Parker Hannifin S.p.A S.B.C. Division
SLVDN User’s Manual
Page 46 of 181
* The PE bar (for power grounding) must be mounted directly in contact; insulated columns
are not to be used.
** The signal cable shields can be connected to a bar (HF) different from the PE bar or
connected directly the metallic cable clamps to electrical cabinet back-plate.
*** In the “Cable connections” par. it is possible see every detail of this image
.
The electric cabinet bottom must be electrically conductive, for example zinc-coated. Strip off
any paint coat to ensure contact.
The grounding bar must be in contact with the cabinet bottom or ensure an excellent electric
connection and it must NOT insulated.
Route power cables away from signal cables.
5.17.
How to suppress interference
For the drive to meet the product requirements regarding electromagnetic compatibility
(EN61800-3), the installation must be carried out according to the following instructions.
Because of strong PWM voltage fronts, undesirable currents of significant force can
sometimes circulate through capacitive couplings and grounding systems (conducted
interference). Besides, also high frequency interferes in the form of radiation, especially
through the motor cable, in free space are generated (radiated interference).
The reduction/suppression of both conducted and radiated interference can be obtained
through:
9
grounding
9
shielding
9
filtering. In particular filters reduce the interference conducted in the cables and the
return of interference conducted at the source (the frequency converter) by using paths
with the lowest possible impedance. In this way other systems connected to the same
electrical line can be protected effectively and the frequency converter will also be
protected from the interference of other systems.
5.17.1.
Grounding
In the electric panels where the drives are usually installed there are two ground systems:
EMC ground, or HF reference (high frequency), represented by the wall made of non-
painted metal, onto which drives and filters are fixed.
The safety ground, or PE (protective earth), according to the EN60204-1 standard
Fix drive and mains filters, the 24Vdc power supply etc. on the metal wall, making sure that
there is a proper electric contact (HF connection), possible widest.
Carry the safety ground using cables having a minimum section of 10mm²