zacherypost
Lifetime Supporting Member
Hello everyone,
Background: We have a Directlogic 405 PLC that has an output card that has all solenoids on it. These solenoids are on plugs with LED indicators showing their state. It is a Triac based output card D4-16TA
The problem: All the solenoids on this output card have their LED illuminated showing an on state when they should be de-energized. A voltage test shows 16VAC from output to neutral. When the output gets energized, the solenoid does not change states. DMM shows 130VAC to neutral in this state.
Failed solutions: We have swapped the output card and changed the PLC backplane. I've added resistors up to 30kohms in series and parallel. Relanded every neutral on the terminal block strip. What else should we be looking for?
Any help will be greatly appreciated.
Background: We have a Directlogic 405 PLC that has an output card that has all solenoids on it. These solenoids are on plugs with LED indicators showing their state. It is a Triac based output card D4-16TA
The problem: All the solenoids on this output card have their LED illuminated showing an on state when they should be de-energized. A voltage test shows 16VAC from output to neutral. When the output gets energized, the solenoid does not change states. DMM shows 130VAC to neutral in this state.
Failed solutions: We have swapped the output card and changed the PLC backplane. I've added resistors up to 30kohms in series and parallel. Relanded every neutral on the terminal block strip. What else should we be looking for?
Any help will be greatly appreciated.