Parameter descriptions
7.10.5 Motor chopper
507 Trigger Threshold
The field-orientated control systems for asynchronous motors (configuration 410 FOC) contain the
function for adapted implementation of the generator energy into heat in the connected three-phase
machine. This enables the realization of dynamic speed changes at minimum system costs. The torque
and speed behavior of the drive system is not influenced by the parameterized braking behavior. The
parameter
Trigger Threshold 507 of the DC link voltage defines the switch-on threshold of the motor
chopper function.
507 Trigger Threshold
Set parameter
Trigger Threshold 507 such that it is between the maximum DC link voltage which the
mains can generate and the maximum admissible DC link voltage of the frequency inverter.
If the parameter
Trigger Threshold 507 is set larger than the maximum admissible DC link voltage,
the motor chopper cannot become active, the motor chopper is switched off.
If the set
Trigger Threshold 507 is smaller than the maximum DC link voltage the mains can gener-
ate, error message F0706 (chapter 13.1.1 "Error messages") is displayed when the frequency inverter
is switched on.
The motor chopper function only works if activated via voltage Controller Operation
Mode
670. See chapter 7.9.2 “Voltage controller”.
For synchronous motors (Configuration 30 = 610), the motor chopper function is
deactivated to prevent damages to the motor. The other functions of the voltage con-
troller are not affected by this.
Please note that by default the Motor chopper Trigger Threshold 507 and the Trigger
Threshold
506
are set up with different values. Check, that the two thresholds are set
up fittingly for your application.
Please check chapter 7.10.4 “Brake chopper and brake resist”.
244
Operating Instructions
Agile
06/2013 Special functions
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