Earthing Concept - Siemens SINUMERIK 810D Configuration Manual

11.02
12.95
2.1.4

Earthing concept

The 810D system consists of a number of individual components, each of
which, in its own right, complies with EMC and safety standards.
The CCU box and the SIMODRIVE components are screwed to a metal cabinet
wall. Make sure that a low-impedance contact of the CCU box with the cabinet
wall can be made near the screws. Insulating varnishes should be removed if
possible. Keep the connection free of corrosion.
The electronic earths of the modules are interconnected via the device and
drive bus and at the same time conducted to the X151 terminal of the MS
module.
References:
Machine
Operator
PCU
controlpanel
panel front
PA
PLC I/Os
Earth bar
Earth terminal
Large--area conductive connection
with earthed housing
Equipotential bonding conductor (± 30cm)
to earthed housing, A=10mm
Fig. 2-2 Earthing concept
E Siemens AG, 2002. All rights reserved
SINUMERIK 810D Manual Hardware Configuration (PHC) - - 11.02 Edition
/EMV/, EMC Installation Guideline
CCU
PA
MB
PA
PA
PA
MB: Shielded signal cable
with reference earth
M: Motor
G: Encoder
PA: Equipotential
bonding conductor
SL: Protective conductor
S: Mains connection S
2
2 Installation Conditions
2.1 Secondary electrical conditions
Power
Triggering
electronics
electronics
Distributor
SL in the motor cable
NCU terminal
G
block
M
Machine bed
Cross sections (mm
²10
SL min.
Mains connection S
S ±16
S
16 < S ± 35 16
S/ 2
S > 35
box
PA
PA
2
)
2-31