276 Parameters
43
43 Brake chopper
Settings for the internal brake chopper.
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
temperature the resistor would reach if the maximum
continuous braking power (43.09 Brake resistor Pmax
cont) is applied to the resistor for 100% rated time. The
thermal time constant (43.08 Brake resistor thermal tc)
defines the rated time to achieve 63% temperature. 100%
would be reached when 100% time has elapsed.
This parameter is read-only.
-
0.0…120.0% Estimated brake resistor temperature. 1 = 1%
43.06 Brake chopper
enable
Enables brake chopper control.
Note: Before enabling brake chopper control, ensure that
• a brake resistor is connected, and
• 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 resistor overload
protection.
Note: Before using this setting, ensure that overvoltage
control is switched off (parameter 30.30 Overvoltage
control).
1
Enabled without
thermal model
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.
Before using this setting, ensure that overvoltage control is
switched off (parameter 30.30 Overvoltage control)
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
No. Name/Value Description Def/
FbEq16
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