Brake Chopper - ABB ACS850 Manual

The intermediate DC circuit is charged over an internal resistor which is bypassed
when the capacitors are considered charged and the voltage has stabilized.
Settings
Parameter group 47 Voltage ctrl

Brake chopper

The built-in brake chopper of the drive can be used to handle the energy generated
by a decelerating motor.
When the brake chopper is enabled and a resistor connected, the chopper will start
conducting when the DC link voltage of the drive reaches U
maximum braking power is achieved at U
U = 1.35 × 1.25 ×
DC_BR
Settings
Parameter group 48 Brake chopper
Overvoltage fault level (U
Overvoltage control level (1.25 × U
01.07 Dc-voltage
Undervoltage control level (0.8 × U
Undervoltage fault level (U
U = 1.35 × 01.19 Used supply volt
DC
U , high = 1.25 × U
DC DC
U , low = 0.8 × U
DC DC
*Drives with 230 V supply voltage (ACS850-04-xxxx-2): The overvoltage fault
level is set to 500 V.
(page 231).
01.19 Used supply
(page 231).
high + 70 V; 880 V max.)*
DC,
; 810 V max.)
DC
; 400 V min.)
DC
low - 50 V; 350 V min.)
DC,
DC_BR
+ 30 V.
DC_BR
volt.
Program features 79
- 30 V. The