Functions
8.15 Brake functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-85
Sequence 2
1. Enabled and selected using BICO parameter P1230 (see figure below).
2. The inverter pulses are inhibited for the duration of the de-magnetizing time P0347.
3. The requested braking current P1232 is impressed as long as DC braking is enabled
(P1230 = 1) and the motor is braked. This state is displayed using signal r0053 bit 00.
4. After DC braking has been cancelled, the motor accelerates back to the setpoint
frequency until the motor speed matches the inverter output frequency. If there is no
match, then there is danger that a fault will be output as a result of overcurrent - F0001.
This can be avoided by activating the flying restart function.
5. If any fault occurs during P1230 = 1 the DC current is set to zero. The motor doesn't ramp
up even the fault is acknowledged. A new ON command is necessary.
6. If the DC brake is enabled again, the braking current P1232 is impressed as long as
P1230 = 1.
.
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21
Figure 8-58 DC braking after external selection
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