Hi all went to a job to day to re-instate the emergency power off contactors to two dsiboards in a school. They operate machinery so when an e stop is hit they need to open. I have done the mains power side and connected the coil up temporarily to energise it . The problem i am having is the E stop circuit is an old part of the system and so i need to interface this with my contactors. The E stop buttons are non latching n/c and there is a keyswitch in series with these as an isolator to stop the power being used if nobody is there. these are all wired in a loop from an enclosure. Also we have a start and stop button which have both n/c and n/o contacts and are non latching aswell. These are wired as a common linked between the two switches and then a n/c and a n/o back to the enclosure so 3 cores in total . then i have the 230v live from the control circuit ,with a neutral and also the live to operate the contactors coil to pull the 100a contactors in. I believe i need to use a latching relay to make this all work correctly but could someone pont me in the direction of a diagram , and perhaps the RS part number for the correct relay .
Chhers in advance
Nick
Chhers in advance
Nick