8400 StateLine C | Reference manual
Motor control (MCTRL)
Braking operation/brake energy management
230 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
Short overview of the relevant parameters:
How to set the "inverter motor brake" function for an oscillation-reduced
operation:
For V/f characteristic open-loop control/closed-loop control (VFCplus):
• Set reduced brake chopper threshold (C00174
) to approx. 70 V.
• Set additive speed (C00987
) to rated slip speed.
• Adapt the deceleration ramp so that the deceleration time is slightly below
(10 ... 30 %) the deceleration time that can be realised with the inverter motor
brake.
For sensorless vector control (SLVC):
• Set reduced brake chopper threshold (C00174
) to approx. 50 V.
• Set additive speed (C00987
) to 1 ... 2-fold rated slip speed.
• Adapt the deceleration ramp so that the deceleration time is slightly below
(10 ... 30 %) the deceleration time that can be realised with the inverter motor
brake.
Parameter Info Lenze setting
Value Unit
C00173 Mains voltage 3ph 400V / 1ph 230V
C00174
Reduc. brake chopper threshold 0 V
C00175
Resp. to brake resistor control Brake resistor
C00987
Inverter motor brake: nAdd
• Speed lift which is connected in pulses to the
brake rampe when the motor is braked.
80 rpm
C00988
Inverter motor brake: PT1 filter time
• PT1 filter time for smoothing the speed lift which
is added in pulses.
0.0 ms
Note!
When the "inverter motor brake" function is used, torque oscillations occur
which have may have a negative effect on the service life of the components of
the mechanical drive train (e.g. gearbox).
• The extent of the occurring oscillations depends on the drive train (mass
inertia, natural frequencies, etc.) and the function setting.
• We recommend optimising the "inverter motor brake" function for an
oscillation-free operation as described in the following. Usually, this setting
does not cause any torque oscillations which affect the service life of the
gearbox.
• The settings of implementing a maximum acceleration ramp are only
recommended if the inverter motor brake is used infrequently (e.g. in case of
quick stop).
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