356 Parameters
Enabled without
thermal model
Brake chopper control enabled without resistor overload
protection based on a thermal model. 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.
Before using this setting, ensure that overvoltage control is
switched off (parameter
2
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 of
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 chopper operation only
when the supply is missing from a drive with a regenerative
supply unit.
Off
0.
0
On
1.
1
Source selection (see
). -
Defines the thermal time constant for 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
, and the
brake resistor data sheet.
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 chopper 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
Def
/
FbEq16
Summary of Contents for ACS880-01 Series
Page 1: ...ABB industrial drives Firmware manual ACS880 ESP control program option N5600 ...
Page 4: ......
Page 12: ...12 Table of contents ...
Page 20: ...20 Introduction to the manual ...
Page 22: ...22 Using the control panel ...
Page 28: ...28 Control locations and operating modes ...
Page 146: ...146 Application macros ...
Page 502: ...502 Parameters ...
Page 606: ...606 Fault tracing ...
Page 662: ...662 Control chain diagrams ...