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Program features 77
Settings
Parameters
(page
), and
(page
).
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.
Some ACS880 drives have an internal brake chopper as standard, some have a
brake chopper available as an internal or external option. See the appropriate
hardware manual or sales catalog.
The internal brake choppers of ACS880 drives start conducting when the DC link
voltage reaches 1.156 ×
U
DCmax
. 100% pulse width is reached at approximately 1.2 ×
U
DCmax
, depending on supply voltage range – see table under
above. (
U
DCmax
is the DC voltage corresponding to the maximum of the AC
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.
Supply voltage range [V AC]
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.
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...