Section 3
Understanding VSI Controller Diagnostics Codes
3.1 One Bar - Low Battery Voltage
This code could indicate discharged batteries, failed batteries, or poor battery connections. Begin by recharging the bat- teries and then refer to Section 1 to check batteries and connections.
3.2 Two Bars - Left Motor Disconnected
The left hand motor has a bad connection. Check the connections to the left hand motor.
Test Left Motor Open |
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Check that the batteries are fully charged and in good con- |
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dition; and check all cables and connections. Check the |
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connections to the left motor, look for a loose or damaged |
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connector. Remove the |
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resistance across pin 3 and pin 4 as shown in (figure |
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A3.2.1). If the meter reads between 0 to 1.5 ohms, then | A3.2.1 |
replace the controller. |
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If the meter reads between 0 to 1.5 ohms, then replace the controller.
Otherwise, check the brushes on the left motor. Ensure that they are not excessively worn, (replace as required) as shown in (figure A3.2.2).
A3.2.2
Use the meter to check the resistance across the two bot- tom contacts (thicker wires) on the
A3.2.3
If the meter reads between 0 to 1.5 ohms, then replace the main harness.
If none of the above corrects the problem, replace the left motor.
SUNRISE MEDICAL | ASPIRE SERVICE MANUAL | 2003 | PAGE 5 |