5motor control (mctrl) – Lenze 8400 TopLine User Manual
Page 282
5
Motor control (MCTRL)
5.12
Braking operation/brake energy management
282
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Using the integrated brake chopper
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
B1
and R
B2
terminals of the controller.
• In
, a ramp function generator stop (FB
) can be set for instances when the
brake resistor is controlled. This prevents overvoltage deactivation in the case of short
deceleration times.
Selecting the response to an increase of the DC-bus voltage
DC-bus system
For a DC-bus connection with other devices, we recommend to connect the regenerative power
supply module to terminals +UG and –UG.
Note!
The brake transistor will be switched off if it remains switched on for a period of 4
seconds.
• If the DC-bus voltage falls under the brake chopper threshold for a short time again,
the brake transistor can switch on again for a maximum of 4 seconds, without
interruption.
• This protective function is used to prevent the brake chopper from being switched on
permanently due to e.g. too high voltages at all times or incorrect interconnection of
the bBrakeChopperOn signal
(from version V12.00.00)
.
•
From version 14.00.00
, the limitation of the operating time can be deactivated to
max. 4 seconds. For this purpose, set bit 1 to "1" in
.
The integrated brake chopper is always triggered via the DC-bus voltage with
exceedance of the "voltage threshold for braking operation" independent of the device
status.
From version 14.00.00
, the brake chopper can also be switched off at pulse inhibit or
when the "Fault" device status is activated.
• For a switch-off at pulse inhibit, set bit 7 to "1" in
• For a switch-off in the "Fault" device status, set bit 2 to "1" in
.
Note!
DC-bus system without the use of a regenerative module:
•
Up to and including version V02.xx.xx
, only one internal brake chopper can be used in
the DC-bus system to dissipate regenerative energy.
•
From version V12.00.00
, all internal brake choppers can be used in the DC-bus system
to dissipate regenerative energy ("Master-slave operation").
internal brake choppers in the DC-bus system
In order to install the regenerative module, follow the notes in the 8400 hardware
manual. The hardware manual has been stored in electronic form on the data carrier
supplied with the 8400 controller.