SuperSigma2 AM PMS – V1.5.6 17-1-2020 Page 80 (97) ©2019 DMC GmbH Herten Germany
Disabling Performance Table
Performance Table Drive Torque Reduction is totally excluded when the three percentage of reduction settings are set to
100%.
To disable the current rollback due to Performance Table; set the maximum current at speed 1,2 ,3 to 100 % (setting 7.9,
7.10 and 7.11)
M7-15 Low Voltage Cut Back start threshold “LVCBstrt”
M7-16 Low voltage cut back end threshold “LVCBend”
M7-17 Low voltage error threshold “LVerror”
Low voltages occur when the battery is discharged. Or when a large power (current) surge from the battery occurs, for
example, the vehicle is about to drive.
Low voltage cut back
When the voltage is getting low, the controller will limit the power withdrawn from the battery. It will do this by cutting
back the maximum drive power with a percentage as shown in the graph below. Only drive power is cut back. Brake power
is not cut back.
When there is no cut back, the maximum drive power is 100 %.
When the cut back is 100 %, the maximum drive power is at 0 %.
The maximum drive power is the drive power that is available to the user. As long as the user doesn’t use this drive power,
it will not be noticed. But when the user demands more drive power, the drive power is limited to the maximum drive
power available. When this occurs, the Status menu of the controller shows the ‘LV’ limit indication. Also the error F02 is
displayed during low voltage cut back.
The maximum drive power limit will run from 100 % (no cut back) to 0 % (full cut back). This is displayed also in the Status
Menu at “DriveTqLim”.
The low voltage start and end cut back levels are adjustable in the Sigma2 controllers.
Low voltage limit
The low voltage limit is the absolute limit of the controller and the motor. When the voltage is below this level, the
controller will immediate stop driving (and braking) the motor (stops with pulsing) and will report an error F17.
Parameters
The controller will have a set of parameters with which the low voltage cut back can be tuned. The controller itself must
be protected at all times, thus there is a lower limit which cannot be altered. The parameters can only be tuned ‘up’ to
protect the battery and motor of the user.
The parameters are:
• Low voltage cut back start threshold
• Low voltage cut back end threshold
• Low voltage error threshold
The location, unit, range and step size of these adjustments can be found in the “Menu 7 “Limits Setup””.
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