SuperSigma2 AM PMS
–
V1.5.6 17-1-2020
Page 26 (97)
©2019 DMC GmbH Herten Germany
M1-10T
Direction Brake torque “DBrake”
This parameter is active only in torque mode.
This sets the strength of the braking upon a direction change, i.e. form forward to reverse.
The setting is a percentage of maximum motor torque. The maximum motor torque is defined by
.
M1-11T
Direction brake ramp time
“DBrkRamp”
In Torque Control mode this sets the time taken to ramp from no braking torque to full braking torque, upon a change of
direction. Increasing the value gives a smoother but longer transition from drive to direction braking.
In Speed Control mode this sets the time taken to ramp down the speed in the current direction to zero, upon a change
of direction. After passing through zero speed, the normal acceleration time as described in
is applied. Increasing the value gives a smoother but longer transition to zero speed.
Important for speed control:
When speed control selected (“
= 0) using a very low value of time
will bring a very harsh direction braking.
M1-12T
Max. d
irection change speed “MxDbrkSp”
This parameter inhibits the change of direction if the speed is above a tunable threshold (between 0% and 100% of the
max speed).
The default value for MxDbrkSp is 100%, which means this function is disabled and it is always allowed to change the
direction while vehicle is moving.
If the value is set lower than 100% the details of the different situations will be described as follow:
DIRECTION CHANGE OPERATION
(described for motor driving forward with forward direction applied)
I.
If
the motor speed is below “MxDbrkSp” and r
everse direction is selected, the direction change operation is
allowed regardless of the accelerator position;
II.
If the motor speed is above “MxDbrSp” and
reverse direction is selected, the direction change operation is always
denied, the motor is stopped
according to neutral brake settings (“
Neutral brake ramp time “NBrkRamp””,
Neutral Brake torque “NBrake””)
and the controller signals a fault;
III.
If the motor speed is above “MdDbrSp” and
neutral is selected, the motor slows down according to neutral brake
settings (“
Neutral brake ramp time “NBrkRamp””, “
Neutral Brake torque “NBrake””)
. When the
speed drops below “MxDbrSp”
it is possible to select the reverse direction only if the accelerator position is 0%
(pedal fully released).
IV.
If the motor speed is above “MdDbrSp” and the accelerator is released (forward direction still selected),
the
motor slows down according to “
Neutral brake ramp time “NBrkRamp””. When the speed drops below
“MxDbrSp” it is possible to select the reverse direction regardless of the accelerator position.
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 pulsing 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
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.
