Brian,
thank you for your input.
I have (quickly) checked the machinery directive. It does not contain anything
on
EMC, maybe just a hint to EMC and safety if you read between the lines.
The standards listed in the OJ only cover EMC for agriculture machines, lifts
and
sewing machines.
So I need to use the EMC directive to cover electromagnetic phenomena.
Maybe I am missing something. What is your point?
regards,
Jan Vercammen
<[email protected]>
Sent by: [email protected]
19/10/2006 12:16
To: <[email protected]>
cc: (bcc: Jan Vercammen/AMEMV/AGFA)
Subject: RE: classification of a (very) large industrial printer
hi
have you investigated application of the Machinery Directive 98/37/EC to this
'product' ?
definition of what constitutes a machine is given in Article 1 as:
"(a) 'machinery' means:
— an assembly of linked parts or components, at least one of
which moves, with the appropriate actuators, control and power
circuits, etc., joined together for a specific application, in particular
for the processing, treatment, moving or packaging of a
material,
....... "
This route may allow you to apply other EMC standards more suitable to the
application of your 'product'.
Brian McAuliffe
My own opionions only.
_____
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: 16 October 2006 10:08
To: [email protected]
Subject: classification of a (very) large industrial printer
hello EMC group,
last week we performed EMI measurements on an industrial
printer. The printer is a very large device, about the size
of a volleyball field.
It has two mains inputs (400V, 3 phases + neutral) rated
at 125Amps and 200Amps, respectively.
There are a large number of industrial cabinets with high-speed
digital electronics, PLC circuits, inverters, fuzes, sensors,
pneumatic circuits, ... and motors to (1) pickup paper, (2) transport/feed
it into the imaging section, (3) deposit ink using a one-axis movement
robot with over 50 printing heads, (4) partial curing using UV-light
(5) pickup and move it to the final drier section using - once again, UV -
and (6) move it to an output/stacking unit.
If we consult CISPR11:2003 we have to classify this equipment into a class
and group. The class is the easy part: class A.
Wrt the group definition it seems that we are group 1, that is, we do not
generate (intentionally) electromagnetic radiation for the treatment of
materials. Actually, we use electromagnetic energy to generate heat, UV light
and motion (and power digital circuits).
In standby the printer is on or slightly above the class A, group 1 conductive
limit(for both QP and average emissions).
In printing mode the conducted emssions rise by about 20dB in the frequency
range of 150kHz to 2MHz.
We do not understand this behavior, but this is currently not the concern.
One last piece of information: the conducted emissions were measured
using a voltage probe as described in CISPR11.
Here are my questions:
-1- is there a voltage probe limit for class A group 1 devices? It is not
in the standard, that is for sure! So can I add 30dB to both QP and average
limits? (To derive a class A group 1a limit, as a manner of speaking?)
-2- Why not classify the device as a group 2a device? It seems this is
also a possibility as there are no other limits in CISPR11 for equipment
rated over 100Amps. If you look at annex A of CISPR11:2003 then I have the
impression that the scope of group 2 is wider and could include equipment that
does not require intentional generated electromagnetic radiation for its
operation (e.g. thyristor-controlled equipment --> transistor inverters which
we
use)
It seems not unfair to use similar limits (that is, use group 2a) for equally
current-rated (over 100 Amps) group 1 equipment measured with the CISPR11
voltage
probe.
Any suggestions, an opinion??
Thank you,
Jan Vercammen
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