YASKAWA VIPA 62H-MHC0 Manual page 71

VIPA HMI
Basic rules for EMC
HB160 | TP-ECO | 62H-MHC0 | en | 17-01
In the most times it is enough to take care of some elementary rules to guarantee the
EMC. Please regard the following basic rules when installing your PLC.
n Take care of a correct area-wide grounding of the inactive metal parts when installing
your components.
– Install a central connection between the ground and the protected earth conductor
system.
– Connect all inactive metal extensive and impedance-low.
– Please try not to use aluminium parts. Aluminium is easily oxidizing and is there-
fore less suitable for grounding.
n When cabling, take care of the correct line routing.
– Organize your cabling in line groups (high voltage, current supply, signal and data
lines).
– Always lay your high voltage lines and signal respectively data lines in separate
channels or bundles.
– Route the signal and data lines as near as possible beside ground areas (e.g.
suspension bars, metal rails, tin cabinet).
n Proof the correct fixing of the lead isolation.
– Data lines must be laid isolated.
– Analog lines must be laid isolated. When transmitting signals with small ampli-
tudes the one sided laying of the isolation may be favourable.
– Lay the line isolation extensively on an isolation/protected earth conductor rail
directly after the cabinet entry and fix the isolation with cable clamps.
– Make sure that the isolation/protected earth conductor rail is connected impe-
dance-low with the cabinet.
– Use metallic or metallised plug cases for isolated data lines.
In special use cases you should appoint special EMC actions.
n
– Consider to wire all inductivities with erase links.
– Please consider luminescent lamps can influence signal lines.
n Create a homogeneous reference potential and ground all electrical operating sup-
plies when possible.
– Please take care for the targeted employment of the grounding actions. The
grounding of the PLC serves for protection and functionality activity.
– Connect installation parts and cabinets with your PLC in star topology with the
isolation/protected earth conductor system. So you avoid ground loops.
– If there are potential differences between installation parts and cabinets, lay suffi-
ciently dimensioned potential compensation lines.
Basic rules for the EMC-equitable assembly of installations
Installation Guidelines
71