Operators Manual
ALS 221
Release 7/04 Page 29 Connections
4.3 EMI
To protect the machines against electrical noise and to protect production of electrical noise
you have to follow this rules:
Rule 1
All metallic parts must have a good and plane contact (no lacquer, aluminium oxide is an isola-
tor). Use scratch washers.
Rule 2
Signal lines (Data- , communication- and control cable) has to separated to power cables. The
minimum distance is 50 cm (20 cm inside a cabinet).
Rule 3
All signal lines should be lead in the machine or cabinet only on one side.
Rule 4
Unshielded cables must be twisted (both poles).
Rule 5
On all inductive components (relays, valves) must be directly connected a clamp circuit (diode,
MOV).
Rule 6
All signal lines must be shielded. The shield must have a good earth connection on both
sides.
For the connection use metallic clamps. Don’t use a soldered wire for this connection.
In case of different earth potential on both cable sides install parallel a cable of at minimum 10
mm
2
.
Rule 7
The shield of analogue cable (Video etc) should be shielded only on one side. Normally there is
no such cable with labelling machines.
Rule 8
Line filter has to be mounted directly on the cable entry.
Rule 9
Cables should not fly in the air. Lead all cables nearby metallic, grounded parts. Ground un-
used cables and wires in a cable at minimum on one side, better on both.
Rule 10
Cables should not be longer as necessary.
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