Simga2N Traction Advanced Manual– V1.3 Page 44 (166) ©2021 DMC GmbH Herten Germany
In case of forward direction re-selection (with actual speed in forward direction) the Drive Forward
condition is allowed regardless of the accelerator position.
The above examples apply also for motor driving reverse with reverse direction applied.
FLYING RESTART
Imagine the controller is not giving power to the motor and the motor is already spinning (vehicle rolling
downhill in neutral). If the controller is switched on and one of the direction switches (FW or RW) is
activated from the neutral condition, one of the following situations will happen:
i. If the selected direction switch is consistent with the actual motor direction (for example FW switch
selected and motor spinning forward), it is possible to give the Drive Condition in the proper
direction.
Only if speed is above 80% of ”Maximum motor frequency” (adjustable in “Menu 3 “Autotuning””)
F30 S001 happens.
ii. If the selected direction switch is opposite to the actual motor direction and the speed is above
“MdDbrSp”, the controller stays in neutral condition and no direction request can be activated.
iii. If the selected direction switch is opposite to the actual motor direction and the speed is below
“MdDbrSp”, the selected direction switch can be activated regardless of the accelerator status.
Despite this, recall that when the vehicle is powered on the accelerator status should be pressed
more than 50%, otherwise F13 S001 happens.
ROLLING BACK REVERSE WITH FORWARD DRIVE SELECTED (or rolling forward with reverse drive selected)
The vehicle is on an uphill slope, the driver reduce “accel pot” but the forward direction switch is still
selected. The vehicle will slow down for the effect of the slope and start to roll back into reverse direction.
While rolling back, even if the speed (absolute value) goes above the “Max. Direction change speed”, the
forward direction stays selected and vehicle can drive forward to a further pressing on accelerator pedal
(of course if Forward Direction physical input it is kept selected).
If during roll back the reverse direction is selected the DIRECTION CHANGE OPERATION and FLYING
RESTART operation conditions are considered.
ROLLING FORWARD (or backwards) WITHOUT THE CONTROLLER GIVING POWER TO THE MOTOR
If the vehicle is rolling forward with the controller not giving power to the motor (thus controller in Neutral
Status) the FLYING RESTART procedure has to be considered.
FOOTBRAKE POT
The “Footbrake Pot”, when applied, always brakes the vehicle and has precedence over the other
commands.
SIGNALLING TO THE USER THE NOT CORRECT SEQUENCE
If any RV switch is activated while driving forward and the speed is above the “Max. Direction change
speed”, F12 S011 occurs. The same happens for complimentary situation (FW switch activated while
reverse driving with speed above threshold).
In general, every time an input switch is selected but is blocked by the “Inhibit the change of direction”
algorithm F12 S011 occur.
If “Inhibit the change of direction” function is activated by a selection of MxDbrkSp lower than
100%, the “Accelerator” must be tuned properly. In fact the drive direction change is allowed
when speed is below the threshold and if accelerator is fully released (its value is 0%). To avoid
strange behavior check if with accelerator fully released the signal is 0% by reading the line 9
and 10 of ”Test menu” by means of calibrator. If not, the Adjustment 51 “AccMin” has to be
increased.
For example if with accelerator fully released the volt value at line 10 of test menu “Accel Pot
[V]” is 0,3V set 51 “AccMin” to 0,5V for a proper behavior of the function Inhibit the change
of direction”.
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