Testing Of Components; Power Transformer, T1 - HindlePower SCR series Operating Instructions Manual

1. TROUBLE SHOOTING PROCEDURE
a. When a charger is not operating properly, the cause must be determined by checking various
components until the fault is located.
b. The major components are not checked in the order as listed in Section II, 9, since a charger may
exhibit a number of difficulties, each with different symptoms. In many cases, failure of one component
may cause another component or part to fail. Therefore, the following paragraphs treat major components,
functional circuits and parts individually (or by symptom). Together with serviceability measurements and
tests, the faulty part or component should be located.
c. Most of the following checks can be performed with an oscilloscope, a voltohmmeter (similar to a
Simpson Model 260) and an SCR tester.
d. Consult the trouble-shooting tabulation in Table A on page 27. When using the table, first locate the
fault symptom observed (in the left hand column) then follow the sequence for checking components in
the numerical order listed (1, 2, 3 etc.) for that particular symptom. Follow this check sequence until the
trouble is located. After correcting the trouble, check the charger for normal performance as described in
Section II, 8.
e. In addition to those symptoms listed in Table A, the following procedure should be followed:
For any condition
•
Check voltage of the AC supply to insure that it is within 10% of the value of the specified input voltage.
•
Examine charger for any evident loose or improper connections, particularly at the control unit, transformer
T1, input and output terminal board.
•
Check continuity of battery circuit by comparing voltage at charger terminals with total of cell voltages.
•
Check accuracy of voltmeter and ammeter on the charger.

2. TESTING OF COMPONENTS

a. Power Transformer, T1
1. With the AC and DC circuit breakers open or OFF, open the cabinet and carefully check the line
voltage across line terminals on TB1, terminals L1 to L2. Refer to Section III, 2, b, 1 if no AC voltage is
indicated. Check the wiring connections to ascertain that unit has the proper primary tap connections for
the line voltage indicated. Turn on the AC circuit breaker, CB1. Check that the voltage at the primary is
the same as that of the line. (If not, CB1 or wiring between it and T1 is open.) In this case proceed with
checks under Section III, 2, c, 1.
2. Check AC secondary voltage on T1 (see Table B below for expected voltage values). If
secondary voltages are much less than indicated, then either T1 is at fault or the power regulating devices
SCR1 or SCR2 are faulty.
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