Operation and maintenance instructions
CPU PROFINET Series CX06 module
5000004825
Versione 01
38
Use only power able to ensure a reliable electrical isolation of the supply voltage according
to IEC 742 / EN 60742 / VDE 0551 with a minimum strength of 4 kV isolation Protected Extra
Low Voltage, PELV.
The user must take the necessary measures to prevent damage to the system caused by non-
periodic overvoltage spikes on the power lines produced by power break to high-energy
equipment.
The voltage interruptions are permitted according to the severity level PS2.
About electromagnetic compatibility, the CPU module is designed to work in area A.
The board implements a protection against inversion of polarity on the power supply
voltage.
The power supply voltage must be within the range of 24V±10%.
The rated voltage of the CPU module is 24 VDC -15% / + 20% (as indicated by the Standard
IEC 61131-2). If the loads connected to the initial node may require severest tolerances of
the value of the supply voltage, the power supply voltage must comply with these. If the
inputs connected to the initial node may require in the severest tolerances of the value of
the supply voltage, the logic supply voltage of the node must comply with these.
For example, if you connect the valves HN Series, the tolerance of the power supply voltage
must be ± 10%. If you connect the CSH sensors with power supply 10-30V (-58% / + 25%),
the tolerance of the logic supply voltage is -15% / + 20%.
For the system it is mandatory to connect the logic voltage (pin 1), otherwise the initial
module remains off.
For the correct operation of the system is mandatory to connect to the initial module the
logic voltage (pin 1), the power voltage (pin 2), the reference to 0 V (GND, pin 3) and the
earth.
On supply cables of a valve group, it produces a voltage drop that dependent by load. This
can create that the supply voltage (logic and power) does not fall within the allowable
tolerance. If the sections of the cables for the power supply and for the logic power supply
are the same, it is possible to apply the following formula in order to calculate the length. To
limit the effects of induced noises, it is recommended to limit the length of the power cable
to 3 mt.
Before is necessary to calculate:
o
The maximum current value for Logic+Input (I1) and for Power (I2)
o
The minimum power supply value expected during operation (Vmin), whereas it
depends on the load connected and that the mains voltage can have oscillations.
Use the value below in the following formula explained by the electrical drawing.
