Power supply
Notice | |
Damage to the Embedded PCs The Embedded PCs may be damaged during wiring. The cables for the power supply should only be connected 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 one point of the energy source for this circuit must be connected to the protective earth conductor system.
Connection example with basic CPU moduleCX20x2 and CX2100-0014 power supply unit:
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: Technical data).
- 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 has (no potential difference).