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6. If the current that you have measured is less than 8A, either use a 24V battery

or use half the resistor value and repeat the measurement. For a good

measurement the current should be between 8A and 20A.

7. The motor resistance is the voltage divided by the current:

Motor resistance =

Measured Voltage at the motor connector

Measured Current

8. Lock the motor shaft in a different position and repeat the procedure from

step 5. Measure the resistance for at least five different positions of the shaft to

reduce the chance that the brushes do not make good contact with the

rotor.

When you have used extra motors as resistance, you do not have to change

the shaft position of those motors as well.

Use the lowest measured resistance and decrease it by 20%

to compensate

for temperature variations and age variations. Multiply the found resistance by

1000 (for milliohm) and program this value into the Load Compensation

parameter with either the HHP or the Wizard.

10. Test the powerchair behaviour with this Load Compensation setting. Drive up

a slope or a sidewalk edge. If Load Compensation has the correct value:

• The chair only slightly slows down when it goes up the slope/edge

• The chair only slightly changes direction when it goes up the slope/edge.

Notes:

1. If the motor is connected to the battery longer than 5 seconds, the

motor becomes warm. If the motor is warm, let the motor cool down

before you do the next measurement.

2. A new motor usually has a higher motor resistance than a motor that

has been used for some time, because the motor brushes that are

inside the motor do not make optimal contact until they are "worn

in". If possible, perform this procedure when the motor has been

used for several hours.

3. Extremely low ambient temperatures can affect the motor

resistance. If the powerchair has been in the garage on a cold day,

the response when it is turned on can be a bit rough. This rough

behaviour stops as soon as the motor heats up. If the powerchair will

be used in extremely low ambient temperatures decrease Load

Compensation accordingly.

4. If the found motor resistance is 100 mΩ or less, perform the same

measurements with a warm motor. Use the lowest value of all

measurements.

Dynamic DX User Manual

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