M
T
7.4
Programming and testing a DX chair for stability
The best results when programming a DX chair will be obtained when the person who
programs the chair physically tests the settings on the chair in question, and adjusts
the settings based on the observed physical chair behaviour. The following procedure
can help to create a familiarity with how a chair physically reacts to different
parameter values, and if followed from beginning to end it makes sure that later
parameter adjustments will not conflict with earlier made adjustments.
Note:
The following procedure should be done on a finalised chair, which
means that all components and accessories of the chair are
mounted and installed correctly, so that the chair geometry or
weight will not be changed after the testing.
Warning
The following procedure tests the stability of the chair, which means
that it seeks the point where the chair becomes unstable. This is
potentially dangerous. Take
extreme
care not to make the chair
actually lose control and
perform these tests in a wide open space.
Careless testing or testing in an unsafe location could cause severe
injury to the operator/ tester or bystanders, or damage to the vehicle
or surrounding property.
It is the responsibility of the operator/ tester to assess his/her own
safety and the safety of others, and to take appropriate precautions
and safety measures before performing these tests.
Safety measures may include but are not limited to:
•
Making sure that the chair can not tip over during an emergency
stop on a slope, for example by fitting a foot plate
•
Wearing personal safety protection (helmet, knee pads, etc.)
•
Not wearing a seat belt if there is a chance that the chair may roll
over on top of the tester.
1.
Preparation
119
a.
Determine the motor resistance and set
Load Compensation
(4.3.2.3) to the
correct value.
Input Demand Scaler
b.
Set the
(4.3.2.13) to the desired value.
Power Module parameters such as Load Compensation and the Input Demand
Scaler affect the performance of all other speed and acceleration parameters
and as such it is important to set these parameters correctly before programming
anything else. If these parameters are changed after the chair has been set up,
the complete programming and testing procedure must be repeated.
c.
Enable
Halve Turning Gain
(4.3.4.8). This makes steering more precise. Enabling
this parameter is also required to enable the use of all UCM Rev. C
parameters, including the chair stability parameters.
