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  • Users: bafco
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  1. bafco

    Multiple VFD trips on Over Voltage; Stumped!

    I'd usually agree david, with the exception of if the caps are switched based on demand. This facility is towards the end of a long feeder (don't know how far away the sub is, it ducks behind a bunch of trees, but it's at least a mile long). But, they are by far the largest consumer on the...
  2. bafco

    Multiple VFD trips on Over Voltage; Stumped!

    Thanks guys; I've got a conference call Monday with the utility company. They had put a logger on the mains incoming for about a week prior to my visit; the resolution on their plots is terrible though (2 minutes). I'm going to have to put the ball in their court, as the drive's are operating...
  3. bafco

    Multiple VFD trips on Over Voltage; Stumped!

    Hello all, I've been visiting a facility over the last two days trying to troubleshoot a problem with thirteen 460V 2HP VFDs; package class Deltas. These are very compact, but they do have quite the feature set. When I was first notified of the problem, I was informed that on multiple...
  4. bafco

    100-250VAC & 24VDC in one multi-conductor cable

    Thanks for the info guys, ~Mark
  5. bafco

    100-250VAC & 24VDC in one multi-conductor cable

    Hello all, Keeping AC and DC separated has always been a rule I've followed. I've got a space-limited application now though that would easily be cured by having a multi-conductor cable between two cabinets, using three conductors for my AC and the remaining two or three for my DC. The...
  6. bafco

    load reactor temperature

    Thanks Dick. Unfortunately, our multi-motor applications also rely on the reactor to reduce not only voltage overshoots at the motor, but to reduce cable charging currents as well. When we run the 460V units without the reactors, our overload relays begin to trip out due to charging currents...
  7. bafco

    load reactor temperature

    Thanks guys. I'll give both of these a shot. It's better to try these than to purchase a Sine wave filter. The price makes me shiver a bit.
  8. bafco

    load reactor temperature

    I have a customer with a Powerflex 40 VFD, 10 HP, driving 5 1.5HP motors. We employed a single MTE load reactor between the VFD and the motors. As long as the system runs on a 4kHz carrier, we don't have a problem. Unfortunately, this customer has found the audible motor noise undesireable...
  9. bafco

    AB Powerflex 4 drives?

    Sounds like you have parameter A096 (Flying Start) enabled. This feature comes in handy if your system suffers a temporary power loss or the like, and has a large inertial load with a long coast time. The drive will start a 60 Hz regardless of the command reference, and seek the loads actual...

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