SECTION THREE – ELECTROMAGNETIC COMPATIBILITY (EMC)
DS2000 USER’S MANUAL (rev.C)
3.10
3.5 RECOVERY RESISTOR
To meet the EMC Directive the enclosures containing the recovery resistors must be
conductive. The recovery resistor cable must be shielded and the shield must be 360°
clamped at both sides.
NOTE: before mounting the enclosure of recovery resistor to the panel make sure that any
paint or other covering material be removed.
3.6 SCREENING
To effectively screening the system all the single screens (CNC, electronic cabinet, machine,
motor housing, cables) must be connected together to effectively form one screen.
3.7 SAFETY ASPECTS
Noise suppression of motor and drive systems involves consideration of the grounding
system, and its effective-ness at high frequencies. It should not be forgotten the safety aspect
and that the safety must take priority over EMC.
To reduce the radiated emissions, the use of capacitance to ground is very effective. In fact,
Schaffner filters have Y-type capacitors near the input power supply connector.
These capacitors leak current from phase to ground; this can be in the order of hundreds of
milliamperes.
WARNING: appropriate safety measures should be taken to ensure that this potentially
dangerous current flows to ground.
CAUTION: it is recommended to disconnect the drive and the EMC filters to carry out the AC
Voltage Tests of EN 60204-1:1997, par.19.4, in order to not damage the Y-type capacitors
between phases and ground. Moreover the DC voltage dielectric test required by
EN 50178:1997, product family standard, has been carried out in factory as a routine test.
The DC Insulation Resistance Tests of EN 60204-1:1997, par.19.3, may be carried out
without disconnecting the drive and the EMC filters.
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