SuperSigma2 QRM PMS – V01.02.02 17-1-2020 Page 42 (58) ©2019 DMC GmbH Herten Germany
9.17 Thermal Motor Management & Performance Table
The Performance Table sets a maximum current for a specified speed as shown in the table below:
Between PTSpd1 and PTSpd2
Scale the set maximum current proportionally with speed between the speed points
PTSpd1 and PTSpd2.
Between PTSpd2 and PTSpd3
Scale the set maximum current proportionally with speed between the speed points
PTSpd2 and PTSpd3.
The Performance Table collaborate with the other current roll back functions. The current roll back on controller
temperature, current roll back on motor temperature and the I2t function.
The I2t function have its settings in percentages, the same as the current roll back on controller and motor temperature.
The function that has the highest roll back percentage, will be applied to the applicable maximum current, and will
result in the effective maximum current as shown in the picture below (here the roll back is 50%).
Speed [rpm]
Current [Arms]
Applicable Maximum current
set by Performance Table
Effective maximum current
For normal operation, the maximum
current at boost speed is usually set the
same as the maximum current from the
adjustments menu.
This will then give a straight line from
zero speed towards boost speed yielding
maximum current at low speeds.
During operation, the controller will show
“PT” at row 9 in the status menu.
9.17.1 Current roll back on motor temperature
The maximum current value is rolled back as soon as the
motor temperature is above it’s starting point adjustment
(parameter 2 in the limits setup menu). It is cut back
proportionally between the starting point and 30 °C above the
starting point as shown in the graph below.
9.17.2 Option to disable current roll back functions
To disable the current rollback features:
• current roll back on motor temperature; by setting the motor temperature start adjustment at 151 °C,
• I2t function; by setting the I2tTime adjustment to 0.
• Performance Table; by setting the maximum current at boost speed adjustment to 0 A.
Current
[A]
Motor temperature [°C]
Motor Temperature
Fold back start setting
30 °C
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