8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
204 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.9.5.1 Manual DC-injection braking (DCB)
DC-injection braking can be activated manually for the two technology applications
"Actuating drive speed" and "Switch-off positioning" by connecting the bSetDCBrake input
of the LA_NCtrl or LA_SwitchPos application block to a digital signal source (e.g. via the
digital signal source bCtrl1_B3 of the port block LP_CANIn1).
For HIGH-active inputs, DC-injection braking is active as long as the signal is at HIGH
level.
After the hold time (C00107
) has expired, the controller sets the pulse inhibit (CINH).
5.9.5.2 Automatic DC-injection braking (auto DCB)
"Automatic DC-injection braking" (referred to in the following as "auto DCB") can be used
if there is a requirement that the drive be isolated from the supply at n
≈ 0.
Function
For understanding the auto DCB function, it is necessary to distinguish between three
different types of operation:
A. The drive has been enabled and, in the course of operation, the speed setpoint falls
below the auto DCB threshold.
– In case of operation without
speed feedback, a braking current (C00036) is injected.
After the auto DCB hold time (C00106
) has expired, the motor is deenergised via the
auto DCB function, i.e. a controller inhibit (CINH) is set.
– In case of operation with
speed feedback, the motor is deenergised via the auto DCB
function after the auto DCB hold time (C00106
) has expired, i.e. a controller inhibit
(CINH) is set.
The braking current which can be parameterised in C00036
does not have any effect
during operation with speed feedback.
B. When the controller is enabled, the drive is at standstill (n = 0).
If the enabled drive is to start, the speed setpoint passed via the acceleration ramp
must exceed the auto DCB threshold (C00019
). Below this threshold, the motor will not
be energised.
Note!
Deactivate automatic DC-injection braking when a holding brake is used!
• For this purpose, go to C00019
and set the auto DCB threshold to "0".
• Background: Controller inhibit is already activated by the Holding brake
control. ( 362)
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