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4.2.5 Interrupting the start or stop process
If the start command is deactivated again before the start sequence has been com-
pleted, the last step of the start sequence is canceled again immediately. After this,
the sequence for stopping commences, starting with this condition.
Example:
If the start command is deactivated (current monitoring is active, waiting for the re-
lease of the brake) during the expiry of time t
3
, the minimum current monitoring is
deactivated straight away. After expiry of time t
11
the power parts are blocked.
T
a
T
b
t
2
t
1
t
11
t
15
start command
activation
safety contactor
activation
holding brake
motor current
monitoring
motor current
reference frequency
If a new start command is given before the sequence for stopping has ended, the last
step of the sequence is canceled immediately. The described start sequence then
commences, starting with this condition.
4.2.6 Occurrence of a malfunction
If the frequency inverter switches off due to a malfunction, the signals to release the
brake and close the safety switch are deactivated immediately. After acknowledgment
of the malfunction, the drive can be started again. The same steps take place as in
the start process.
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