Earthing System/Electromagnetic Compatibility (Emc) - Siemens SINUMERIK 840D Description Of Functions

02.99
2.4.3

Earthing system/electromagnetic compatibility (EMC)

Ï Ï Ï
Ï Ï Ï
Ï Ï Ï
Operator panel
MMC
EPB/PE
– Ground (chassis) –
S7-300 peripherals
EPB
Earthing bar
Central earth connection
Fig. 2-19 Earthing system
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
The 840D system with HLA module consists of a number of individual
components. The individual components are listed below:
S
I/RF infeed/regenerative feedback module
S
NCU box
S
HLA module
S
MCP machine control panel
S
Qwerty keyboard
S
Operator panel components (various monitors with different MMC CPUs)
S
Terminal block (NCU and L2-DP)
S
Distribution box and hand-held unit
The individual modules are bolted to a metal cubicle panel. It must be ensured
that a low-impedance contact between the NCU box and the cubicle panel can
be made in the vicinity of the mounting screws. Insulating varnishes must be
avoided where possible.
The electronic ground connections of the modules are interconnected via the
device and drive buses and taken to terminal X131 on the I/RF module at the
same time.
The internal electronics ground of the HLA module is directly connected to the
metal front (module) plate.
Machine
control panel
EPB/PE
tGr
tGr: Shielded signal cable referred to ground
EPB: Equipotential bonding conductor
PE: Protective earth
Please note the following in relation to electromagnetic compatibility:
References: /EMV/, EMC Installation Guidelines
Standards according to Declaration of Conformity
(Appendix E)
Gating
electronics
NCU
tGr
EPB/PE
Hydraulic drive
EPB
Machine base
Mains connection S
S v 16
16 t S v 35
S u 35
2 Configuring
2.4 Wiring
Distribu-
HLA mod-
tion box
ule
EPB/PE
Terminal
block
EPB/PE
2
Cross-sections (mm )

10
PE minimum
S
16
S / 2
J
2-49