
10.3
DC braking
The "DC braking" function allows the drive to be quickly braked to a standstill without the
need of using an external brake resistor.
NOTICE!
Avoid long-time activation of the "DC braking" function with a high braking current or a high
braking voltage!
Possible consequence: thermal motor overload.
▶
Only use the "DC braking" function in applications in which the load is only exceptionally
stopped.
Details
The function can be used as follows:
1
.
Automatically at motor start-up:
•
DC braking can be selected as starting method in
0x2838:001 (PAR 203/001)
.
•
At motor start-up, DC braking is then active with the braking current set in
0x2B84:001
(PAR 704/001)
for the hold time set in
0x2B84:002 (PAR 704/002)
.
•
Only when the hold time has elapsed, the motor is accelerated to the setpoint.
2
.
Automatically when the motor is stopped:
•
If the motor frequency falls below the operating threshold set in
0x2B84:003
(PAR 704/003)
when the motor is stopped, the inverter stops the deceleration process.
•
DC braking then becomes active with the braking current set in
0x2B84:001
(PAR 704/001)
for the hold time set in
0x2B84:002 (PAR 704/002)
.
3
.
Manually:
•
DC braking can be activated manually via the trigger assigned to the "DC braking" func-
tion.
4
Activating DC braking manually
^
202
•
DC braking then remains active as long as the trigger is TRUE.
Parameter
Name / value range / [default setting]
Info
0x2B84:001
(PAR 704/001)
DC braking: Current
(DC braking: Current)
0.0 ... [0.0] ... 200.0 %
Braking current for DC braking.
•
100 % ≡ rated motor current
0x6075 (PAR 323)
0x2B84:002
(PAR 704/002)
DC braking: Automatic hold time
(DC braking: Hold time autom.)
0.0 ... [0.0] ... 999.9 s
Hold time for automatic DC braking.
•
The "Automatic DC braking" function is active for the time set here.
0x2B84:003
(PAR 704/003)
DC braking: Automatic operating threshold
(DC braking: Threshold autom.)
0.0 ... [0.0] ... 599.0 Hz
Operating threshold for automatic DC braking.
•
With the setting 0, the "Automatic DC braking" function is deactiva-
ted.
0x2631:005
(PAR 400/005)
Function assignment: DC braking
(Function list: DC braking)
•
For possible settings see description for
0x2631:001 (PAR 400/001)
.
^
188
Assignment of a trigger for the "DC braking" function.
Trigger = TRUE: "DC braking" function is activated.
Trigger = FALSE: no action / deactivate function again.
4
DC braking
^
153
00 Not connected
No trigger assigned (trigger is constantly FALSE).
Additional functions
DC braking
153
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