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Stall Timeout
Stall Timeout can prevent motor burning, particularly in situations when the
joystick gets trapped at full deflection. Some Standards may require a
particular Stall Time.
If set to ‘yes’, driving is disabled after Stall Time in current limit, and Flash
Code 11 is displayed on the System Status LED of the DX Remote. The DX
System has to be powered down and up again to return to the normal driving
mode.
Stall Time
Stall Time defines the stall timeout time if this feature is enabled. Some Safety
Standards may require a particular Stall Time.
I²T
If I²T is set to ‘on’ Motor I²T is enabled. Motor I²T parameters define the
thermal characteristics of the motors used in the wheelchair. The OEM must
provide sample motors or detailed motor specifications to Dynamic Controls.
Dynamic will provide recommended settings to ensure correct motor
protection against overheating.
I²T Threshold
I²T Threshold defines the continuous current rating as a percentage of
maximum current rating, at a theoretical ambient temperature of 0
E
C. Given
that the heating of a motor is proportional to I², values for other temperatures
can be obtained from the maximum motor temperature. In practice, the PM
uses its internal temperature measurement as ambient temperature. This means
that the value for Motor I²T Threshold needs to be greater than its theoretical
value. This is especially so for higher current motors which will tend to heat
the controller more.
Motor Time Scale
This is another I²T parameter and relates to the thermal mass of the motor, i.e.
how quickly it heats up and cools down. A sample motor is needed to evaluate
the correct setting for this parameter.
Summary of Contents for DX Power Module PMB
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