Connecting The Panel Pc; Grounding The Panel Pc; Fig. 29 Installing Toolboard - Beckhoff CP37 1600 Series Manual

Commissioning
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Fig. 29: Installing toolboard
4.3

Connecting the Panel PC

Risk of electric shock
Dangerous touch voltages can lead to electric shock. To avoid electric shock, observe the following:
• Never connect or disconnect the device cables during a thunderstorm.
• Provide protective earthing for handling the device.
To make the panel PC ready for operation, you have to connect it. The first step is to ground the device.
Then you can connect the cables and the power supply.
An external power supply unit providing 24 V DC (-15 %/+20 %) from an isolated source is required for the
power supply. This source must be protected by a UL 248 rated fuse with a maximum rating of 4 A.
The cabling of the panel PC in the control cabinet must be done in accordance with the standard EN
60204-1:2006 PELV = Protective Extra Low Voltage:
• The PE conductor (protective earth) and the "0 V" conductor of the voltage source must be on the
same potential (connected in the control cabinet).
• Standard EN 60204-1:2006, section 6.4.1:b stipulates that one side of the circuit, or a point of the
energy source for this circuit must be connected to the protective conductor system.
Devices connected to the panel PC with their own power supply must have the same potential for the PE
and "0 V" conductors as the control panel (no potential difference).
4.3.1

Grounding the Panel PC

Potential differences are minimized and electrical currents are diverted to the ground through grounding or
potential equalization of electronic devices. This is to prevent dangerous touch voltages and electromagnetic
interference.
Protective earth
The protective grounding of a device serves to avoid dangerous touch voltages. According to the EN
60204-1 standard (Chapter 8 Potential equalization), protective grounding is required if:
• the device exceeds dimensions of 50 mm x 50 mm,
• the device can be touched or encompassed over a large area,
• contact between the device and active parts is possible,
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CAUTION
Version: 1.9
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CP37xx-1600