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chaterpilar
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Joined: 3-September 04
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Last Seen: 13th August 2010 - 05:08 AM
Local Time: Sep 3 2010, 10:42 PM
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21 May 2010
We have 4 ABB make ACS 550 series drives (30kw) in a dairy facility.
There are few computers on the same location which constantly have harddisk failures...we measured the common mode noise and found 5 volts.(output of UPS) The online (APC make) UPS does filter some of the noise but still some noise is seen at its output. I propose, 1.Replacing the existing unarmoured cable (VSD to motor) into armoured cable and the armour grounded at both sides. 2. Putting isolation transformer at the output of the UPS. 3. Putting line chokes for the VSD. Are there any other known culprits which cause common mode noise... ( I have used Fluke 435 and found THDVN going as high 233% range 50-233%) Are there any other things which can be done to protect the computers. Any ideas appreciated.
27 Mar 2008
Hi !!
I have attached a sketch for grounding setup for parralleling 3 LV generators with stepup transformers. Can anybody comment on pros and cons of this arrengement of earthing, and any suggestions/comments about choice of transformers are appreciated. Cheers.
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8 Mar 2008
Hi !!, We have a project to make a VFD based panel for a 2080 volts 60hz 250 hp submersible pump ( 300 metres deep). The vendor is proposing a 380 volts VFD of rated capacity and a inverter duty Autotransformer to stepup the output of drive to 2080 volts. I find it a bit odd, to put a stepup Auto-transformer in between the drive and the motor. I recommended a 2080 volts rated VSd and to put the transformer on the line side. The available supply is 380 volts 60 hz. Is it Ok to put a Auto-transformer at the output of drive? Any thoughts?
26 Feb 2008
I have seen panels with contactors on load side (output) of VSd, and some panels with contactors on both line(input side) and Load side of VSd. I personally do not use any contactors ( Load/line) for VSD. What are advantages/disadvantages of using contactors at the output and input of VSD? Any thoughts?
15 Jan 2008
AC Drives are sold with voltage ratings and HP ratings ,
now, my question is will a 40 hp 460 volts 60hz variable speed drive be suitable to be used in a place having 380volts 60 hz power supply to drive a 40 hp/380 volts motor. I feel drive has to be derated by 17%. Any thoughts.. |
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Lo-Fi Version | Time is now: 3rd September 2010 - 07:42 PM |
24 Aug 2010 - 10:02
