Recent content by boaterbill

Yes you probably can, but the pump motor's VFD will need to be configured for the single phase input. The drive will need to be rated for twice the FLA of the motor. This is because only half of the input rectifiers are available to energize the DC bus. So a 120 amp 40 horse VFD will need to...

If the windings of the motor are starting to fail the carrier frequency whine can increase. Also if there is stray currents through the bearings it can make the motor sound louder. I would change the carrier freq and see if the problem noise follows suit.

The mechanical inertia needs to be determined. A soft start will reduce the strain on the mechaincal equipment as the unit is ramping up. A VFD will operate the motor across different speeds to operate in the process more efficiently. Contact Robicon or Allen-Bradly for the medium voltage info...

I would check the buss fuses. I had an ABB ACH 500 do a similar thing about a year ago. Ramp up to about 40-45hz and trip.

As each of the manaual dampers open/close, the static setpoint will change. installing a static pressure sensor 2/3 of length of the duct from the fan as in put to the controls will allow the VFD to ramp up/down to maintain the static pressure needed. BTW, the real installation will be lucky...

If you have the potential for dirty water, then why are you considering a chilled water system? If that is such a problem, DX will work. And the chilled water lines are sealed anyway, you always treat the water on installation, so again, why is the cost /quality of water a problem in less than...

can you put a divider on your reel? that might seperate the power from ethernet enough to not have problems.

If the motors are new, the winding insulation should be OK. How long are the motor leads from the VFD? Anything over 100 feet I would put on an output reactor to reduce the harmonic spikes at the motor.

I am not familiar with that drive, but since you are already using Breaking resistors, see if you can also use DC injection braking from the inverter. There should be a paramter setting for this. Good luck

When the soft-start has ramped the motor to full speed, switching to the bypass contactor will still require the contactor to be able to handle the FLA of the motor. Some bypass contactors are rated to start and stop the motor without the soft-start and are rated for full starting current...