Help Wiring NC Pressure Switch to VFD for Start/Stop Control

Hi,
I recently purchased the GK3000 VFD (5HP, 220V single-phase input to 3-phase output).
Link: https://ato.laisteel.com/5hp-vfd
I’ve wired a two-wire pressure switch to X1 and COM. I need help with the following:
What should I set P0.03 to for this setup?
Can I connect more than one wire to the COM terminal? I’d also like to wire in a low oil level switch (a dry contact, continuity-type).
Thanks for all the Advice!

Basil wrote:Hi, Basil!
Thank you for your purchase. To answer your question:
1. If you are using terminal control, set P0.03=1; you can add more than one wire to be connected at the COM terminal. No problem, COM is the public port.
2. Is the output signal of your compressor pressure switch a dry contact normally open/normally closed contact? Do you want the low oil level to trigger the signal and stop the VFD operation? Please tell us what is the specific control process of VFD. How is it started/stopped?
Regarding VFD terminal control, you can refer to this video, see on: https://www.yout111e.com/watch?v=KERNV5omUNs

ATO wrote:Thanks,
1. The output signal of my compressor pressure switch is a dry contact, normally open. 
2. Yes, I want the low oil level to trigger the signal and stop the VFD operation. 
I also need the VFD to restart automatically when the pressure switch opens, when the pressure drops to a certain level.

Basil wrote:Basil, you can implement these functions. Setting parameters as below:
P0.01=0 (set frequency by panel potentiometer)
P0.03=1 (external terminal control)
P3.00=1 (X1 terminal function is defined as FWD forward function), self-reset button, normally open, X1 terminal, and COM are directly short-circuited with a wire.
contact.
P3.01=10 (X2 terminal function is defined as stop function) normally open contact. 
The normally open contact of the pressure switch is connected to the X2 and COM terminals.
P3.14=0 (2-wire control mode 1)

For other parameters of VFD, you can refer to the previous video.

ATO wrote:Sorry, I was wrong. I assumed the pressure switch was normally open, but it's normally closed. Please advise, thank you very much.

Basil wrote:You're welcome!
If the pressure switch is an NC contact, and you want to use the NC switch to stop the VFD, you can refer to the button control video below.
One button switch X1 serves as the start signal, and the other switch X3 serves as the stop signal connected to the normally closed contact switch (pressure switch), see: https://www.yout111e.com/watch?v=KERNV5omUNs

ATO wrote:I don't have any switches except for a pressure switch, included a pic for reference. This is as basic as it can get.

Basil, if you do not have any switches other than a pressure switch, you can connect the X1 and COM terminals directly to the normally closed contacts of your pressure switch.

You can implement these functions.
Setting parameters as below:
P0.01=0 (set frequency by panel potentiometer)
P0.03=1 (external terminal control)
P3.00=1 (X1 terminal function is defined as FWD forward function) X1 terminal and COM are directly short-circuited with a wire to the pressure switch.
P3.14=0 (2-wire control mode 1)

Directly control VFD start/stop through a pressure switch.
But there is a problem. When the pressure of your pressure switch reaches 165 PSI, the signal is triggered, the normally closed contact is disconnected, and the VFD stops.
If the pressure switch pressure drops only a little, the pressure switch will reset, causing the VFD and motor to start frequently. 
That's why we recommend one switch for starting and another for stopping.

ATO wrote:Thanks for your response. I've now connected the NC pressure switch between X1 and COM, and set the parameters as advised.