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12
TROUBLESHOOTING
PROCEDURE 2
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WARNING
When reading a hydrometer, DO NOT al-
low any liquid to come in contact with
your eyes or skin. It is a form of acid and
can cause serious burns, and in some
cases, blindness. If you do get battery acid
on you, flush the exposed areas with cool
water IMMEDIATELY. If the acid comes into
contact with eyes or causes serious burns,
get medical help IMMEDIATELY.
The battery acid can damage your wheel-
chair, clothing, and household items.
Therefore, take readings cautiously and
only in designated areas.
ONLY use distilled water when topping off
the battery cells.
Most batteries are not sold with instructions.
However, warnings are frequently noted
on the cell caps. Read them carefully.
1. Remove the battery box(es). Refer to
INSTALLING/
REMOVING BATTERY BOXES - GROUP 24 BAT-
TERY BASE FRAMES or INSTALLING/REMOVING
BATTERY BOX - GROUP 22 BATTERY BASE
FRAMES in PROCEDURE 9 of this manual.
2. Remove the battery caps from the battery.
3. Squeeze the air from the hydrometer.
4. Place the hydrometer into a battery cell.
NOTE: DO NOT fill hydrometer more than 3/4 full.
5. Draw up sufficient acid to cover float balls.
6. Tap lightly to remove air bubbles.
7. Number of floating balls indicates charge.
Number of Floating Balls
0 Discharged
1 25% Charged
2 50% Charged
3 75% Charged
4 100% Charged
* 5 Overcharged
* Check charging system.
8. Flush the liquid back into the same cell after reading
the float. Repeat this step until all cells have been prop-
erly read. A shorted or dead cell can be detected when
it is the only cell that does not charge.
FIGURE 2 - USING HYDROMETER TO CHECK
BATTERY CELLS (LEAD ACID)
Number of Floating
Balls Will Vary
According to Charge
9. Flush hydrometer in cold running water by allowing
the water to rise into hydrometer as far as possible.
Do this several times to guard against burn damage.
10. Replace the battery caps.
11. Reinstall battery boxes. Refer to
INSTALLING/RE-
MOVING BATTERY BOXES - GROUP 24 BATTERY
BASE FRAMES or INSTALLING/REMOVING BAT-
TERY BOX - GROUP 22 BATTERY BASE FRAMES
in PROCEDURE 9 of this manual.
MOTOR TESTING (FIGURE 3)
NOTE: This procedure should only be performed on
wheelchairs with the conventional motor/gearbox assem-
bly. For gearless/brushless motors, there are no service-
able parts. Return motor to manufacturer for testing.
1. On the 4-pin motor connector, locate the two (2) con-
tacts in the red and black housings.
2. Set the digital multimeter to measure ohms (Ω).
3. Measure the resistance between the two (2) motor
contacts.
NOTE: A normal reading is between 1 and 5 ohms
(Ω). A reading of 0 ohms (Ω) or in excess of 15 ohms
(Ω) indicates a problem. High readings are generally
caused by bad connections and/or damaged brushes.
Contact authorized dealer or Invacare.
TROUBLESHOOTING