Lenze i410 - DC Braking

9.3.2 DC braking
The "DC braking" funcon generates a braking torque by injecng a DC current into the motor.
The
funcon can be used to shorten the braking of a load with high mass inera. Another
applicaon is holding the motor sha before starng or while stopping.
NOTICE
Avoid long-me
acvaon of the "DC braking" funcon with a high braking current or a high
braking voltage!
Possible consequence: thermal motor overload.
▶
Only use the "DC braking" funcon with applicaons in which the load is only occasionally
stopped.
▶
Do not acvate the "DC braking" funcon longer than necessary.
Condions
The "DC braking" funcon can only be acvated if the inverter is enabled.
This funcon is not available for the SL-PSM motor control mode 0x2C00 (P300.00).
Details
The
funcon can be used as follows:
1.
Automacally when the motor is started.
2.
Automacally when the motor is stopped.
3.
Manually (via the exible I/O conguraon).
The three opons can also be combined, for instance automac DC braking when starng and
s
topping the motor.
For further details and conguraon examples, see the following subchapter:
4Ex
ample: Automac DC braking when starng the motor ^ 159
4Example: Automac DC braking when stopping the motor ^ 160
4Acvang DC braking manually ^ 162
4Migraon of Lenze Inverter Drives 8200/8400 ^ 164
Parameter
Address Name / seng range / [default seng] Informaon
0x2B84:001
(P704.01)
DC braking: Current
(DC br
aking: Current)
0.0 ... [0.0] ... 200.0 %
Braking current for DC braking.
•
100 % = rated motor current 0x6075 (P323.00)
0x2B84:002
(P704.02)
DC braking: Automac hold me
(DC braking: Hold me autom.)
0.0 ... [0.0] ... 1000.0 s
Hold me for automac DC braking.
•
The "Automac DC braking" funcon is acve for the me set here.
•
1000.0 = innite
Note!
Do not set this parameter to the value "1000.0" (innite) if the DC
braking is used during the start. The "Innite" seng can be used to lock
the rotor for an indenite me while a stop is acve. However, ensure
here that the longer DC braking does not cause a thermal overload of
the motor!
0x2B84:003
(P704.03)
DC braking: Automac operang threshold
(DC braking: Threshold autom.)
0.0 ... [0.0] ... 599.0 Hz
Operang threshold for automac DC braking.
•
With the seng 0, the "Automac DC braking" funcon is
deacvated.
0x2B84:004
(P704.04)
DC braking: Demagnezaon me
(DC braking: Demagnet. me)
0 ... [100] ... 150 %
•
From version 04.00
In the default seng, the DC braking is acvated aer the standard
demagnesing me has elapsed. This parameter can be used to adapt
the me.
•
100 % = De
fault
demagnezaon me 0x2B84:005 (P704.05)
Note!
A too short demagnesing me can cause an overcurrent error!
0x2B84:005
(P704.05)
DC braking: Default demagnezaon me
(DC braking: Def. demag. me)
•
R
ead only: x ms
•
From version 04.00
Display of the standard demagnesing me as a seng help for the user.
•
This me is calculated by the inverter: Demagnesing me = 7 * rotor
me constant
Conguring the motor control
P
arameterisable motor funcons
DC braking
158