Caution; Quick First Checks; Troubleshooting Procedure - HindlePower UMC Series Operating And Service Instructions

UNIVERSAL MAINTENANCE CHARGER (UMC)
...!

CAUTION...

Before troubleshooting, always isolate and deenergize the charger by opening
the ac circuit breaker (CB1) and the dc circuit breaker (CB2). This avoids the possibility of
personnel injury or equipment damage from high short circuit currents.
breaker terminals and terminal boards have dangerous voltages across them even when breakers are
open. After isolating the charger, check to ensure the voltage across filter capacitors is zero, for
once charged they take several minutes to discharge if bleeder resistor (R1) is open. The dc circuit
breaker (CB2) is provided to isolate the charger from the battery. Battery bus voltage will still be
present on the input terminals and one side of the dc breaker (CB2). The meter select switch (SW2)
will also hold the battery voltage. It is best to remove the battery connection at the battery for
safety reasons.
AFTER LOCATING THE CHARGER PROBLEM, ALWAYS DE-ENERGIZE ALL
AC AND DC CHARGER INPUTS AT THE POWER SOURCE BEFORE SERVICING
...NOTICE... Most repairs are performed with standard hand tools. Refer to the connection
diagram (JE5040-##) and wire markers during replacement of any components.

1. QUICK FIRST CHECKS

•
Check voltage of the ac supply to ensure that it is within 10% of the value of the specified input voltage.
•
Inspect the I/O connections for proper jumper configuration.
•
Turn the current limit control clockwise.
•
Examine charger for any evident loose or improper connections, particularly at the control unit, transformer
T1, input and output terminals.
•
Check continuity of battery circuit by comparing voltage at charger terminals with total of cell voltages.
•
Check the battery: if a cell is open or a connection is loose current may not flow into the battery bank.
2. 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. A charger may experience more than one problem, each with its own symptoms. In many cases, failure of
one component may cause another component 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 a digital voltmeter or digital multimeter (DVM). An
oscilloscope may also be helpful with more extensive troubleshooting.
TROUBLESHOOTING AND REPAIR
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...NOTICE... Circuit