a VFD, because it is assumed that the VFD then controls such things.
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