Electrical connection
MP85A A0293_06_E00_03 HBM: public 21
5 Electrical connection
5.1 General notes on connection
The MP85A process controller operates on safety extra low voltage (SELV,
supply voltage 18 … 30 V
DC
). This voltage can also supply one or more further
loads inside a control cabinet. If the device is running on a DC voltage
network
1)
, you must take additional precautions to dissipate surges.
To ensure sufficient immunity to interference, the bus lines (CAN bus and
PROFIBUS DP in the MP85ADP(-S)) must be shielded twisted-pair cables.
Use at least Cat 5 cables for Profinet. The transducer cables must also be
shielded. Connect the shield of the transducer cable to the MP85A process
controller using the shortest possible cable (t5 cm) and a Faston blade
connector (4.8 mm).
Shield the power supply and digital control input/output connection cables as
well, if the cables are longer than 30 m or are routed outside closed buildings.
Notice
Electrostatic discharges can lead to malfunctions or failure of the device. This
is indicated by the following symbol on the device:
Touch a grounded metal component before touching the device or use a
grounding strip during installation if necessary.
1)
Distribution system for electrical energy that covers a large physical area (e.g. several control
cabinets), which may also supply loads with large nominal currents.
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