Functions and Technical Specifications
4-13
EM 148-FC
Frequency Converter
A5E00065321-03
External brake control
This parameter defines the behavior of the braking relay.
Disable:
The braking relay always remains released. If there is an external brake
nevertheless, it blocks continuously. The External brake release delay and
External brake stopping time parameters are ignored.
Enable:
The braking relay picks up when the converter output controls the motor and
releases again as the motor comes to a standstill. The External brake release
delay and External brake stopping time parameters are taken into account.
External brake release delay
After it has been switched on, the frequency converter works with the minimum
motor frequency for the time set here until the braking relay picks up and ramp up
begins.
Release delay
Brake
0
f
min
f
setpoint
f
max
f
1
0
Switch on
t
Figure 4-2
Frequency curve with release delay
Note
The value for the External brake release delay parameter should be slightly
greater than the time actually required to release the external brake.
Содержание SIMATIC EM 148-FC
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Страница 66: ...Mode of Functioning 5 10 EM 148 FC Frequency Converter A5E00065321 03 ...
Страница 70: ...Dimensioned Drawing B 2 EM 148 FC Frequency Converter A5E00065321 03 ...
Страница 76: ...4 Product Information on Manual EM 148 FC Frequency Converter Edition 04 2003 A5E00476687 03 ...