8400 motec | Software Manual
Motor control (MCTRL)
Braking operation/braking energy management
114 L Firmware ≤ 02.00 - DMS 2.1 EN - 03/2011
5.11.3 Response to an increase of the DC-bus voltage
If the brake chopper threshold resulting from C00173
and C00174 is exceeded in the DC
bus, the reaction selected in C00175
takes place (use of the brake resistor and/or stop of
the ramp function generator and/or stop of the deceleration).
Optimum following of the actual speed value until the speed setpoint is reached (e.g.
the motor is stopped rapidly) is always achieved with the help of a brake resistor.
Stopping the deceleration enables a smoother braking with lower dynamics and torque
oscillation.
From version 02.00.00, C00175
= 4 provides for the inverter motor brake. This function
enables a quick braking without using a brake resistor. Depending on the procedure,
torque oscillations may occur.
Stop!
• Both braking methods "Stop of deceleration" and "Inverter motor brake" can
only be used for speed-controlled applications without the influence of a
position controller!
• When the "Inverter motor brake" function is used, the Motor load monitoring
(I2xt) is not adapted. If it is braked too frequently, there is a risk of the motor
being thermally overloaded or the motor overload monitoring does not work
properly!
• The "inverter motor brake" function
– must not be used with vertical conveyors (hoists) or active loads!
– is not available with sensorless vector control.
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