Mark Snodgrass
Member
I have an application using AB 1771-OAD output cards to drive pneumatic solenoids for diverters on a sorter system. Production wanted a way for the operator to fire the solenoids locally to clear a jam. Running new wiring for inputs was impracticable, so we wired a switch at each valve to energize it (120 Volts). Started blowing fuses (each output fused externally) and eventually blew up two of the outputs on different cards.
What causes that? I checked that the output card voltage source and the switches voltage source were the same. I am perplexed.
I did come up with an alternative solution of using a spdt toggle switch with the solenoid as the common, the card NC, and the 120v line NO.
Thank you for your time.
What causes that? I checked that the output card voltage source and the switches voltage source were the same. I am perplexed.
I did come up with an alternative solution of using a spdt toggle switch with the solenoid as the common, the card NC, and the 120v line NO.
Thank you for your time.