rons
Diamond
- Joined
- Mar 5, 2009
- Location
- California, USA
You have all seen the grey control box with hinged door. Open door and a stud exists on the door.
The bottom of the box has a white colored plate which attach to the bottom of the box with a screw in each corner.
The screw in each corner mates with a welded stud in the bottom of the box.
A 120v line into the box will connect to a circuit board mounted with aluminiun stand-offs on the white plate.
A second circuit board will be mounted on the door. This board will be on aluminium stand-offs in each corner,
the standoffs mounted to a aluminium plate, with the plate held by the door ground stud.
The first circuit board is a power supply to the cpu board on the door. So there are four wires going from the first
board to the board on the door (24v, 5V, 3.3v, power supply ground, not frame ground).
So the questions:
1. Can the incoming power (2 wire 120v) with ground (green wire) be connected at the circuit board 1 (power supply)?
2. Or does the green wire always go to a stud? And is the same stud used to connect a wire braid to the door?
3. Is it normal to connect the circuit board ground to frame ground via one of the weld box studs?
This is done by a circuit board trace routing directly to a board mounting hole.Or should a separate
wire go from the circuit board to a single stud for all ground connections?
The bottom of the box has a white colored plate which attach to the bottom of the box with a screw in each corner.
The screw in each corner mates with a welded stud in the bottom of the box.
A 120v line into the box will connect to a circuit board mounted with aluminiun stand-offs on the white plate.
A second circuit board will be mounted on the door. This board will be on aluminium stand-offs in each corner,
the standoffs mounted to a aluminium plate, with the plate held by the door ground stud.
The first circuit board is a power supply to the cpu board on the door. So there are four wires going from the first
board to the board on the door (24v, 5V, 3.3v, power supply ground, not frame ground).
So the questions:
1. Can the incoming power (2 wire 120v) with ground (green wire) be connected at the circuit board 1 (power supply)?
2. Or does the green wire always go to a stud? And is the same stud used to connect a wire braid to the door?
3. Is it normal to connect the circuit board ground to frame ground via one of the weld box studs?
This is done by a circuit board trace routing directly to a board mounting hole.Or should a separate
wire go from the circuit board to a single stud for all ground connections?