C.7 Emc Wiring Technique - Baldor VS1SD Installation & Operating Manual

C.7 EMC Wiring Technique

Attention:
Line drawing shows only principle of an EMC wiring. The shown installation can be different to
any national standard (e.g. VDE)
MN766
Y-Capacitor
CONTROLLER
Figure C-2
1 CABINET
The drawing shows an electroplated zinc coated enclosure, which is
connected to ground. This enclosure has the following advantages:
- All parts mounted on the back plane are connected to ground.
- All shield (screen) connections are connected to ground.
Within the cabinet there should be a spatial separation between power
wiring (motor and AC power cables) and control wiring.
2 SCREEN CONNECTIONS
All connections between components must use shielded cables. The cable
shields must be connected to the enclosure. Use conductive clamps to
ensure good ground connection. With this technique, a good ground shield
can be achieved.
3 EMC - FILTER
The EMI or main filter should be mounted next to the power supply (here
BPS). For the connection to and from the main filter, screened cables should
be used. The cable screens should be connected to screen clamps on both
sides. (Exception: Analog Command Signal).
Note: EMC compliance testing was conducted on representative drives
of each frame size using Schaffner FN3258 and FN351 series filters.
4 GROUNDING (EARTH)
For safety reasons (VDE0160), all Baldor components must be connected
to ground with a separate wire. The diameter of the wire must be at minimum
AWG#6 (10mm 2 ). Ground connections (dashed lines) must be made from the
central ground to the regen resistor enclosure and from the central ground to
the Shared Power Supply.
Minimum size of the protective earthing conductor shall comply with the local
safety regulation for high protective earthing conductor current equipment.
5 Y-CAPACITOR
The connection of the regeneration resistor can cause RFI (radio frequency
interference) to be very high. To minimize RFI, a Y-capacitor is used. The
capacitor should only be connected between the dynamic brake resistor
housing and terminal pin R1.
CE Guidelines C-3