312 Parameters
43
43 Brake chopper
Settings for the internal brake chopper.
This parameter group is applicable only for frames R0...R3
43.01 Braking resistor
temperature
Displays the estimated temperature of the brake resistor, or
how close the brake resistor is to being too hot.
The value is given in percent where 100% is the eventual
temperature the resistor would reach when loaded long
enough with its rated maximum load capacity (43.09 Brake
resistor Pmax cont).
The temperature calculation is based on the values of
parameters 43.08, 43.09 and 43.10, and on the assumption
that the resistor is installed as instructed by the manufacturer
(ie it cools down as expected).
This parameter is read-only.
0.0
0.0…120.0% Estimated brake resistor temperature. 1 = 1%
43.06 Brake chopper
enable
Enables brake chopper control and selects the brake resistor
overload protection method (calculation or measurement).
Note: Before enabling brake chopper control, ensure that
• a brake resistor is connected
• overvoltage control is switched off (parameter 30.30
Overvoltage control)
• the supply voltage range (parameter 95.01 Supply voltage)
has been selected correctly.
Disabled
Disabled Brake chopper control disabled. 0
Enabled with
thermal model
Brake chopper control enabled with brake resistor protection
based on the thermal model. If you select this, you must also
specify the values needed by the model, ie. parameters
43.08… 43.12. See the resistor data sheet.
1
Enabled without
thermal model
Brake chopper control enabled without resistor overload
protection based on the thermal model. This setting can be
used, for example, if the resistor is equipped with a thermal
switch that is wired to open the main contactor of the drive if
the resistor overheats.
For more information, see chapter Resistor braking in the
Hardware manual.
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 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
No. Name/Value Description Def/FbEq16
To Next Page
Loading...
Need help?
General
