Lenze 8400 TopLine - Manual (Page 288)

5 Motor control (MCTRL)
5.12 Braking operation/brake energy management
288
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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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) and servo control (SC):
• 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).