Commissioning
CX51x0
38
Version: 1.9
Compliance with UL requirements:
• The Embedded PCs must not be connected to unlimited voltage sources.
• Embedded PCs may only be supplied from a 24 V DC voltage source. The voltage
source must be insulated and protected with a fuse of maximum 4 A (corresponding to
UL248).
• Or the power supply must originate from a voltage source that corresponds to NEC
class 2. An NEC class 2 voltage source must not be connected in series or parallel with
another NEC class 2 voltage source.
Opening and closing spring-loaded terminals:
The cables of an external voltage source are connected to the power supply unit with spring-loaded
terminals. Connect the cables as follows:
Table 25: Required wire cross-sections and strip lengths
Wire cross section
0.5 ... 2.5 mm
2
AWG 20 .. AWG 14
Strip length
8 ... 9 mm
0.33 inch
1. Open a spring-loaded terminal by slightly pushing with a screwdriver or a rod into the square opening
above the terminal.
2. The wire can now be inserted into the round terminal opening without any force.
3. The terminal closes automatically when the pressure is released, holding the wire safely and perma-
nently.
Power supply unit LEDs
The voltage sources have been connected to the power supply unit
successfully when the two upper power supply terminal LEDs light up in
green.
• The left LED (Us) indicates the supply of the basic CPU module and
terminal bus.
• The red LED (Up) indicates the Bus Terminal supply via the power
contacts.
Note
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).
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