Quote:
Originally Posted by Paul Haese
I would say no. It is 6mm cable 5 wire loom cable supplied by scope dome.
The cable is plastic coated only with outer casing and inner casings.
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Hi Paul,
The reason I asked about the model of inverter and whether the cable from the inverter
to the motor was shielded was because I had been thinking about your problem,
looked at the schematics from the ScopeDome web site, saw what models of
inverters they were using and then hunted down the User Manuals for them.
Here is a link to a web site in South Africa that happens to have a User Manual
for the SV-iE5.
http://www.google.com.au/url?sa=t&rc...49784469,d.dGI
You might like to confirm that this is the same model as yours.
If you could please turn to page 121 of 127 of the User Manual, I will attempt to
take you through it step by step.
On page 121 of the PDF, the manufacturer has their signed Declaration of Conformity
that they comply with EN 61800-3:2004 which is a standard addressing the
electromagnetic conformance (EMC) requirements of electrical power drive systems
and to EN 50178:1997, which is a standard addressing electronic equipment in
power installations.
Now it is important to appreciate that this Declaration of Conformity is for the
inverter only.
On the following page, 122, the manufacturer lists the applicable standards to
comply with the essential requirements of the European Electromagnetic Compatibility
Directive.
In other words, it's an engineer's way of saying "for this equipment to be used
in an installation where it is attached to a motor, these are the applicable
essential requirements".
If you could then please turn to page 123 of 127 in the PDF which has the title "EMI/RFI
POWER LINE FILTERS".
EMI stands for Electromagnetic Interference and RFI stands for Radio Frequency
Interference.
To quote the page -
Quote:
THE LS RANGE OF POWER LINE FILTERS FF ( Footprint ) - FE ( Standard ) SERIES, HAVE BEEN SPECIFICALLY DESIGNED WITH HIGH
FREQUENCY LG INVERTERS.
THE USE OF LS FILTERS, WITH THE INSTALLATION ADVICE OVERLEAF HELP TO ENSURE TROUBLE FREE USE ALONG SIDE SENSITIVE
DEVICES AND COMPLIANCE TO CONDUCTED EMISSION AND IMMUNITY STANDARDS TO EN 50081
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EN 50081 is the generic emissions standard. For equipment to be sold or
operated within the EU, they must by law meet this standard and a host of
others. Similar standards exist here in Australia.
What the text in this box is saying is "there are some power line filters that you
better use with this inverter to comply with the emissions standards and have less
trouble with other equipment nearby that might otherwise be affected by it".
They talk about the FF Series (Footprint) and FE Series (Standard) filters,
which are separate products they supply.
I refer you to the drawing at the bottom of page 123. They have separate
drawings for the FF Series and FE Series.
I further draw your attention to a few things on these drawings. Notice on both
drawings they have included a symbol for a common-mode choke on the cable
that runs between the inverter and the motor. This is precisely the device I was
recommending in my previous posts. Secondly, note the use of shielded cable
on that same cable. Thirdly, with the top drawing they have the FF Filter sitting
beneath the inverter (i.e. its footprint) but the dashed lines surrounding the
inverter, filter and choke I interpret to be an extra shielded enclosure.
Fourthly. notice that they show the inverter and filter to sit on an extended
metal plate which is to be connected to protective earth. Above the drawings they
have additional notes on the recommended installation instructions for the filters.
On page 124, they list the various model numbers of filters for the various models
of inverters and also have a mechanical drawing.
Finally, what chance you were supplied with one of these suitable filters and
common-mode chokes?
By the way, I noticed the inverter has a large number of parameters that can
be programmed and the front panel gives me the impression that one can
manually control the motor from it. Have you tried removing the cables
that interface the "USB box" to it and manually operated the motor from the
front panel to see if the problem still manifests itself? By pulling those cables,
you also reduce the loop area of one possible common-mode path.
In any case, my having pointed the bone earlier at the inverter-motor connection
dovetails with the manufacturer's own recommendations, but only time will
tell if my intuition was right. In any case, adding the filter, choke and shielded
cable sounds a lots easier than digging that trench.
I hope this advice proves helpful and solves the problem.
Best Regards
Gary Kopff
Mt Kuring-Gai NSW
02 9457 9049