Checks To Make If Malfunctioning; Customer Options - HindlePower SCR series Operating Instructions Manual

1. If the batteries are in a discharged condition, switching to the equalize mode will cause the
charger to automatically go into a current limit condition. If, however, the batteries are fully charged they
probably will not draw current in the current limit range. In order to cause this condition, it will be
necessary to connect additional load to the battery charger or battery bank. This can be resistive elements
or turning on the normal load of the installation. When current limiting is encountered, observe that the
charger voltage will be reduced below its set value by the current limit feedback signal. Observe that as the
current limit condition continues, the voltage will slowly increase as the batteries take on a charge.
Eventually the current will begin to decrease below the current limit value and continue to decrease to a
value less than 100% of rated output current. As the current decreases below 100% of rated output current,
the voltage will become constant at the equalize value and remain so. To check the system response
proceed with Section IV, 2, a, 2 below.
2. Now turn AC breaker OFF to simulate line voltage failure. Charging current should return to
zero (panel ammeter), and the voltage should reduce slightly. Place a load on the battery and discharge it
heavily for a short period of time until the voltmeter drops to float value or slightly lower. Return AC
breaker to ON and observe that charge ammeter again reads 110% of charge rate and voltage is less than
the equalizing level. If current is greater than, or less than 110 percent of rated charge, open the cabinet
and locate the CURRENT LIMIT potentiometer on the control trigger board (A1 Assy.). This is R11 on
component layout page 29 and schematic page 30. Adjust this control for 110% charge current. Repeat AC
circuit breaker ON-OFF sequence above. If charge rate is still 110% rated value for which it was set, close
the cabinet. Restore the charger to float mode.
b. If all of the above adjustments were attempted and a high current persists, the current limit circuit on
the control trigger board or the ammeter or shunt used for current sense may be defective. The
interconnecting wiring may also be faulty. Make the following checks to isolate the fault.
1. Turn the current limit control (R11 on control trigger board) to determine if it has any effect on
the high output current reading. If it does, make the adjustment for 110% rated current for a current limit
setting as described in paragraph IV, 2, a, 2 above.
2. If no effect is noted, IC1 on the control trigger board may be defective, if so replace.
3. Check the voltage generated across the ammeter (or meter shunt) to determine that sufficient
voltage is available at rated current to activate the current-limit feedback amplifier. See Section III, 2, h.
Using a sensitive DC voltmeter measure across the ammeter and from pin #1 to pin #10 (signal ground) on
the plug of the trigger control board, A1 assembly. If the sense voltage is not present at the control trigger
board check the wiring. If the wiring is satisfactory, proceed with the check sequence listed in Table A
trouble shooting chart on page 27.
The following pages describe customer options included in battery chargers. The text describes the basic
operational philosophy and briefly the theory of operation. The block diagrams or schematics are shown at
the end of Section VII in numerical order of the "EJ" specification number.
SECTION V

CUSTOMER OPTIONS

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