Eaton PowerXL DC1, Manual

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6 Parameters
6.2 Digital and analog inputs
DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
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6.2.11 Braking
Various braking functions can be configured:
• DC braking,
• Generative braking (brake chopper),
• mechanical braking (actuation).
The brake functions allow you to reduce undesired coasting and long coast-
ing times. Mechanical braking also ensures safe operating states.
6.2.11.1 DC-braking
With DC braking, the frequency inverter supplies the three-phase stator
winding of the three-phase motor with DC current. This generates a station-
ary magnetic field which induces a voltage in the rotor while the rotor is in
motion. As the electrical resistance of the rotor is very low, even small induc-
tion can generate high rotor currents and thus a strong braking effect.
As the speed slows down, the frequency of the induced voltage and with it
the inductive resistance drops. The resistive load becomes more effective
and increases the braking effect.
￫
DC braking is not suitable for holding loads or for intermediate
braking. Nor for intermediate braking.
NOTICE
DC braking will cause increased motor heating. Accordingly,
make sure to configure a braking torque that is as low as possi-
ble using the voltage amplification (P-11) and braking duration
(P-32) parameters.