DMC Sigma2N - Page 98

Simga2N Traction Advanced Manual– V1.3 Page 98 (166) ©2021 DMC GmbH Herten Germany
Increasing “M5.2-3 Motor temperature cutback span “TempSpan”” allows for a smoother cut of motor
current/speed, at the cost of motor temperature overshooting more above “M5.2-2 Motor temperature
cutback start level “TempStrt””. A small value of “M5.2-3 Motor temperature cutback span “TempSpan””
assures an immediate cut/reduction of motor temperature, but with a more aggressive effect on motor
current/speed.
As maximum current, the setting “Maximum motor current” (adjustable in “Menu 3 “Autotuning””) is
considered.
As maximum speed, the setting “Maximum motor frequency” (adjustable in “Menu 3 “Autotuning””) is
considered.
Example:
“M2-11 Digital output PWM chopping frequency “DO freq”
This parameter can be used to change the chopping frequency used to lower the voltage applied at the digital
outputs.
Use speed limits instead of torque limits “TmpLVSpL”” is set to 0 (limit torque).
If the value of “M5.2-2 Motor temperature cutback start level “TempStrt”” is 150 °C, the value of “M5.2-3
Motor temperature cutback span “TempSpan”” is 10°C and the value of “Maximum motor current” (adjustable
in “Menu 3 “Autotuning””) is 150A, the current will be limited to 75A when the motor temperature is 155 °C
and to 0 when the motor temperature is 160 °C.
The current cut back is applied only to drive current/torque, thus it does not affect any breaking operation.
Current (or speed) cut back based on motor temperature can be disabled by setting “M5.2-2 Motor
temperature cutback start level “TempStrt”” at 151 °C.
High temperature error
Parameter “M5.2-4 Motor temperature high error level “TempErr”” defines a threshold above which the motor
temperature is considered unacceptable and therefore an hard error is provoked. This parameter can be used,
for example, in case a large value for “M5.2-3 Motor temperature cutback span “TempSpan”” is set (in order
to have a smoother cut of motor current/speed), but the resulting cutback end level is an unacceptable
temperature for the motor.
M5.2-5 Motor temperature offset “T offset”
This parameter is used to set an offset for the motor temperature measured by the sensor connected. It is
useful to compensate sensor accuracy tolerance. It can be both positive and negative.