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@Melspuds - We asked early on to be on the main UPS, they deemed it less expensive to have us provide small point of use units. I've used these many times before with great success, but never to hold safety relays. <oops> @VE1BLL - I've never had a UPS eat one of the kids... You should...

@IRstuff, APC's white papers usually relate to PC power supplies and switchover times. That's not what we have here. It is imperative that the relays ride through a brief power interruption. It's the difference between seamless operation of a laboratory HVAC system, and having to spend 45...

Re-wiring the equipment to use DC relays seemed daunting, but a lack of other low cost solutions made me re-evaluate. I found a simpler way to swap 4 of the 5 relays to DC, install a DC power supply feeding the two circuits that operate these relays. The 5th relay can cycle without causing...

Again, it's all AC circuits. Don't think capacitors will help. :( CV Transformers seem to be around the same cost as a double conversion UPS.

I wish it were that easy, but the circuits are all AC Voltage, not DC. :(

I have a UPS providing 120Vac to a transformer which converts it to 24VAC. This 24Vac circuit powers several Idec relays (50-80mA coil current each). I expected them to stay in position when power goes out since it's on UPS, but I failed to recognize that the UPS I am using has a .004 second...