Need Help Finding a Suitable VFD
Need Help Finding a Suitable VFD
(OP)
I need a VFD for 15 hp motor on 3/60/230 service. It needs a closed PID control loop option which is used primarily for HVAC applications I think.
We have a test fixture with a 15hp motor connected to a fan that we want to control. The fan will pressurize a chamber to a certain point and hold that pressure. We will change that setpoint often. There is a pressure transducer in the chamber telling us what the pressure is and outputting a 4-20 mA signal. This signal we want to feed right back to the VFD in the closed control loop.
I have found one from DanFoss, but it seems a bit expensive at $2800. Anyone have any suggestions on a certain manufacturer or good supplier?
Davey
We have a test fixture with a 15hp motor connected to a fan that we want to control. The fan will pressurize a chamber to a certain point and hold that pressure. We will change that setpoint often. There is a pressure transducer in the chamber telling us what the pressure is and outputting a 4-20 mA signal. This signal we want to feed right back to the VFD in the closed control loop.
I have found one from DanFoss, but it seems a bit expensive at $2800. Anyone have any suggestions on a certain manufacturer or good supplier?
Davey





RE: Need Help Finding a Suitable VFD
RE: Need Help Finding a Suitable VFD
here are some other sites:
http://www.saftronics.com/
http://web5.automationdirect.com/adc/Shopping/Catalog/D...
(Saftronics are same for the most part as GE but relabeled.) Automation Direct lists theirs at a little under $1900, but I don't know if it meets your specs... We have used a number of GE and SqD drives, but have not separated out the price for smaller individual drives -- Price will be higher for single, small quantity users...
good hunting...
RE: Need Help Finding a Suitable VFD
Good luck. Let me know if you need help when the time comes.
RE: Need Help Finding a Suitable VFD
I agree with Allphase, ABB makes a very good drive.
We have several ACS500's on the the floor that have been
running with out failure for 5-6 years.
In the greater Detroit area, I buy them from GALCO INDUSTRIAL ELECTRONICS. I had some questions on a newer ACS 601 drive that our company just purchased and the
in house drive engineer came out to look at our application and helped with fine tuning ,free of charge.
No, I dont work for them for this company, but they did
offer great customer service for a product they sold
after the sale, and that should be acknowledged in this day and age.
Regards,
Afterhrs
RE: Need Help Finding a Suitable VFD
It is not as complicated as it may sound, but many people don't consider this when designing the system.
One last thing. I don't know the type of fan you are using, but some require constant torgue VFDs while others can run on a variable torque. For the small dollar difference, get the constant torque.
Good luck.
RE: Need Help Finding a Suitable VFD
RE: Need Help Finding a Suitable VFD
CT's drives are relatively expensive, but we've found them very useful on awkward loads where other big name products have been less successful.
RE: Need Help Finding a Suitable VFD
We won't be running this thing all of the time either. The VFD will run a fan for approximately 30-40 minutes per day maximum. Each test will require the fan to run for no longer than several minutes at most.
Davey
RE: Need Help Finding a Suitable VFD
At one time, they private labled for Saftronics, EMS, etc., and they have aquired Magnetek.
RE: Need Help Finding a Suitable VFD
RE: Need Help Finding a Suitable VFD
http://motion-controls.globalspec.com/SpecSearch/Search...
for the search form. This will especially be convenient if more VFD requirements are known than have been posted so far.
RE: Need Help Finding a Suitable VFD
RE: Need Help Finding a Suitable VFD
(OEM for SV-9000)and see who is who on the VFD market.
My choice is Yaskawa, reliable, well known and service friendly. Support is good too.
Their G3 series drive was the best drive ever made.
Current products F7, P7 - (HVAC specific) are very good and economical drives. AB is overpriced.
RE: Need Help Finding a Suitable VFD
HAVE FUN
BOB
http://www.sew-eurodrive.de/englisch/05_dokumentation/index_doku.php
RE: Need Help Finding a Suitable VFD
http://www.sew-eurodrive.ca/3_products/3_electronic-control-drives/04_movitrac-07-frequency-inverter.asp
so am adding it here following up on the previous posting
Often, more compliances with industry standards are seen