Good day. I have a plan to set up my pond pump so that it starts when the VFD is energized, and stops when the VFD is shut down. To do this, I want to use a solid state relay with a 3-32V DC trigger from the VFD. I have painstakingly reviewed the manual for the VFD, and can only find that there is an output for 24 volts. I can not find any info to determine if this is always on and energized, or if there is a parameter setting that needs to be done. I could dismantle the VFD case and use a multimeter to check, but perhaps someone has the inside info on this aspect of the VFD. Thank you.
I have reviewed the same manual as well, and have not been able to identify the status of it. I can say for us it’s a jumpered connection.
I have my 220v spindle on a light switch (appropriately rated), and my iot strip right next to it, and its a habit of flipping one switch on, flip the other on. flip one off, flip the other off. My pump is plugged into always on.
Thanks for the prompt response. I just used a multimeter and can confirm that between the COM terminal and the +24 terminal there is indeed 24V DC when the VFD is powered. Once power is disconnected, the 24V drains down slowly and returns to zero volts. This would be perfect for my intended application. The slow drain down would keep the pump running for a short time after the spindle has stopped. I considered using the IOT outlet, but only measured mV levels, and that would not be enough to trigger the intended SSR.
Cool Bill. Glad you got the information your looking for, as long as your not looking to power the pump with the vfd, and only use it for triggering your relay.
The missing piece of your test is what happens when you turn the spindle on? I don’t know exactly where you’re getting the 24v, but there is a couple of places where it’ll drop the voltage when the spindle is on.
Sounds like you know this, but the slow draining voltage is the capacitor(s) that are built in and the same reason it appears to be on for a few seconds after turning it off.
I think it will work just fine for the trigger on the SSR. I have no intention of using the 24V output for anything else. And I now realize that the IOT output is only activated when the spindle reaches a predetermined speed. Is there any way to adjust that setting on the VFD so I can have the IOT output set for a different speed or parameter?
There is not that i can see and have been told, and it’s not a predetermined speed. It is an -ish speed (5500 rpm). All we can configure is assign the output to send voltage upon spinup.