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Operating Instructions

1

01004C

DUAL MODE BATTERY CHARGER

TYPE 24EL8

TECHNICIAN DIAGNOSTIC AND SERVICE INSTRUCTIONS

To discourage end users from disassembling the
charger, UNDERWRITERS LABORATORIES and
CANADIAN STANDARDS ASSOCIATION require
that the internal replaceable fuses be omitted from the
Owners Manual wiring diagram and parts list.  Those
parts are included in the enclosed service wiring
diagrams and parts lists.

Refer to the Owners Manual for installation, normal
operating procedures, and safety precautions.
FOLLOW ALL SAFETY PRECAUTIONS.

DUAL MODE CHARGER TEST PROCEDURES

Disconnect both the AC and DC charger cordsets.
Remove the screws on each side of the charger and
lift the cover off.  Refer to the Service Parts List and
compare to the charger under test to locate the
described test points.  Make sure that all the charger
internal connections are secure and tight.

TEST FOR CORRECT AC VOLTAGE AVAILABLE
AT TRANSFORMER

Connect the AC cord to a live outlet; move the power
switch to AUTO.  Verify that AC line voltage is
measured across terminals P-P on the transformer
(110-127 for 120 VAC models; 215-245 for 230 VAC
models).

TEST FOR CORRECT AC VOLTAGE AT
TRANSFORMER AUXILIARY COIL

Verify that approximately 26-30 VAC is measured
across terminals 1-3 on the transformer.  Unplug the
electronic timer assembly and verify this same
voltage across the control cable assembly electronic
timer edge connector contacts 4-6.

One half of this measured AC voltage should appear
across transformer terminals 2-1 and 2-3.  With the
electronic timer assembly unplugged, the same
reading should also appear across plug contacts 3-4
and 3-6, and 7-4 and 7-6, as well as 9-4 and 9-6.

TEST FOR CORRECT AC VOLTAGE AT
TRANSFORMER SECONDARY

Verify that approximately 58-64 VAC is measured
across transformer secondary terminals 4-7.  Half of
this measured AC voltage should also appear across
the transformer coil center tap and each end,
transformer terminals 5-7 and 5-4, as well as 6-7 and
6-4.

Transformer failure is indicated when the measured
AC voltages are significantly lower than specified.

TEST FOR COMPLETE CIRCUIT FROM CHARGER
TO WHEELCHAIR BATTERIES IN THE
WHEELCHAIR

Move the power switch to OFF and unplug the AC
power cord and connect the charger DC output plug
to the charging receptacle of the wheelchair under
test.

Remove covers from wheelchair battery box and
measure battery system voltage at the battery
terminals inside the battery box, about 24 VDC.

Make sure this same battery pack voltage, about 24
VDC, is measured across where the RED lead from
the thyristor assembly connects to the ammeter
(+, POSITIVE), and transformer terminal 5 as well as
terminal 6 (-, NEGATIVE).  Refer to the wiring
diagram.

IF THE CORRECT BATTERY VOLTAGE DOES
NOT APPEAR INSIDE THE CHARGER, THEN
TEST ALL CIRCUITS UNTIL THE OPEN CIRCUIT
IS ELIMINATED.

Repair or replace:  Wheelchair charging circuit wiring,
or wheelchair charging circuit fuses and/or
fuseholders, or wheelchair charging circuit breakers,
or wheelchair charging receptacle.  Charger DC
cordset with charging plug, or charger DC fuse and/or
fuseholders.  Charger control cable assembly if shunt
resistor tests as an open circuit, or charger ammeter if

Содержание 24EL8

Страница 1: ...nsformer terminals 2 1 and 2 3 With the electronic timer assembly unplugged the same reading should also appear across plug contacts 3 4 and 3 6 and 7 4 and 7 6 as well as 9 4 and 9 6 TEST FOR CORRECT AC VOLTAGE AT TRANSFORMER SECONDARY Verify that approximately 58 64 VAC is measured across transformer secondary terminals 4 7 Half of this measured AC voltage should also appear across the transform...

Страница 2: ...ry DO NOT USE A HIGHER VOLTAGE OR LARGER BATTERY TO PERFORM THIS TEST OR YOU CAN DESTROY THE THYRISTOR Connect the AC cord to a live outlet set the power switch to AUTO unplug the electronic timer and connect the charging plug to a fully charged battery pack Connect a lead from the NEGATIVE end of the AA penlight to contact 9 or 7 or 3 of the electronic timer plug Momentarily touch a lead from the...

Страница 3: ... 13811S 13811S FUSEHOLDER AC AND DC CLIP SINGLE 10375S 10375S 10375S FUSEHOLDER TAG DC 14329S 14329S 14329S FUSE DC 15 AMP AGC 15 03838S 03838S 03838S POWER SWITCH SLIDE SPST 125 VAC 6 AMP 15184S 15184S 15184S FUSEHOLDER TAG AC 13919S 13919S 13919S FUSE AC 5 AMP MDX 5 125V SLOW BLOW 16208S 16208S 16208S BUSHING INSULATOR 6N3 4 FOR CORDSETS 04275S 04275S 04275S CORDSET AC 18 3 W MOLDED PLUG 102 143...

Страница 4: ...USEHOLDER TAG DC 03838S FUSE DC 15 AMP AGC 15 16247S POWER SWITCH SLIDE DPST 250 VAC 6 AMP 15897S FUSEHOLDER AC CLIP DUAL 16249S FUSEHOLDER TAG AC 16268S FUSE AC 2 25 AMP MDA 2 5 250V SLOW BLOW 04275S BUSHING INSULATOR 6N3 4 FOR CORDSETS 16243S CORDSET AC 18 3 W O PLUG 108 11687S CORDSET DC 14 2 80 2 30 AMP POWERPOLE 14421S CORDSET DC 14 2 108 BLACK RED POWERPOLE 14422S CORDSET DC 14 2 108 YELLOW ...

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