Commissioning
CX20x3
36
Version: 1.0
6.3
Power supply
NOTE
Damage to the Embedded PCs
The Embedded PCs may be damaged during wiring. The cables for the power supply should only be con-
nected in de-energized state.
The power supply units require an external voltage source, which provides 24 V DC (-15% /+20%).
The cabling of the Embedded PC in the control cabinet must be done in accordance with the standard EN
60204-1:2006 PELV = Protective Extra Low Voltage:
• The "PE" and "0 V" conductors of the voltage source for a basic CPU module 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 earth conductor system.
Connection example with CX2033 basic CPU module and CX2100-0014 power supply unit:
Fig. 21: Connections for system voltage (Us) and power contacts (Up).
Table 26: Legend for the connection example.
No.
Description
1
The upper spring-loaded terminals identified with "24 V" and "0 V" supply the basic CPU
module and the terminal bus (data transfer via K- or E-bus).
2
The spring-loaded terminals identified as "+", "-" and "PE" supply the Bus Terminals via
the power contacts and the sensors or actuators connected to the Bus Terminals.
Fuse
• When dimensioning the fuse for the system voltage (Us), observe the maximum power consumption of
the Embedded PC (see:
• Protect the power contacts (Up) with a fuse with a max. rating of 10 A (slow-blow).
Interrupting / switching off the power supply
To switch off the Embedded PC, do not disconnect the ground (0 V), because otherwise current may
continue to flow via the shielding, depending on the device, and damage the Embedded PC or peripheral
devices.
Always disconnect the 24 V line. Devices connected to the Embedded PC, which have their own power
supply (e.g. a Panel) must have the same potential for "PE" and "0 V" as the Embedded PC have (no
potential difference).
