SERVICE SHEET No. 1050 (contd.)
Rectifier-Bench Testing
VI-will measure the volt drop across the rectifier plate.
V2-must be checked when testing the rectifier plate, to make certain the
supply
voltage is the recommended 12 volts on load.
It is essential that the supply is kept at 12 volts for these Tests.
Forward Resistance Test
Test 1.
Connect test leads in turn across terminals 2 and 1, bolt and 1, bolt and 3, 2 and 3. Reading in
all positions should not be greater than 2.5 volts. Keep the testing time as short as possible
to avoid overheating the rectifier cell. Note.-If the latter type of rectifier, which has no
terminal markings, is fitted, the same procedure is followed. The same voltage values also
apply.
Back Leakage Test
Test 2.
Proceed as for Test 1, and test each cell in turn, but reverse the test leads. Reading on V 1
should not be less than 2 volts below the open-circuit reading on voltmeter No. 2, i.e., 10 volts.
Conclusions from these Tests
Test 1.
If the voltage reading on VI is more than 2.5 volts, on any cell, it is aged and the rectifier should
be replaced.
Test
2. If the.
voltage reading on U1 is less than 10 volts, on any
cell,
the rectifier is shorted and should
be replaced.
Important
Before fitting a replacement rectifier, check the following points:1.
Check that battery is correctly connected,
Positive
to
Earth. 2.
Check
rectifier visually for signs of damage.
Do not make any adjustment to the nut which holds the elements together on the through bolt. The
efficiency of the rectifier depends upon the correct tension of this bolt. The tension on the bolt is set correctly
before leaving the works, and cannot
be
adjusted correctly--in service. :~::
Summary of Contents for TW2
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