Frequency Curve With Release Delay - Siemens SIMATIC EM 148-FC Manual

External brake control
This parameter defines the behavior of the braking relay.
S 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.
S 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.
f
setpoint
Brake
Figure 4-2
Note
The value for the External brake release delay parameter should be slightly
greater than the time actually required to release the external brake.
EM 148-FC Frequency Converter
A5E00065321-03
f Switch on
f
max
f
min
0
1
0

Frequency curve with release delay

Functions and Technical Specifications
Release delay
t
4-13