QM-7 SERIES SERVICE MANUAL
PAGE 5.1
JANUARY 2012SUNRISE MEDICAL
Section 5
Battery Testing
Note: The QM-710 power chair uses either (2) 22NF, or GRP 24 batteries connected in series.
The circuit is protected by a non-serviceable fusible link in each battery harness. Prior
to performing any test, the battery terminals should be clean and tight. For Access to the
Batteries, Refer to Section 7: Battery Access/Removal.
1. Check for initial battery voltage at the joystick
using the battery charger connector. Connect the
Multimeter to the two outside pins (fi gure 5.1.1).
Pin 1 is positive (+) and pin 2 is negative (-). Fully
charged batteries are typically 25.6 VDC for the
pair, or 12.8 VDC each. Discharged batteries are
24 VDC or less for the pair.
2. Load test the batteries using either a commercial
load tester or the following procedure.
fig. 5.1.1
fig. 5.1.3
fig. 5.1.2
Note: Voltage greater than 26 to 28 VDC indicates the batteries are either over-charged, or have
just been disconnected from the battery charger, and contain a surface charge. If the batteries
are not freshly charged and voltage is excessive, inspect battery charger.
To use the power chair’s motors as a load tester,
complete the following steps:
a. Disengage the motor/gearbox so the motors
can run in freewheel (fi gure. 5.1.2).
b. Connect the Multimeter to the joystick and
record the voltage (fi gure. 5.1.3). If the voltage
indicates a surface charge, run the motors for
a few minutes to dissipate the surface charge.
Note: in this example, a small surface charge is
present.
c. After the voltage has stabilized, record the
voltage. Typical value for a fully charged pair of
batteries is 25.6 VDC (12.8 VDC each).
Warning: Failure to disengage the gearbox in the next step can cause unexpected operation
of the power chair.
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