Installing the CPU 41x-2 PCI and the Software
Windows Automation Center, WinAC Slot Version 4.0
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
33
Requirements for External Connection to 24 VDC
If you connect the CPU 41x-2 PCI externally to an independent 24 VDC power
supply, all of the 24 VDC supplied must be generated as safety extra-low voltage
(SELV).
The 24 VDC power supply must conform to LPS (Limited Power Source) or NEC
Class 2. If the 24 VDC power supply does not conform to LPS or NEC Class 2, the
CPU 41x-2 PCI must be operated in restricted access locations.
Warning
Personal injury and property damage can occur.
If you configure the 24 VDC supply for the CPU 41x-2 PCI incorrectly,
components can be damaged and personal injury can result.
The 24 VDC supply must satisfy the following requirements:
Only extra-low voltage that is safely isolated from the supply system can be
used. Safe isolation can be achieved, for example, by following the
requirements in VDE 0100 Part 410 / HD 384-4-41 / IEC 364-4-41 (as
functional extra-low voltage with safe isolation) or VDE 0805 / EN 60950 / IEC
60950 (as safety extra-low voltage) or VDE 0106 Part 101.
Cable for Connecting the 24 VDC to the CPU 41x-2 PCI
The cable must comply with the following boundary conditions:
•
< 2 m: 0.5 mm
2
to 2.5 mm
2
cross section
•
> 2 m: 0.75 mm
2
to 2.5 mm
2
cross section
Connecting the CPU 41x-2 PCI to an External 24 VDC Supply (Optional)
1. A 2-pin connector equipped with a screw terminal is shipped with the CPU 41x-
2 PCI.
Connect L+ to 24 VDC and M to ground (see slot bracket for marking).
2. Insert the 2-pin connector onto the slot bracket of the CPU 41x-2 PCI.
