MVD motor relay switchboard

(with Jan Boissevain, Paul Gianotti)

The motors are switched by mechanical relays which need 24V. This board sits between the 'relay board' and these mechanical relays. It is housed in the MVD ancillary VME crate, but does not use anything from the backplane. A ribbon with a 10-pin 0.1" connector comes from the relay board. The 0-5V signals on this input ribbon switch miniature relays on this board that send 24V to the motor relays, via a terminal block located on the rail just below the VME crates. The 24V is supplied locally by a supply located near the terminal block.

	schematic ps version
	layout ps version

November 2000: The single line to switch the LV gets fanned out to 4 control lines going to the various supplies in the LV crIf they are twisted together, they can no longer be independently controlled. Therefore we decided to add 3 more relays such that 4 independent LV lines are available, still switched by a single input. We also decided to implement the board using ExpressPCB to increase reliability.

This is the PCB file: motor.pcb
	ps
	ps
	ps

Pin assignments:

function	input connector pin even pins are GND	output connector pin
chiller 1	1	1,2
chiller 2	3	3,4
fan	5	5,6
pump	7	7,8
LV	9	9,10
		11,12
		13,14
		15,16

Last update 10 Dec 2000 -HvH
back