ABB ACS860 - Brake Chopper

64 Program features
Settings
Parameters 01.11 DC voltage (page 95), 30.30 Overvoltage control (page 200), 30.31
Undervoltage control (page 200), 95.01 Supply voltage (page 287), and 95.02
Adaptive voltage limits (page 288).
 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.
For information on external brake choppers, refer to their documentation.
Note: For runtime braking, overvoltage control (parameter 30.30 Overvoltage control)
needs to be disabled for the chopper to operate.
Settings
Parameters 01.11 DC voltage (page 95) and 30.30 Overvoltage control (page 200);
Supply voltage range [V AC] (see 95.01 Supply voltage)
Level [V DC (% of U
DCmax
)] 208…240 380…415 440…480 500 525…600 660…690
Overvoltage fault limit 489/440* 800 878 880 1113 1218
Overvoltage control limit 405 (125) 700 (125) 810 (125) 810 (120) 1013 (125) 1167 (125)
Internal brake chopper at 100%
pulse width
403 (124) 697 (124) 806 (124) 806 (119) 1008 (124) 1159 (124)
Internal brake chopper at 0%
pulse width
375 (116) 648 (116) 749 (116) 780 (116) 936 (116) 1077 (116)
Overvoltage warning limit 373 (115) 644 (115) 745 (115) 776 (115) 932 (115) 1071 (115)
U
DCmax
= DC voltage at upper
bound of supply voltage range
324 (100) 560 (100) 648 (100) 675 (100) 810 (100) 932 (100)
DC voltage at lower bound of
supply voltage range
281 513 594 675 709 891
Undervoltage control and
warning limit
239 (85) 436 (85) 505 (85) 574 (85) 602 (85) 757 (85)
Charging activation/standby
limit
225 (80) 410 (80) 475 (80) 540 (80) 567 (80) 713 (80)
Undervoltage fault limit 168 (60) 308 (60) 356 (60) 405 (60) 425 (60) 535 (60)
*489 V with frames R1…R3, 440 V with frames R4…R8.