Assembly and connecting
CX50x026 Version: 1.9
3.4 Power supply
This power supply unit is equipped with an I/O interface, which permits connection of the Beckhoff Bus
Terminals. The power is supplied via the upper spring-loaded terminals labeled “24V” and “0V”.
The supply voltage supplies the CX system ant the terminal Bus and Bus Terminal with a voltage of 24 V DC
(-15 %/+20 %). The dielectric strength of the power supply unit is 500 V
rms
. Since the Terminal Bus (K- and
E-bus) only transfers data, a separate power supply is required for the Bus Terminals. This is provided by
means of the power contacts, which are not connected to the power supply.
Requirements for the 24V power supply
The power supply must be capable to supply 4A to guarantee proper function of CPU module and terminals.
The terminals are implemented in spring force technology. Connect the cables as follows:
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 securely and per-
manently.
Wire size width 0.5 ... 2.5 mm
2
AWG 20 .. AWG 14
Wire stripping length 8 ... 9 mm 0.33 inch
LED
If the power supply unit is connected correctly and the power supply is switched on, the two upper LEDs in
the terminal prism are green. The left LED (Us) indicates the CPU supply. The right LED (Up) indicates the
terminal supply. The other LEDs indicate the Terminal Bus status. A detailed description of the LEDs can be
found in section "LED troubleshooting".
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