I just installed one and it was a piece of cake. Our TT manufacturer was even kind enough to have provided a space right beside the panel of just the right size for the EMS.
The display should continually cycle through amps, volts, hertz and error code (E0 if all okay).
There is the little "donut" (doughnut in Canada) current sensor that goes in the hot wire. It has an arrow on it and it needs to be pointed in the direction of the ground terminal. Not sure why it matters but that's what the instructions specifically says to do. Maybe you got the sensor turned around or the line and neutral wires reversed? The sensor MUST be in the hot wire. There isn't exactly a whole lot of space to massage the #10 wire and sensor into place.
The instructions aren't super clear on how to connect the wires and the T and L markings on the contactor are kind of small and hard to read. It would be nice if they had a diagram. Make sure you don't have the T1 and L1 connections mixed up.
The humming sound is okay. It has a contactor (relay) in it to shut the power off when called for. The humming is just 60 cycle hum of the coil. If it's loud enough to be objectionable when it's all covered up, then I'd call PI. Can't remember seeing screws holding down the contactor, but you could try tightening them if there are any.
As an aside, being an EE, I wasn't overly impressed with the internal ground screw to connect the ground conductors of the line and load 30 amp cables. I used a red twist-on marrette connector to connect the cable grounds directly together and ran a 3rd ground wire of same size as the in the cable over to the ground terminal with a crimp connector. The little grounding screw really is LITTLE and it wouldn't be good for the connection to loosen over time.
The burning question remaining for me is where to mount the remote readout. I could fish the wire up a wall and through a ceiling but the display is bright red and maybe it would be better inside an upper storage cabinet where I can get to it easily.
