Def / Type
FbEq 16b / 32b
Description
Name / Range /
Selection
No.
3
Brake chopper starts to conduct at 100% pulse width
whenever
•
The DC voltage exceeds the overvoltage fault limit
(a hysteresis applies), and
•
The drive is not modulating (for example, during
a coast stop).
The thermal model-based resistor overload protection
is not active.
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.
Overvoltage peak
protection
On / uint32
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.
Brake chopper run
enable
43.7
0
0.
Off
1
1.
On
See
Terms and abbreviations (page 130)
Other [bit]
0 s / real32
Defines the thermal time constant for the brake resistor
thermal model.
Brake resistor
thermal tc
43.8
1 = 1 s / 1 = 1 s
Brake resistor thermal time constant, ie. the rated time
to achieve 63% temperature.
0...10000 s
0.00 kW / real32
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.
Brake resistor max
cont power
43.9
1 = 1 kW / 1 = 1 kW
Maximum continuous load of the brake resistor.
0.00 ... 10000.00 kW
360 Parameters
Содержание ACS880 N5700 Series
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