Brake Chopper - ABB ACS580 Firmware Manual

The following table shows the values of selected DC bus voltage levels in volts. All
voltages are relative to the supply voltage range selected in parameter
voltage.
Level
Overvoltage fault limit
Overvoltage control limit
Internal brake chopper at 100% pulse width
Internal brake chopper at 0% pulse width
Overvoltage warning limit
DC voltage at upper bound of supply voltage range
(U )
DCmax
DC voltage at lower bound of supply voltage range
(U )
DCmin
Undervoltage warning limit
Undervoltage control limit
Charging activation/standby limit
Undervoltage fault limit
Settings
Parameters 01.11 DC voltage
30.31 Undervoltage control
Adaptive voltage limits


Brake chopper

A brake chopper can be used to handle the energy generated by a decelerating
motor. When the DC voltage rises high enough, the chopper connects the DC circuit
to an external brake resistor. The chopper operates on the pulse width modulation
principle.
The internal brake choppers in the drive (in frames R0...R3) start conducting when
the DC link voltage reaches approximately 1.15 × U
width is reached at approximately 1.2 × U
corresponding to the maximum of the AC supply voltage range.) For information on
external brake choppers, refer to their documentation.
Note: Overvoltage control needs to be disabled for the chopper to operate.
Settings
Parameter 01.11 DC voltage
273).
(page 139),
(page 228), 95.01 Supply voltage
(page 306).
(page 139); parameter group
Supply voltage range [V]
(see 95.01 Supply
200...240 380...415
421 842
390 780
390 780
378 760
373 745
324 560
230 513
239 436
211 385
183 334
126 231
30.30 Overvoltage control
. 100% maximum pulse
DCmax
. (U is the DC voltage
DCmax DCmax
43 Brake chopper
Program features 121
95.01 Supply
voltage)
440...480 575...600
842 1053
780 974
780 974
760 949
745 932
648 810
594 709
505 60
446 532
386 461
267 319
(page 228),
(page 305) and 95.02
(page