TROUBLESHOOTING | SECTION 2 |
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This Section Includes the Following:
Field Load Test
Motor Testing
Motor Brush Inspection
FIELD LOAD TEST (FIGURE 1)
NOTE: The following test can also be performed through the controller of the wheelchair along with a remote programmer. Refer to the ELECTRONICS MANUAL supplied with each wheel- chair.
Old batteries lose their ability to store and release power, due to increased internal resistance. This means that as you try to take power from the battery, some of that power is used up in the process of passing through the battery, resulting in less voltage at the posts. The more power drawn, the lower the voltage available. When this lost voltage drops the output 1.0 volts under load (2.0 for a pair), replace the batteries.
Testing under load is the only way to spot this problem. While special battery load testing equipment is available, it is costly and difficult to transport.
Use a digital voltmeter to check battery charge level at the charger connector. It is located on the base of the wheelchair frame.
TROUBLESHOOTING
NOTE: READ the instructions CAREFULLY before using the digital voltmeter.
NOTE: Invacare recommends that ONLY qualified service personnel perform this test.
1.Ensure that power is OFF.
2.Make sure battery is fully charged. An extremely discharged battery will exhibit the same symptoms as a bad one.
Battery Charger | |
Connector |
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Digital Voltmeter
FIGURE 1 - FIELD LOAD TEST
3.Remove the footrests from the wheelchair and place the CASTERS of the wheelchair against a wall, workbench or other stationary object.
4.Place the voltmeter leads into the charger plug on the wheelchair. Most digital voltmeters are not affected by polarity, however, analog meters (meters with swinging needles) can be and should be used carefully. A good meter reading should be 25.5 to 26 VDC.
5.Have two (2) individuals (one [1] on each arm) apply as much downward pressure as possible on the arms of the wheelchair.
6.Turn the wheelchair ON and push the joystick forward, trying to drive the wheelchair through the stationary object. This puts a heavy load on the batteries as they try to push through the stationary object. Read the meter while the motors are straining to determine the voltage under load.
NOTE: If the voltage drops to less than 23.5 volts from a pair of fully charged batteries while under load, they should be replaced regardless of the unloaded voltages.
Part No. 1104849 | 17 | 3G Storm Series® Wheelchairs |
