Operating Instructions

NOTICE
Overvoltages for 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.
Table 4-32 Permissible cables and wiring options
Solid or finely stranded conduc‐
tor
Finely stranded conductor with
non-insulated conductor end
sleeve
Finely stranded conductor with
partially insulated conductor end
sleeve

PP

PP

PP

PP
PP

PP
Cables with twin end sleeves are not permissible.
Wiring the terminal strip in compliance with EMC
● If you use shielded cables, then you must connect the shield to the mounting plate of the
control cabinet or with the shield support of the inverter through a good electrical connection
and a large surface area.
Further information about EMC-compliant wiring is available on the Internet:
EMC installation guideline (http://support.automation.siemens.com/WW/view/en/
60612658)
● Use the shield connection plate of the Control Unit to connect the shield as strain relief.
Control Units (Page 33)
Installing
4.5 Connecting the interfaces for the inverter control
Converter with the CU230P-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257946B AF 141