Brake Chopper - ABB ACS580 Firmware Manual

124 Program features
The following table shows the values of selected DC voltage levels. Note that the
absolute voltages vary according to the drive/inverter type and AC supply voltage
range.
See 95.01 Supply voltage.
Overvoltage fault limit
Overvoltage control limit
Internal brake chopper start limit
Internal brake chopper stop limit
Overvoltage warning limit
Undervoltage warning limit
Undervoltage control limit
Charging relay closing limit
Charging relay opening limit
DC voltage at upper bound of supply
voltage range (U )
DCmax
DC voltage at lower bound of supply
voltage range (U )
DCmin
Charging activation/standby limit
Undervoltage fault limit
1)
If parameter 95.01 Supply voltage
set to Enable, the value of parameter
2)
otherwise the lower limit of the range selected with parameter
3)
When standby is activated, drive modulation is stopped, the fan is stopped and the pre-charge circuit is
activated. If the voltage exceeds this level again, the drive has to complete charging before it will
automatically continue operation.
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.
AC supply voltage range [V]
0.85×1.41×par
0.85×1.41×380 = 455
0.75×1.41×par
0.75×1.41×380 = 402
0.75×1.41×par
0.75×1.41×380 = 402
0.65×1.41×par
0.65×1.41×380 = 348
3)
0.65×1.41×par
0.65×1.41×380 = 348
0.45×1.41×par
0.45×1.41×380 = 241
is set to Automatic / not selected
95.03 Estimated AC supply voltage
(page 147),
(page 242), 95.01 Supply voltage
(page 324).
DC voltage level [V]
AC supply voltage range [V]
380...415
840
780
780
760
745
1)
95.03 value
2)
1)
95.03 value
2)
1)
95.03 value
2)
1)
95.03 value 0.65×1.41 ×par
2)
560
513
1)
95.03 value
2)
1)
95.03 value
2)
and 95.02 Adaptive voltage limits
is used,
95.01 Supply voltage
30.30 Overvoltage control
440...480
840
780
780
760
745
0.85×1.41×par 95.03 value
0.85×1.41×440 = 527
0.75×1.41×par 95.03 value
0.75×1.41×440 = 465
0.75×1.41×par 95.03 value
0.75×1.41×440 = 465
95.03 value
0.65×1.41×440 = 403
648
594
0.65×1.41×par 95.03 value
0.65×1.41×440 = 403
0.45×1.41×par 95.03 value
0.45×1.41×440 = 279
is used.
(page 241),
(page 324) and 95.02
1)
2)
1)
2)
1)
2)
1)
2)
1)
2)
1)
2)
is