Protective Grounding And Potential Bonding - Siemens SIMODRIVE POSMO A User Manual

2 Installing and Connecting–Up
2.3 Connection and wiring overview
2.3.2

Protective grounding and potential bonding

Protective
grounding
Grounding
preparations
Grounding cable
shields
PROFIBUS
cabling
Grounding
load power supply
Grounding
electronics power
supply (optional)
Power supply
2-50
Use the M5 threaded hole in the connection cover for the protective
conductor (refer to Chapter 2.3.1).
Notice
When removing a POSMO A it is not permissible that the protective
conductor is interrupted.
We recommend the following when connecting–up the protective
conductor:
S
Star–type configuration, or
S
the input and output of the protective conductor on the connection
cover must be crimped in a cable lug (refer to Fig. 2-13).
Connect cable shields, ground connections and electronic grounds to
ground through the largest surface area.
The cable shields must be connected in the gland to the largest surface area.
Notice
The cable shield of each bus node must be connected to ground
through the largest possible surface area (at SIMODRIVE POSMO A
in the PG gland).
Recommendation:
Route a potential bonding conductor in parallel to PROFIBUS
(cable cross–section: 4 – 16 mm
Use the M5 threaded hole in the connection cover for the potential
bonding conductor (refer to Chapter 2.3.1).
If connector couplings are used for PROFIBUS at higher data transfer
rates (> 1.5 Mbaud), then perfect functioning can no longer be
guaranteed (cable reflection).
Ground the load power supply at the secondary side in the cabinet.
When using a shielded cable, the shield must be connected at the sup-
ply point to ground potential through the largest possible surface area.
Ground the 24 V electronics power supply on the secondary side in the
cabinet. The power supply cables are routed without any shielding in
the PROFIBUS cable.
PELV
Protective Extra Low Voltage
The protective extra low voltage (PELV) must have protective separa-
tion, be grounded and must be safe to touch.
Applicable standards:
DIN EN 60204 Part 1, DIN EN 60529, DIN EN 50178 DIN VDE 0160
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
2
).
E Siemens AG 2013 All Rights Reserved
08.03 02.99