I am trying to wire a bus door to open and close using 4 relays. Two for a momentary power source open/ close ( latching ) and two for switch reversing of the 12 v motor.

The bus also has 2 micro switches on at each end of the doors open / close locations. they are open when at the full extent ( open / close )

I have sat down with a pad to determine wiring and have no good ideas as to how to terminate the latching relay at the end of the run.

The switch on the dash gives a momentary power, I can get the latching system to supply the switch reversing relays, then stop by diconecting the latch relay's ground. Just not sure how to go the other way.

Using 5 prong 30 amp relay's

Any help appreciated.
Alan

 

The two switches on the door you mentioned are LIMIT switches.

They need to be included in the circuit in such a way, as to cut power to the motor should the door reach that position.

Are these DPDT relays, or SPDT?

I don't see a need for more than three relays to do the job. Can you post your wiring schematic, or what ever you have so far?

 

It seems to me that a bus door is an important part of safety.

What are you trying to accomplish that the door doesn't already do?

John

Edit: http://www.vapordoors.com/swing.html

 

The relays are 5 prong single throw.

The door on the bus does not operate due to the on board relay malfunctioning.

I understand the contact switches at the end of the limit ( door ) just not sure how to cut current to the motor, then reset the circuit for the return.

Al