I have a 2NO 2NC 120V coil, up to 400V contacts contactor. (Electrodepot 934022) I need to power both the coil at 120V and the contacts at 120V from the same source. Manufacturer says this is not possible without contactor malfunction because of feedback. I observe this to be true in real world tests with the device when a load is connected.
So what are the common ways to prevent feedback if one 120V AC single phase source is used to energize both the coil and an NO contact, which is held closed with 120V to pass through to loads?
Shading loops were suggested as a resolution to feedback, but they appear to be something an AC coil manufacturer already builds into AC contactors just to make them work in the first place by preventing the coil from de-energizing as the cycle crosses zero. Shading loops do not appear to address feedback.
The feedback I'm referring to is between the contacts and the coil when they are both powered from a single 120V AC source, where one NO contact is held closed with 120V passing through it. Any attached loads are presumably therefore connected to both the coil and the 120V source, and the coil can therefore de-energize into those loads.
Again, the manufacturer says you can not have both coil and contact powered this way without "doorbell" behavior, and device malfunction. Real world tests confirm this to be true. I'd like to prevent that if possible.
Update: I've added a drawing. Please understand my diagram skills are still limited, and I was trying to draw the device using the only available objects in EasyEDA's library. I also wanted the orientation to match the Contactor's diagram and my wiring. EasyEDA does not indicate when a wire jumps over another, so near R2 you'll see I tried to make the typical jump shape, but if there is no red node, then it means there is no connection. Please also note the Vehicle Chassis Ground to Neutral connection via R1 and R2 is mandatory code for RV power when not running on shore/main utility power. There is no debate over this. The only thing not pictured here is the much larger and more complex overall inverter, charge controller, AC switchgear, DC switchgear, and load devices. That's unnecessary to depict the basic wiring and the feedback I am attempting to resolve. All of those devices were not yet connected during this test, so they are irrelevant. Thank you for any useful feedback.
Here is also a drawing of the front of the Contactor. You'll note its 4 pole, but I couldn't find a 4 pole in EasyEDA, so I used the next best thing.