califflash
Member
I've got an issue on a new system that I installed about two weeks ago. I've had to replace 3 of the 10 interposing relays that I have on the outputs of my Micro830. I am utilizing Allen Bradley 700-HLT1U24 terminal block relays. The relays operate DynaQuip 110v motorized valves. The relays stop switching and lock in either the NO or NC position.
I believe the issue stems from neglecting to attach the -24vdc common to the negative common of the PLC. I had not used a wiring scheme like that before and didn't realize it was absolutely necessary.
Also, the valves only draw 1.8a locked rotor and the relays are rated at 3a 110vac. Switching rate is not terribly frequent, >5 minutes, but on state is typically 5-10 minutes. I have ensured that the limit switches on the valves are set correctly so that a locked rotor condition does not occur.
Did I damage my relays by being a buffoon and merely need to replace them? Or is something else wrong?
I believe the issue stems from neglecting to attach the -24vdc common to the negative common of the PLC. I had not used a wiring scheme like that before and didn't realize it was absolutely necessary.
Also, the valves only draw 1.8a locked rotor and the relays are rated at 3a 110vac. Switching rate is not terribly frequent, >5 minutes, but on state is typically 5-10 minutes. I have ensured that the limit switches on the valves are set correctly so that a locked rotor condition does not occur.
Did I damage my relays by being a buffoon and merely need to replace them? Or is something else wrong?