Hi Bob. You asked:
<< can a low voltage relay be used to control another relay which has a set of contacts that when activated, removes the energy supply circuit to the high volatage generator? >> A couple of things wrong with that. 1. Using a 'low voltage relay tpo control' is fundementally flawed, as they can fail open or closed, and you have no indication and no 'intrinsic failsafe' operation. 2. Using a relay to 'open on energise' is fundementally flawed as the coil or associated circuits may open circuit and leave the power on, or the opening cotacts may weld together. The two independent interlocks you require are simply two mechanical 'Safety Switches', which are positively linked to the doors such that the contacts are forced apart by a cam action so that at the unsafe position the contacts are 3mm apart and are non-overidable These switches can be directly connected into the supply to the HV supply , if it's a low voltage feed and fused within the switching capacity of the Safety switches. Or the switches may be wired into a suitable Safety Relay with dual redundant series cobntacts and failure checking systems such as the PNOZ range made by Pilz, or the Minotaur range made by Guardmaster, for exactly that purpose. Take care, Chris Dupres Surrey, UK. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
