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  1. #11
    In the DIY context it sounds like personal preference dictates and other than the VFD cooling fan sucking in crap if it's not enclosed I don't suppose it matters, in an industrial setting it would always be inside the enclosure with suitable filtered vents for cooling. If the wiring and layout is done properly there should not be any problem with interference.
    I don't know about the Chinese VFD's but I'm used to using those with a control panel that can be mounted on the front of the enclosure set to view whichever parameters you want.

    I'll give an example about the cooling fan.
    At one place I worked the environment was quite dusty but not that you could see it floating about in the air. Some inverters were installed in 2m tall cabinets with vents for air intake, the vents were not filtered because the air did not seem that bad. After a month or two one of the drives failed, eventually it had to be sent back to the manufacturers for examination. It was found that the two internal cooling fans blast air over the control boards than onto the power devices, this is how it should be, but where the boards had double sided track, the connecting ferrules had been 'sand blasted' away by the dusty air being blow over them. The answer was to fit replaceable filters to the cabinets and spray a better conformal coating (they called it tropicalising, just lacquer at the end of the day) over the boards.
    Last edited by EddyCurrent; 02-02-2014 at 03:16 PM.

  2. #12
    Quote Originally Posted by EddyCurrent View Post
    In the DIY context it sounds like personal preference dictates and other than the VFD cooling fan sucking in crap if it's not enclosed I don't suppose it matters, in an industrial setting it would always be inside the enclosure with suitable filtered vents for cooling. If the wiring and layout is done properly there should not be any problem with interference.
    Fully understand what you mean Eddy but end of the day we are in a DIY setting and building to industrial level is prohibitly expensive to do correctly and often massive overkill in a DIY enviroment. The problem I've found with interference comes not so much from Incorrectly wired or layout but more from crappy sensitive electronics like Chepa Bob's etc which you often find in DIY enviroments. This is why I won't use Cheap Bob's Drives etc anymore they are just a Pain in the arse.!!

    Regards the out of cabinet VFD and Front panel then Yes with Chinese VFD's you can wire the front Panel and fit to front of enclosure but that then means having Enclosure located where it can be seen and often you'll want that out the way under machine or some other inconvenient location.
    Where has placing VFD close by the machine is relatively easy and doesn't require messing around with extending wires or buying expensive Add-on cards Etc.

    Really like you say it's down to individual preferance at this level. End of the Day we just need to be safe and not worrying about making some HSE boff happy and limiting the potential for Baldness inducing problems.
    Last edited by JAZZCNC; 02-02-2014 at 03:53 PM.

  3. #13
    Quote Originally Posted by JAZZCNC View Post
    Really like you say it's down to individual preferance at this level.
    But don't be thinking I'm going soft !
    Last edited by EddyCurrent; 02-02-2014 at 06:39 PM.

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