Siemens SINAMICS G120 Operating Instructions Manual page 49

● For screw connections onto painted or anodized surfaces, establish a good conductive
contact using one of the following methods:
– Use special (serrated) contact washers that cut through the painted or anodized
– Remove the insulating coating at the contact locations.
● Equip the following components with interference suppression elements:
– Coils of contactors
– Relays
– Solenoid valves
– Motor holding brakes
Interference suppression elements include RC elements or varistors for AC-operated
coils and freewheeling diodes for DC-operated coils.
Connect the interference suppression element directly at the coil.
Cable routing and shielding
● Route all inverter power cables (line supply cables, connecting cables between the
braking module and the associated braking resistance as well as the motor cables)
separately away from signal and data cables. Maintain a minimum clearance of 25 cm. If
cables can be separately routed, use metal partitions that have a good electrical
connection to the mounting plate.
● Route the cables from the line supply to the line filter separately away from the following
cables:
– Cables between the line filter and inverter
– Connecting cables between the braking module and associated braking resistor
– Motor cables
● Signal and data cables as well as filtered line supply cables may only cross non-filtered
power cables at right angles.
● Keep all cables as short as possible.
● Always route signal lines, data cables, and the associated potential equalizing cables in
parallel with the shortest possible clearance between them
● Use shielded motor cables.
● Route the shielded motor cable separately from the cables to the motor temperature
sensors (PTC/KTY).
● Use shielded signal and data cables.
● Connect the shields to the grounded enclosure at both ends with a good electrical
connection through the largest possible surface area
● Connect the cable shields as closely as possible to the point where the cable enters the
control cabinet.
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
surface.
4.2 Connecting inverters in compliance with EMC
Installing
49