Lenze 8400 motec - Manual (Page 163)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 163
5 Motor control (MCTRL)
5.12 Braking operation/brake energy management
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5.12 Braking operation/brake energy management
When electric motors are braked, the kinetic energy of the drive train is fed back into the DC circuit
regeneratively. This energy leads to an increase in the DC bus voltage. In order to avoid overvoltage
in the DC bus, several different strategies can be used:
• Use of a brake resistor
• Stopping of the deceleration when the brake chopper threshold is exceeded (HlgStop)
• Use of the "inverter motor brake" function
(from version 02.00.00)
• Overmagnetising the motor (from version 02.00.00)
• Combination of the above named options
Short overview of the relevant parameters:

Stop!
If the connected brake resistor
• has a lower brake resistance value than the required brake resistor, the brake chopper
may be destroyed!
• has a too low thermal power dissipation, the brake resistor may be destroyed!
C00574 serves to parameterise the error response of the brake resistor monitoring.
 Brake resistor monitoring (I2xt) ( 177)
Parameter Info Lenze setting
Value Unit
Basic settings
C00173 Mains voltage 3ph 400 V
C00175 Resp. to brake resistor control Brake resistor
Brake resistor
C00129 Brake resistance value
(dependent on the device power, see subchapter
" Settings for internal brake resistor ")
220.0 Ohm
C00130 Rated brake resistor power 15 W
C00131 Thermal capacity - brake resistor 0.6 kWs
C00133 Brake resistor utilisation - %
C00572 Threshold - brake resist. overload 100 %
C00574 Resp. to brake resist. overtemp. Fault
Inverter motor brake (variant 1)
C00987 Inverter motor brake: nAdd 80 rpm
Inverter motor brake (variant 2)
C00984 Inverter motor brake: Motor flux Add 20.0 %
Highlighted in grey = display parameter