Braking Operation/Brake Energy Management - Lenze L-force HighLine C 8400 Series Reference Manual

5.13

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 ramp function generator if brake chopper threshold exceeded
(RFG_Stop)
 Use of the "Inverter motor brake" function
 Combination of the above named options
In the case of inverters with a 3-phase supply, the following is also possible:
 Coupling of the inverters in a DC-bus connection
 Recovery of regenerative energy with a regenerative module

Stop!
If the connected brake resistor is smaller than required, the brake chopper can be
destroyed!
Appropriate protective measures are provided in the subchapter
thermal overload of the brake

Note!
• We recommend to use the brake chopper (brake transistor) which is
integrated into the controller for the braking operation, regardless of the
selected motor mode.
– Connect the required brake resistor to the R
• For a DC-bus connection with other devices, we recommend to connect the
regenerative power supply module to terminals +UG and –UG.
• If none of these measures is taken, e.g. the overvoltage deactivation ("OU")
may respond in case of low deceleration times during regenerative operation.

To install the regenerative module, follow the instructions in the 8400 hardware
manual.
• The hardware manual has been stored in electronic form on the data carrier
supplied with the 8400 drive controller.
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controller.
Error messages of the operating system
L
8400 HighLine C | Reference manual
Braking operation/brake energy management
(from version 04.00.00)
resistor".
( 287)
and R
B1
( 580)
Motor control (MCTRL)
"Avoiding
terminals of the
B2
279