Parameter descriptions
7.3.6 Direct current brake
631 Braking Current
632 Braking Time
Stopping behavior 7 (Parameter Operation Mode 630) includes the direct current brake. Using the
direct current brake a motor can be decelerated faster than without direct current brake. By impress-
ing a direct current part into the motor the losses inside the motor are artificially increased. The im-
pression of the
Braking Current 631 results in the motor heating up and should only be done for a
short period in the case of internally ventilated motors.
631 Braking Current 0.00 A √2⋅I
√2⋅I
I
FIN
: Nominal value of frequency inverter
For the application of the Direct current brake the parameter
Configuration 30 must be set to “110 -
IM: sensor-less control” (control in accordance with V/f-characteristic).
The setting of the parameter
Braking Time 632 defines the time-controlled stopping behavior. Con-
tact-controlled operation of the direct current brake is activated by entering the value zero for the
Braking Time 632.
Time controlled:
The direct current is controlled by the status of the signals Start clockwise and Start anticlockwise.
The current set by the parameter
Braking Current 631 flows until the time set by the parameter
Braking Time 632 has expired.
For the duration of the braking time, the combined control signals Start clockwise and Start anticlock-
wise must be logical 0 (Low) or 1 (High).
Contact-controlled:
If the parameter
Braking time 632 is set to the value 0.0 s, the direct current brake is controlled by
the Start clockwise and Start anticlockwise signals. The time monitoring and limitation by
Braking
Time
632 are deactivated. The braking current will be impressed until the controller enable control
signal (STOA and STOB) becomes logical 0 (low).
No. Description Min. Max. Fact. sett.
633 Demagnetizing time
To avoid current surges, which can possibly lead to an error switch-off of the frequency inverter, a
direct current may only be impressed into the motor after the motor has been demagnetized. As the
demagnetization time depends on the motor used, it can be set with the parameter
Demagnetizing
time
633.
The selected demagnetizing time should be approximately three times the
Act. Rotor Time Con-
stant
227.
634 Amplification
635 Integral Time
The selected stopping behavior is supplemented by a current controller to control the direct current
brake. The PI controller controls the current impression of the parameterized
Braking Current 631.
The proportional and integrating part of the current controller can be set via parameters
Amplification
634 and Integral Time 635. The control functions can be deactivated by setting the parameters to 0.
131
Operational Behavior 06/2013 Operating Instructions
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