DMC Sigma2N - Menu 5.9 Speed Guard Function

Simga2N Traction Advanced Manual– V1.3 Page 115 (166) ©2021 DMC GmbH Herten Germany
Menu 5.9 “Speed guard function”
Cal.
Ref.
Parameter name “Calibrator text”
Range
Step
size
Default
Index
Sub-
index
1
Speed control guard tracking error threshold
“SpdGrdTH”
0% - 40%
1%
0%
0x260C
0x1
2
Speed control guard timer “SpdGrdTm”
0.1s – 12.0s
0.1s
0.1s
0x260C
0x2
M5.9-1 Speed control guard tracking error threshold “SpdGrdTH”
M5.9-2 Speed control guard timer “SpdGrdTm”
Those parameters define the “Speed guard function” behaviour.
The “Speed guard” function is enabled when parameter “M5.9-1 Speed control guard tracking error threshold
“SpdGrdTH”” is set greater than 0.
This function provided an high safety level for vehicles controlled in speed mode (“M2-1 Control Mode
“Spd/Torq”” set to 0), since it tracks the error between the demanded speed and the actual speed of the motor.
If this error is above the set threshold for a time grated than “M5.9-2 Speed control guard timer “SpdGrdTm””,
the motor stops and the EMbrake closes immediately.
Therefore if, for example, the vehicle is trying to climb a slope but is has not enough torque to succeed, the
speed error will be very large and the function will recognise the “stall” condition, closing the EMbrake and
avoiding the vehicle to roll back.