
Parameters 239
Overvoltage peak
protection
Brake chopper control enabled in an overvoltage
condition.
This setting is intended for situations where
• the braking chopper is not needed for runtime
operation, ie. to dissipate the inertial energy of the
motor,
• the motor is able to store a considerable amount
magnetic energy in its windings, and
• the motor might, deliberately or inadvertently, be
stopped by coasting.
In such a situation, the motor would potentially
discharge enough magnetic energy towards the drive
to cause damage. To protect the drive, the brake
chopper can be used with a small resistor
dimensioned merely to handle the magnetic energy
(not the inertial energy) of the motor. With this
setting, the brake chopper is activated only whenever
the DC voltage exceeds the overvoltage limit. During
normal use, the brake chopper is not operating.
3
Selects the source for quick brake chopper on/off
control.
0 = Brake chopper IGBT pulses are cut off
1 = Normal brake chopper IGBT modulation allowed.
This parameter can be used to enable the chopper
operation only when the supply is missing from a
drive with a regenerative supply unit.
On
Off
0
0
On
1
1
-
Defines the thermal time constant of the brake
resistor thermal model.
0 s
0…10000 s
Brake resistor thermal time constant, ie, the rated
time to achieve 63% temperature.
1 = 1 s
Defines the maximum continuous load of the brake
resistor which will eventually raise the resistor
temperature to the maximum allowed value (=
continuous heat dissipation capacity of the resistor in
kW) but not above it. The value is used in the resistor
overload protection based on the thermal model. See
parameter
.
See the data sheet of the brake resistor used.
0.00 kW
0.00… 10000.00 kW
Maximum continuous load of the brake resistor.
1 = 1 kW
Defines the resistance value of the brake resistor. The
value is used for the brake resistor protection based
on the thermal model. See parameter
0.0 ohm
0.0…1000.0 ohm
Brake resistor resistance value.
1 = 1 ohm
No.
Name/Value
Description
Default
FbEq 16
Summary of Contents for ACS280
Page 1: ... ABB MACHINERY DRIVES ACS280 coldplate drives Firmware manual ...
Page 4: ......
Page 10: ...10 ...
Page 16: ...16 Control panel ...
Page 20: ...20 Start up ID run and use ...
Page 24: ...24 Default control connection ...
Page 88: ...88 Program features ...
Page 298: ...298 Parameters ...