Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 101)

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*
v
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) а 0.00 {0.01 %} 150.00 % а 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*
v
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:
c).
)
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.