Power Supply - Siemens SIMATIC NET SCALANCE X-100 Operating Instructions Manual

Connecting up

6.2 Power supply

Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or combustible
atmosphere is present.
Safety notices when using the device according to Hazardous Locations (HazLoc)
If you use the device under HazLoc conditions you must also keep to the following safety
notices in addition to the general safety notices for protection against explosion:
EXPLOSION HAZARD
You may only connect or disconnect cables carrying electricity when the power supply is
switched off or when the device is in an area without inflammable gas concentrations.
Safety notices for use according to ATEX and IECEx
If you use the device under ATEX or IECEx conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
6.2 Power supply
The power supply is connected using a 4-pin plug-in terminal block. The power supply can be
connected redundantly. Both inputs are isolated. There is no distribution of load. When a
redundant power supply is used, the power supply unit with the higher output voltage supplies
the device alone. The power supply is connected over a high resistance with the enclosure to
allow an ungrounded set up. The two power supplies are non-floating.
The following figure shows the position of the power supply of the SCALANCE X-100 IE
switches and the assignment of the terminal block.
36
WARNING
WARNING
WARNING
Operating Instructions, 02/2019, A2B00060666-10
SCALANCE X-100