DMC Sigma2N - Page 89

Simga2N Traction Advanced Manual– V1.3 Page 89 (166) ©2021 DMC GmbH Herten Germany
If “Spd1” becomes active with 150Hz speed limit, the motor would run at 150Hz and the AI3 speed
limit is not considered until the AI3% < 150Hz/400Hz*100% = 35%.
• If set to 3, AI3 will be used to set an adjustable speed limit scaled over active speed limit. This means
that the speed limit is relative and referred to the active speed limit. It will be a percentage going from
0 rpm to the active speed limit.
Example:
SpdMaxF = 400 Hz; AI3 = 50%; Speed limit = SpdMaxF*AI3% = 400Hz*50% = 200Hz.
If “Spd1” becomes active (and it is the lowest speed limit) with 150Hz, the speed limit will be calculated
as Spd1*AI3% = 150Hz*50% = 75Hz.
This parameter requires a key cycle off-on to be effective.
To tune properly options 1, 2 and 3 parameters “M1.8-4 Analogue Input 3 minimum voltage level “AI3 min””
and “M1.8-5 Analogue Input 3 maximum voltage level “AI3 max”” have to be adjusted.
WARNING!
It is HIGLY RECOMMENDED to avoid configuring AI3 as an analogue torque limit
(parameter set to 1) on Walkie-type vehicles with speed control mode. This could lead to
serious safety problems and cause operator’s injuries.
DMC declines any responsibility for incorrect setup of this parameter.
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.
M2-12 Use speed limits instead of torque limits “TmpLVSpL”
If this parameter is set to 0 (use torque limits), the controller will:
• limit the drive torque in case the voltage is getting low (refer to “M5.3-1 Low voltage cutback start
level “LVCBstrt”” and “M5.3-2 Low voltage cutback end level “LVCBend””), in case the motor
temperature is getting high (refer to “M5.2-2 Motor temperature cutback start level “TempStrt””) and
in case the controller temperature is getting high (temperature higher than 85°C);
• limit the brake torque in case the controller is in torque mode (“M2-1 Control Mode “Spd/Torq”” set
higher than 0) and the controller temperature is getting very high (temperature higher than 90°C);
• limit the motor speed in case the controller temperature is getting very high (temperature higher than
90°C);
If this parameter is set to 1 (use speed limits), the controller will convert the “Low voltage”, “Motor
temperature high” and “Controller temperature high” (temperature higher than 85°C) limits from torque to
speed limits. No drive or brake torque will be cut because of one of the mentioned limitations active. Mind
drive and brake torque will still be cut in case of other limitations (see “Menu 5 “Limits Setup”” for details about
other possible limitations) are active.
M2-13 Variable/Constant ramp time “CnRmpTm”
This parameter is active In speed mode only and sets whether the controller will adopt variable or constant
ramp times (and therefore constant or variable slopes, respectively).
• If set to 0 (variable ramp times), all the set ramp times will be referred to the “Maximum motor
frequency” in “Menu 3 “Autotuning””.
• If set to 1 (constant ramp times), the ramp times will be referred to the active speed limit.
Example: the “Maximum motor frequency” in “Menu 3 “Autotuning”” is set to 200Hz, “M2-13
Variable/Constant ramp time “CnRmpTm”” is set to 0, “M1.1-1 Accelerator ramp time “Acc Ramp”” is set to 2
seconds and “M5.1-2 Maximum speed forward “SpdMaxF”” is set to 100Hz. If the accelerator is fully pressed
(100% demand), it will take 1 second for the motor to reach the desired speed.