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Can't take credit for this, a friend had seen it. But Rockwell, etc. were all lost.
Relay output card. Large rack. LOTS of outputs. Output would LIGHT but not close the contacts. Replaced the card. ALL GOOD, till a bit later. Now a different output won't work.
Ended up being the P2 power supply. If there are enough outputs on, the rack power supply is OLDER like me, then there's not enough power to pull all the OW relays in. But it WILL light the lights.
Relay output card. Large rack. LOTS of outputs. Output would LIGHT but not close the contacts. Replaced the card. ALL GOOD, till a bit later. Now a different output won't work.
Ended up being the P2 power supply. If there are enough outputs on, the rack power supply is OLDER like me, then there's not enough power to pull all the OW relays in. But it WILL light the lights.