another questions regarding the contactor of my EV-build.
I used the Netgain Hyper9 system with the SME ACX1 inverter.
So there is the main contactor GV200QA. As soon the inverter is powered and has gone through self checks it activates the contactor.
But it makes a really "loud" humming noise as soon as activated.
I can control the pich of the noise when changing the frequency in the program, also the volume if I turn down the holding voltage. But if I turn it down to much the contactor loses connection when there are vibrations in the vehicle.
The other one (GV200MAB) I used controlled by the Orion 2 BMS doesn't make such noise.
Is it right, that the noise is normal due to the low frequency PWM given by the inverter?
Didn't hear such noise in other EV builds so wondering if this could be an issue.
Hope for your thoughts on this.