5 Motor control (MCTRL)
5.13 Braking operation/brake energy management
296
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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Fast discharge of the DC bus
The bBrakeChopperOn control input of the "brake chopper master" can be optionally used for a fast
discharge of the DC bus after the supply voltage has been switched off. The FB interconnection f the
"brake chopper master" has to be adapted so that the bBrakeChopperOn control input of the
SB LS_MotorInterface
is connected to a digital bus or hardware signal (e.g. digital input on HIGH
level).
Note!
If the brake chopper master-slave operation is activated, plausibility monitoring is
carried out in the "brake chopper slaves":
• The brake transistor can only be switched on via the bBrakeChopperOn control signal
if the DC-bus voltage is greater than the brake chopper threshold minus 40 V
DC
.
•Exception:
From a mains voltage of 513 V
AC
(or 725 V
DC
) and a mains voltage of 480
V or 500 V set in C00173
, the plausibility monitoring is not effective anymore.
Note!
Only the brake transistor of the "brake chopper master" is switched on with this function
(max. 4 seconds, without interruption).
A complete discharge of the DC-bus cannot be achieved using this function!
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 C02864/1
.
• We recommend this setting when this function is used in order to achieve a higher
discharge of the DC bus - especially in case of high device power.
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