Siemens CU240B-2 - Wiring the Terminal Strip

Installing
4.6 Installing Control Unit
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
115
4.6.5
Wiring the terminal strip
WARNING
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 boards, only use power supplies that
provide PELV (Protective Extra Low Voltage) or SELV (Safety Extra Low Voltage)
output voltages.
WARNING
Danger to life due to electric shock caused by sparkovers to the motor temperature sensor
cable
Voltage flashovers to the electronics of the inverter can occur in motors without safe
electrical separation of the temperature sensors in accordance with IEC 61800-5-1 when
the motor develops a fault.
• Install a temperature monitoring relay 3RS1… or 3RS2…
• Evaluate the temperature monitoring relay output using a digital input of the inverter,
e.g. using the "External fault" function.
You can find additional information about the temperature monitoring relay on the Internet:
Manual 3RS1 / 3RS2 temperature monitoring relays
(https://support.industry.siemens.com/cs/ww/en/view/54999309)
Note
If your application requires UL certification, please note that the power supply of the digital
output must comply with specific specifications.
Technical data (Page 423)
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.