pooslinger
Electrical
- Nov 15, 2006
- 45
I have a AB powerflex 40 VFD that is running a belt. The Operator controls the speed of this belt with a dial that inputs a analog 0-10v into the analog input of the drive. The drive is terminated with the factory jumper at the "stop" input, and the start input is run thru an auxilary contact from the motor starter that is between the drive and the motor. No other digital inputs are used. This thing drops to 5htz randomaly with out a fault. And then comes back to the desired speed just as randomaly as it went out. My analog is good and I have 24v at the start input. Has anybody experenced this and can tell me what the heck is going on?