Wiring And Shielding - Siemens SINAMICS S120 Equipment Manual

• Zone A is the line connection for the cabinet, including the contactor and the line reactor.
Interference in this zone should not exceed defined limits.
• Zone B contains the Power Module or Basic Line Module and the Motor Modules.
• Zone C contains potentially susceptible equipment (e.g. control and sensor systems).
• Zone D is the interface between the signal/control cables and the peripherals. A defined
noise immunity level is required here.
• Zone E contains the AC motor and the motor cable.
7.3.4

Wiring and shielding

To ensure compliance with EMC requirements, different types of cable must be routed
separately from other cables. To fulfill these requirements, the following cables must be
shielded:
• Supply lines between the line power outlet and the Power Module or Basic Line Module
• All motor cables (brake cables can also be part of the motor cable)
• Cables for digital and analog inputs and outputs
• Signal cables for the encoder, resolver, or tachometers
• Cables for temperature sensors and other sensors
Power and signal cables must not be routed directly next to each other and, therefore, must
be kept physically separate from each other (min. distance: of 20 cm). If this is not possible,
separators must be installed between the signal and power cables. The separators must be
grounded with the greatest possible surface area. If it cannot be avoided that signal and
power cables cross, make sure that they cross at right angles only.
To prevent external interference from infiltrating the cabinet, the shields for the cables used
must be grounded with the greatest possible surface area as close as possible to the cabinet
inlet. Suitable shield buses or comb bars can be used here. The busbars must be connected
conductively with the cabinet housing over the greatest possible surface area.
enclosure on both sides
maximum contact area!
Fig. 7-5
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
Connect to cabinet
ensuring good
conductivity and
Shield connection for motor cable at cabinet inlet
7.3 EMC-compliant drive installation
Shielding bus
Cable propping bar
Cabinet Design and EMC
7-9