ABB ACS380 Series - Parameters and Diagnostics; Brake Chopper

86 Program features
The following table shows the values of the selected DC voltage levels in volts. Note
that the absolute voltages vary according to drive/inverter type and AC supply voltage
range.
 Parameters and diagnostics
Parameters: 01.11 DC voltage, 30.30 Overvoltage control, 30.31 Undervoltage
control, 95.01 Supply voltage and 95.02 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 during the braking of a high inertia
load, the chopper connects the DC circuit to an external brake resistor. The heat
dissipation in the resistor consumes the extra energy of the DC circuit and the DC
voltage decreases to the normal level. The chopper operates on the pulse width
modulation principle.
DC voltage level [V]
See 95.01 Supply voltage.
Supply voltage range [V]
380…415
Supply voltage range [V]
440…480
Overvoltage fault limit 840 840
Overvoltage control limit 780 780
Internal brake chopper start limit 780 780
Internal brake chopper stop limit 760 760
Overvoltage warning limit 745 745
Undervoltage warning limit 0.85×1.41×par 95.03 value
1)
0.85×1.41×par 95.03 value
1)
0.85×1.41×380 = 455
2)
0.85×1.41×440 = 527
2)
Undervoltage control limit 0.75×1.41×par 95.03 value
1)
0.75×1.41×par 95.03 value
1)
0.75×1.41×380 = 402
2)
0.75×1.41×440 = 465
2)
Charging relay closing limit 0.75×1.41×par 95.03 value
1)
0.75×1.41×par 95.03 value
1)
0.75×1.41×380 = 402
2)
0.75×1.41×440 = 465
2)
Charging relay opening limit 0.65×1.41×par 95.03 value
1)
0.65×1.41 ×par 95.03 value
1)
0.65×1.41×380 = 348
2)
0.65×1.41×440 = 403
2)
DC voltage at upper bound of supply
voltage range (U
DCmax
)
560 648
DC voltage at lower bound of supply
voltage range (U
DCmin
)
513 594
Charging activation/standby limit 0.65×1.41×par 95.03 value
1)
0.65×1.41×par 95.03 value
1)
0.65×1.41×380 = 348
2)
0.65×1.41×440 = 403
2)
Undervoltage fault limit 0.45×1.41×par 95.03 value
1)
0.45×1.41×par 95.03 value
1)
0.45×1.41×380 = 241
2)
0.45×1.41×440 = 279
2)
1)
If parameter 95.01 Supply voltage is set to Automatic / not selected and 95.02 Adaptive voltage limits is
set to Enable, the value of parameter 95.03 Estimated AC supply voltage is used,
2)
otherwise the lower limit of the range selected with parameter 95.01 Supply voltage is used.