Good morning Eric,
the fault detector for the 24V DC circuit is a simple device.
There is a two way switch which normally flips into neutral/center. The center is connected to the Amel bonding system.
The left position is marked + it is connected to the - of the DC circuit, and in this line is a little control lamp.
If you switch to + and the lamp lights, you know that you have a contact (that is: fault) between DC+ and the bonding system.
The right position is marked - it is connected to the + of the DC circuit, with a little control lamp in the line.
If you switch to - and the lamp lights, you know that you have a contact (again: fault) between DC- and the bonding system.
