Grounding Concept/Electromagnetic Compatibility (Emc) - Siemens Sinumerik 840D Series Function Manual

2 Configuration
2.4 Connection
2.4.3

Grounding concept/Electromagnetic compatibility (EMC)

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Operator panel
MMC
PA/SL
- Ground (frame) -
S7-300 I/Os
PA
Grounding bar
Ground terminal
Fig. 2-17 Grounding concept
2-48
The 840D system with HLA module consists of a number of individual
components. The individual system components are:
S
I/RF infeed/regenerative feedback module
S
NCU box
S
HLA module
S
Machine control panel MCP
S
Qwerty keyboard
S
Operator panel components (various monitors with different MMC CPUs)
S
Terminal block (NCU and L2 DP)
S
Distributor box and handheld unit
The individual modules are attached to a metal cabinet panel by means of
screws. Make sure that near the screws a low-impedance contact of the NCU
box with the cabinet wall can be made. Insulating varnishes must be avoided
where possible.
The electronic grounding points of the modules are interconnected via the de-
vice and drive bus and at the same time conducted to the X131 terminal of the
I/RF module.
The internal electronics ground of the HLA module is directly connected to the
metal front (module) plate.
Machine
control panel
PA/SL
MB
MB: Shielded signal cable with reference ground
PA: Equipotential bonding conductor
SL: Protective conductor
Please note the following in relation to electromagnetic compatibility:
References: /EMC/, EMC Installation Guidelines
Standards according to Declaration of Conformity (Appendix E)
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Gating
electronics
NCU
MB
PA/SL
Hydraulic drive
PA
Machine bed
Line supply connection S PE minimum
S v 16
16 t S v 35
S u 35
 Siemens AG, 2003. All rights reserved
02.99
10.03
Distribu-
HLA module
tion box
PA/SL
Terminal
block
PA/SL
2
Cross-sections (mm )

10
S
16
S/2
J