Mounting; How To Suppress Interference; Grounding - Parker TWIN-N Series User Manual

Parker Hannifin S.p.A. Divisione S.B.C. user's manual TWIN-N and SPD-N

2 MOUNTING

• The converter must be mounted vertically with the power block
• A space of at least 100 mm. must be left free above and beneath the converter.

2.1 How to suppress interference

For the drive to meet the product requirements regarding electromagnetic compatibility, 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
grounding, shielding and 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.
Basically, the criteria are essentially based on grounding, filtering and shielding.

2.1.1 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).
Carry the safety ground using cables having a minimum section of 10mm²
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