Function library
Acceleration, deceleration, braking, stopping
7−30
L
EDB82MV752 EN 5.2
7.5.4 DC braking (DCB)
Description
The DC−injection brake enables quick deceleration of the drive to standstill without using an external
brake resistor. The DC−injection brake can be activated via terminal or automatically.
The braking torque amounts to approx. 20...30% of the rated motor torque. It is lower than
for braking in generator mode with external brake resistor.
A brake voltage or a brake current can be selected.
Automatic DC braking improves the starting performance of the motor e.g. when operating
hoists.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0019 Operating threshold
− automatic DC
injection brake
(auto DCB)
0.10 0.00
= inactive
{0.02 Hz} 650.00 Hold time ð C0106
Deactivate automatic DC injection brake
(auto DBC):
at active lower frequency limitation
(C0239)
at operating mode C0014 = 5
7−30
C0035*
DC injection brake
(DCB) control mode
0
0 Brake voltage selection under C0036
Hold time ð C0107 7−30
1 Brake current selection under C0036
C0036 Voltage/current DC
injection brake
(DCB)
à 0.00 {0.01 %} 150.00 % à Depending on the controller
Reference M
r
, I
r
Setting applies to all mains voltages
permitted
7−30
C0106 Hold time for
automatic
DC−injection brake
(Auto DCB)
0.50 0.00
= auto DCB not active
{0.01 s} 999.00
=
Hold time, if DC−injection brake is activated
because the value falls below the setting
under C0019.
7−30
C0107 Hold time DC
injection brake
(DCB)
999.00 1.00 {0.01 s} 999.00
=
Hold time, if DC−injection brakes are
activated via an external terminal or control
word.
7−30
C0196*
Activation of
auto–DCB
0
0 Auto−DCB active, if PCTRL1−SET3 < C0019
7−30
1 Auto−DCB active, if PCTRL1−SET3 < C0019 and
NSET1−RFG1−IN < C0019
Adjustment
1. Use C0035 to select whether a brake voltage or a brake current shall be selected.
2. Enter the brake voltage or brake current under C0036 in percent.
– If C0035=0, the data refers to the rated voltage of the controller.
– If C0035=1, the data refers to the rated current of the controller.
3. Select how to activate the DC injection brake:
– Via digital input signal (configuration with C0410/15)
– Automatically when the values are fallen below the operating threshold C0019 (condition:
C0106 > 0.00 s)
Activate DC−injection braking via input signal (DCB)
Link C0410/15 with a digital signal source.
In case of HIGH−active inputs, the DC−injection braking (DCB) remains active as long as the signal
is on HIGH level.
After the hold time (C0107) has elapsed, the controller sets pulse inhibit (keypad display: ).
) Note!
In addition to the free configuration in C0410 you can also use the fixed assignment
in C0007 to link the function with a digital input.
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