TROUBLESHOOTING

PROCEDURE 2

 

 

 

This Procedure Includes the Following:

Field Load Test

Using Hydrometer To Check Battery Cells (Lead Acid)

Motor Testing

Motor Brush Inspection Electro-Mechanical Parking Brake Testing

FIELD LOAD TEST (FIGURE 1)

NOTE: The following test can also be performed through the controller of the wheelchair along with a remote pro- grammer. Refer to the individual CONTROLLER MANUAL supplied with each wheelchair.

Oldbatterieslosetheirabilitytostoreandreleasepower,due to increased internal resistance. This means that as you try totakepowerfromthebattery,someofthatpowerisusedup intheprocessofpassingthroughthebattery,resultinginless voltage at the posts. The more power drawn, the lower the voltageavailable.Whenthislostvoltagedropstheoutput1.0 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.

Useadigitalvoltmetertocheckbatterychargelevelatthecharger connector. It is located on the base of the wheelchair frame.

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 swing- ing 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 for- ward, trying to drive the wheelchair through the sta- tionary 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.

Battery Charger

(-)

Connector

 

(+)

Digital Voltmeter

FIGURE 1 - FIELD LOAD TEST

T R O U B L E S H O O T I N G

NOTE: READ the instructions CAREFULLY before us- ing the digital voltmeter.

NOTE: Invacare recommends that ONLY qualified ser- vice personnel perform this test.

1.Ensure that power is OFF.

2.Make sure battery is fully charged. An extremely dis- charged battery will exhibit the same symptoms as a bad one.

3.Remove the footrests from the wheelchair and per- form one (1) of the following:

A.RWD MODELS - place the CASTERS of the wheelchair against a wall, workbench or other stationary object.

B.MWD MODELS - place the STABILIZER wheels of the wheelchair against a wall, work- bench or other stationary object.

C.FWD MODELS -place the DRIVE wheels of the wheelchair against a wall, workbench or other stationary object.

USING HYDROMETER TO CHECK BATTERY CELLS (LEAD ACID) (FIGURE 2)

NOTE: Perform this procedure when a digital voltmeter is not available.

WARNING

NEVER smoke or strike a match near the batteries. If the caps of the battery cells are removed, NEVER look directly into them when charging the battery.

The use of rubber gloves and chemical goggles or face shields is recommended when working with batteries.

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Invacare RWD Field Load Test Figure, Using Hydrometer to Check Battery Cells Lead Acid Figure, Troubleshooting Procedure
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Arrow FWD, RWD, MWD specifications

Invacare is a renowned name in the field of mobility technologies, consistently innovating and enhancing the mobility devices market. Among its outstanding offerings are the Invacare MWD (Mid Wheel Drive), RWD (Rear Wheel Drive), and Arrow FWD (Front Wheel Drive) wheelchairs. Each of these models serves unique user needs, featuring distinct designs and functionalities.

The Invacare MWD is engineered for exceptional maneuverability. Its mid-wheel drive technology provides a centralized drive wheel, allowing for tight turns and easy navigation in confined spaces. This makes the MWD particularly suitable for indoor use, where space can be limited. The MWD also features advanced suspension systems, offering superior shock absorption. This results in a smoother ride over various terrains, enhancing user comfort and stability.

On the other hand, the Invacare RWD focuses on robust outdoor performance. With its rear-wheel drive configuration, this model has excellent traction and provides powerful acceleration. The RWD is designed for versatility, equipped with larger wheels that can handle uneven terrain while providing a stable ride. Its durable construction ensures enhanced longevity, making it an ideal choice for users who lead an active lifestyle and require reliable mobility solutions on rugged ground.

The Arrow FWD wheelchair brings another dimension with its front-wheel drive system. This design allows users to easily navigate obstacles as the front wheels can pivot over them. The Arrow FWD is particularly suited for both indoor and outdoor use, as it combines the agility of the MWD with the stability seen in the RWD. It features a compact design, making it easier for users to position themselves in various settings and social situations.

All three models utilize Invacare's cutting-edge technologies, such as advanced control systems and customizable seating options, enabling users to find their optimal comfort and support levels. The customizable features also cater to individual user needs, promoting enhanced independence.

In summary, Invacare’s MWD, RWD, and Arrow FWD wheelchairs represent an impressive blend of functionality, durability, and user-centric design. Each model presents its own unique technologies and attributes, allowing users to make informed choices based on their specific mobility requirements, lifestyle, and preferences. Whether navigating tight indoor spaces or tackling outdoor challenges, Invacare’s range of wheelchairs ensures that users can experience mobility with confidence and ease.
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