Brake Chopper - ABB +N5600 Firmware Instructions

114 Program features
Level [V DC (% of U
DCmax
Overvoltage fault limit
Overvoltage control limit
Internal brake chopper at 100%
pulse width
Internal brake chopper at 0%
pulse width
Overvoltage warning limit
U = DC voltage at upper
DCmax
bound of supply voltage range
DC voltage at lower bound of
supply voltage range
Undervoltage control and
warning limit
Charging activation/standby
limit
Undervoltage fault limit
*489 V with frames R1...R3, 440 V with frames R4...R8.
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 of ACS880 drives start conducting when the DC link
voltage reaches 1.156 × U
U , depending on supply voltage range – see table under
DCmax
trip limits above. (U
supply voltage range.) For information on external brake choppers, refer to their
documentation.
Note: For runtime braking, overvoltage control (parameter
needs to be disabled for the chopper to operate.
Settings
Parameters 01.11 DC voltage
parameter group 43 Brake chopper
Supply voltage range [V AC] (see
)] 208...240 380...415
489/440*
405 (125) 700 (125)
403 (124) 697 (124)
375 (116) 648 (116)
373 (115) 644 (115)
324 (100) 560 (100)
281
239 (85)
225 (80)
168 (60)
(page 152),
(page 300),
(page 474).
. 100% pulse width is reached at approximately 1.2 ×
DCmax
is the DC voltage corresponding to the maximum of the AC
DCmax
(page 152) and
(page 355).
440...480
800 878
810 (125)
806 (124)
749 (116)
745 (115)
648 (100)
513 594
436 (85) 505 (85)
410 (80) 475 (80)
308 (60) 356 (60)
30.30 Overvoltage control
95.01 Supply voltage
30.30 Overvoltage control
95.01 Supply voltage)
500 525...600
880 1113
810 (120) 1013 (125) 1167 (125)
806 (119) 1008 (124) 1159 (124)
780 (116) 936 (116)
776 (115) 932 (115)
675 (100) 810 (100)
675 709
574 (85) 602 (85)
540 (80) 567 (80)
405 (60) 425 (60)
(page 300),
(page 473), and
Voltage control and
30.30 Overvoltage
(page 300);
660...690
1218
1077 (116)
1071 (115)
932 (100)
891
757 (85)
713 (80)
535 (60)
95.02
control)