ive had the exact opposite experience,,if always had them fail on closing,,(i say always,,its only been a few times),,ive attributed it to what i know about transistors and their biasing,,so im curious to see what others have experienced,,
i do know that video jets ( cant remember which series) use battery power(9v regular square battery),,to power up their SSR inorder to get the machine going,,i saw someone changing out the main board on one machine when i told him to change the battery first,,he thought i was nuts,,but explained the logic,,and sure enough,,he was up and going,,and it became part of our pm to change batteries in all our video jets every 6 months,,
Fred Raud
PS,,i still havent figured out why videojet made their machines this way,,,so if someone could fill me in,,that would be great,,