Precision Trading 60 R3.0 operating instructions Battery Testing Notes

Page 60

Operator Manual, Supercharger 60

R3.0

12.BATTERY TESTING NOTES

Note, hazardous condition: Handle batteries with extreme care as they are capable of very high discharge rates if short circuited.

Check the Battery Manual, IMM or Aircraft Manufacturer Instructions for information on charging, discharging and testing.

The Charge & Float and the Charge & Peak Stop modes are particularly useful with lead acid batteries, where the battery voltage is a better indicator of the state of charge, as compared with Nickel-Cadmium batteries where terminal voltage gives little information on the state of charge.

Lead-Acid batteries are normally float charged (constant voltage) typically at 2.3V/cell. A 6 cell pack (12V) will then be float charged with the voltage selector at 13.8V. In this mode, the charge current is set to the highest level that the cells will safely take (typically up to 1C depending on the battery type and specific manufacturer’s instructions). This will be the charge current until the float voltage is reached, at which time the current will diminish to the level needed to maintain the float voltage.

Lead-Acid batteries can also be charged in a manner in which it is possible to know much better the end of charge. When a Lead-Acid cell is charged with constant current at C/15 to C/10, the end voltage will rise rapidly at about 90 to 95% of charge, which occurs at about 2.4 to 2.45V/cell. A 5A-hr, 6 cell pack, can be charged at 335mA to 500mA, with the voltage selector at 14.7V. The CHARGER-ANALYZER will stop the charge operation when the rapid rise of end-of-charge voltage is detected.

For Nickel-Cadmium batteries, the most effective charge method is constant current vs time. In the absence of any particular instructions from the manufacturer, charging at c/10 for 12 to 16 hours will insure a complete charge.

The Nickel-Cadmium batteries can also be charged in the float mode, with a voltage of 1.4 V/cell (a 20 cell battery would be set to 28.0V).

NOTE: Prolonged use of the float (constant voltage) method on Nickel-Cadmium batteries will result in cell imbalance, which could eventually lead to premature cell failure due to un-even charge acceptance and un-even discharge capacity.

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Contents Specifications Installation Calibration Table of Figures Introduction and System Description Operator Manual, Supercharger R3.0 Block Diagram Constant Current Charge normal mode Condensed Operating InstructionsConstant Voltage Peak Voltage Charge Discharge Specifications ChargeMaximum Current 50 Amps Minimum Increment 0.1 AMP Overtemp Protection OVER/UNDER Current ProtectionOvervoltage Protection Reverse Polarity ProtectionDischarge Maximum CurrentMinimum Increment Timer Terminal VoltageOverheat Protection Power Failure Protection Line Input VoltageAccuracy and Stability Time LimitsDigital Panel Meters VoltmeterControls and Displays 10 SW6 Voltage Mode Selector 11 SW7 Timer Speed SelectorSW4 Cell Selector SW5 Digital Voltmeter Input SelectorFront Panel 12 DS1A Reset 13 DS1B CYC END14 DS2A Dual 15 DS2B MainAudible Alarm Modes of Operation Constant Current ChargeSingle Rate Constant Voltage Charge Peak Charge Analysis Auto CUT-OFF Deep Cycle Full DischargeOperating Instructions GeneralConstant Current Charge Peak Voltage Charge Discharge Float/Peak Voltage Chart Cell Float Peak Selector VoltageOperating Notes and Precautions Installation Bench SpaceLine Voltage Line Voltage Wiring, 208/230V Required Test Equipment and Accessories Verification of PerformanceVisual Verification Timer Verification Battery Overtemp CUT-OFF Voltage Fault TestReverse Polarity Test Overvoltage CUT-OFFDischarge Voltage CUT-OFF Full Discharge Current TrackingVoltage Control Float Voltage Peak VoltageMeters Circuit Board Adjustments and Calibration CalibrationDigital Meters see Figure Voltmeter Meters Board Adjustments Control Switch Board Adjustments 3.2. R11 Discharge Cell Calibrate3.5.2. R28 LOW Current Calibrate 3.5.3. R25 High Current CalibrateCurrent Control Board Adjustments Control Board as ground reference for voltage measurements Operator Manual, Supercharger R3.0 Voltage Control Board Adjustments Operator Manual, Supercharger R3.0 Circuit Board Sequence Troubleshooting and Repairs TroubleshootingReset Indicator and Timer Display do not Turn on Burned Resistors in the Discharge HeatsinksFault Lights on and no Audible ALARM. Unit Runs Normally Current Fault in CVVoltage Fault in CV or Peak Current Tracking is OFF by a Small Constant AmountProcedure Finding a Shorted Discharge TransistorEquipment Required Measuring for a shorted transistor Location of Current Limiters Power Block Diagram Replaceable Modules and Parts Circuit BoardsParts OtherBattery Testing Notes Disclaimer Revision Index Revision Date

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