CDA3000 Operation Manual
3-9
3 Electrical installation
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3.6 Braking
resistor (RB)
In regenerative operation, such as braking the drive, the motor feeds
power back into the inverter. This increases the voltage in the DC-link. If
the voltage exceeds a threshold value, the internal braking transistor is
activated and the regenerated power is converted into heat by way of a
braking resistor.
The switching transistor is installed as standard. The design of the exter-
nal braking resistor depends on a number of drive factors: for example the
load to be moved, the required dynamics of the drive or the braking and
cycle duration.
Note: The design of the braking resistor must be clarified at the
project planning stage. Please talk to us!
Attention: In version
CDA3X.xxx, Wx.x, BR
the braking resistor is built-in. No additional braking resistor
may be connected to terminals X1/L+ and RB; this would
damage the inverter module.
Figure 3.6 Connection Braking resistor
X1
L+
RB
RB
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