Installing
3.2 Installing Control Unit
Converter with Control Units CU230P-2; CU240B-2; CU240E-2
Getting Started, 11/2013, A5E32885834B AA
41
Wiring the terminal strip
Damage to the inverter when using long signal cables
Using long cables at the inverter's digital inputs and 24 V power supply can lead to
overvoltage during switching operations. Overvoltages can damage the inverter.
• If you use cables of more than 30 m at the digital inputs and 24 V power supply, connect
an overvoltage protection element between the terminal and the associated reference
potential.
We recommend using the Weidmüller overvoltage protection terminal with designation
MCZ OVP TAZ DIODE 24VDC.
Danger to life as a result of hazardous voltages when connecting an unsuitable power
supply
Death or serious injury can result when live parts are touched in the event of a fault.
• For all connections and terminals of the electronic modules, only use power supplies
with protective extra low voltage (PELV), Class 2.
● Use suitable cables:
– Solid or flexible cables.
– Suitable cable cross-section: 0.5 mm² (21 AWG) to 1.5 mm² (16 AWG).
When completely connecting up the unit, we recommend cables with a cross-section
of 1 mm² (18 AWG).
● Do not use end sleeves.
● You have found an appropriate pre-assignment for the terminal strips, which you can now
use to wire the inverter.
See also Section Selecting the pre-assignment for the terminal strip (Page 33).
● You have the appropriate tools:
– Small screwdriver to open the spring-loaded terminals
– Tool for stripping the cables
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