Siemens CU240B-2 - Wiring the Terminal Strip

Installing
3.3 Installing Control Unit
Converter with Control Units CU230P-2; CU240B-2; CU240E-2
32 Getting Started, 04/2014, A5E32885834B AB
3.3.4
Wiring the terminal strip
NOTICE
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.
Procedure
Proceed as follows to connect the terminal strips:
1. Use a cable with the recommended cross-section, which has been appropriately prepared
for use:
Solid or flexible cable
Flexible conductor with non-insulated end sleeve
Flexible conductor with partially-insulated end sleeve
Only permitted for CU240B/E-2:
Two flexible cables with the same cross-section with partially
insulated twin end sleeves
2. 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.
See also:EMC installation guideline
(http://support.automation.siemens.com/WW/view/en/60612658)
3. Use the shield connection plate of the Control Unit as strain relief, also see:Overview of
the shield connection kits
(http://support.automation.siemens.com/WW/news/en/67225884).
You have connected the terminal strip.