Mains Voltage - Siemens SINUMERIK 840D sl Manual

Connections
9.4 Power supply
9.4.3

Mains voltage

Rules for the line voltage
The following list indicates what you must take into account for the line voltage:
● For stationary installations or systems that do not have all-pole line disconnect switches,
● For load power supplies and power supply modules, the rated voltage range set must
● For all electrical circuits, the fluctuation/deviation of the line voltage from the rated value
24 V DC supply
For...
Buildings
24 V DC supply lines, signal
lines
24 V supply
Protection against external electrical phenomena
The table below shows how you must protect your system against electrical interference or
faults.
Table 9-1
For ...
All plant or systems in which the component is
installed
Supply, signal, and bus lines
Signal and bus lines
76
the building installation must include a line disconnect switch or a fuse.
correspond to the local line voltage.
must be within the permissible tolerance (please refer to the technical specifications for
the SINAMICS modules).
External electrical phenomena
Requirement
External lightning protection
Internal lightning protection
Safe (electrical) isolation of low voltage
Requirement
The plant or system is connected to a protective
conductor for the discharge of electromagnetic
interference.
The wiring arrangement and installation complies
with EMC regulations.
A cable or wire break cannot lead to undefined
states in the plant or system.
Take lightning protection
precautions (e.g., lightning
conductors)
Manual, 07/2007, 6FC5397-0AP10-2BA0
NCU