Siemens SINAMICS G120 CU240B-2 - Page 195

Functions
7.9 Technological functions
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
195
● Evaluate the braking resistor's temperature monitoring (terminals T1 and T2) such that
the motor is switched off when the resistor has an overtemperature condition.
You can do this in the following two ways:
– Use a contactor to disconnect the inverter from the line as soon as temperature
monitoring requests it
– Specify the inverter's OFF2 command via the braking resistor's temperature
monitoring
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Figure 7-11 Braking resistor connection
You will find more information about the braking resistor in the installation instructions for
Power Module PM240
(http://support.automation.siemens.
com/WW/view/en/30563173/133300).
WARNING
If an unsuitable braking resistor is used, this could result in a fire and severely damage the
inverter.
The temperature of braking resistors increases during operation. For this reason, avoid
coming into direct contact with braking resistors. Maintain sufficient clearances around the
braking resistor and ensure that there is adequate ventilation.
Parameterizing the dynamic braking
Deactivate the V
DCmax
controller. The V
DCmax
controller is described in Section Limiting the
maximum DC link voltage (Page 179).
The dynami
c braking does not have to be parameterized any further.