Functions
8.15 Brake functions
Control Units CU240S
8-84 Operating Instructions, 11/2006, A5E00766042B AA
Sequence 1
1. Enabled using P1233
2. DC braking is activated with the OFF1 or OFF3 command (see figure below)
3. The inverter frequency is ramped down along the parameterized OFF1 or OFF3 ramp
down to the frequency at which DC braking is to start - P1234. This means that the kinetic
energy of the motor can be reduced without endangering the inverter. However, if the
ramp-down time is too short, there is a danger that a fault will be output as a result of an
overvoltage condition in DC link - F0002.
4. The inverter pulses are inhibited for the duration of the de-magnetizing time P0347.
5. The required braking current P1232 is then impressed for the selected braking time
P1233. The status is displayed using signal r0053 bit 00.
The inverter pulses are inhibited after the braking time has expired.
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3
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3
3
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Figure 8-57 DC braking after OFF1/OFF3
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