ABB ACS880 Firmware Manual page 357

No. Name/Value
Enabled with
thermal model
Enabled without
thermal model
Overvoltage peak
protection
43.07 Brake chopper run
enable
Off
On
Other [bit]
43.08 Brake resistor
thermal tc
0 ... 10000 s
43.09 Brake resistor Pmax
cont
0.00 ...
10000.00 kW
43.10 Brake resistance
0.0...1000.0 ohm
Description
Brake chopper control enabled with resistor overload
protection.
Note: Before using this setting, ensure that overvoltage
control is switched off (parameter
control).
Brake chopper control enabled without resistor overload
protection. This setting can be used, for example, if the
resistor is equipped with a thermal circuit breaker that is
wired to stop the drive if the resistor overheats.
Note: Before using this setting, ensure that overvoltage
control is switched off (parameter
control).
Brake chopper control is enabled in an overvoltage
condition. This setting applies in the following situations,
where:
• the braking chopper is not needed for runtime operation,
that is to dissipate the inertial energy of the motor
• the motor is able to store a considerable amount of
magnetic energy in its windings
• the motor might, deliberately or inadvertently, be stopped
by coasting.
In such a situation, the motor potentially discharges 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.
Selects the source for quick brake chopper on/off control.
0 = Brake chopper IGBT pulses are cut off
1 = Normal brake chopper IGBT modulation.
This parameter can be used to program the chopper control
to function only when the supply is missing from a drive with
a regenerative supply unit.
0.
1.
Source selection (see Terms and abbreviations
152).
Defines the thermal time constant of the brake resistor for
overload protection.
Brake resistor thermal time constant.
Defines the maximum continuous braking power of the
resistor (in kW) which will raise the resistor temperature to
the maximum allowed value. The value is used in the
overload protection.
Maximum continuous braking power.
Defines the resistance value of the brake resistor. The value
is used for brake chopper protection.
Brake resistor resistance value.
Parameters 357
30.30 Overvoltage
30.30 Overvoltage
on page
Def/FbEq16
1
2
3
On
0
1
-
0 s
1 = 1 s
0.00 kW
1 = 1 kW
0.0 ohm
1 = 1 ohm