Dynamic DX User Manual

MT
5.3 Programmable parameters
5.3.1 Speed and acceleration principles
M
Maximum
Motor
Volts
Accel/Decel
Speed Demand
0 – 100 %
Joystick
deflection
0-100 %
Power
Module
UCM
Speed Limiting Options
Input Demand Scaler Max Demand Spd Limit Speed Pot Speed @ Max
5.3.1.1 Speed Demand
When the user deflects the joystick or presses a drive control switch, the UCM (see
section
5.1.1) converts the Joystick Deflection value into a Speed Demand value. The
UCM then sends this Speed Demand value to the Power Module. The Speed Demand
value is given as a percentage of the mechanical top speed of the powerchair.
The actual achievable mechanical top speed (in km/h) of any particular powerchair
depends on factors like
• the wheel size
• the motors
• the gear used
• the available battery voltage
(batteries that are almost empty have a lower maximum output voltage).
The mechanically achievable top speed varies greatly between powerchair models.
For this reason the Speed Demand value is given as a
percentage of that
mechanical top speed.
For example:
• A chair that has a mechanical top speed of 12 km/h will drive at
approximately 6 km/h when the Speed Demand is 50%*.
• A chair that has a mechanical top speed of 8 km/h will drive at approximately
6 km/h when the Speed Demand is 75%*.
*When the Input Demand Scaler and the Maximum Motor Volts parameters are both set at their maximum
value. See next section for more details.
53

Dynamic DX Specifications

General

Brand	Dynamic
Model	DX
Category	Network Router
Language	English