EFFECTIVITY:
24-30-00 Jan 10/90
PIPER AIRCRAFT PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. DC Generation (continued)
18. FaultIsolation(continued)
CHART 3 FAULT ISOLATION (BATTERY) (Sheet 3 of 3)
Fault
Terminallinks discolored or burned.
Burned or pitted terminals.
Burnedorpitted output receptacleterminals.
Distortionof cell case and cover.
Distortion of battery case or cover.
Cause
Loose terminal hardware.
Foreign metallic objects in the battery; tools dropped into the open battery.
Improperlyfitting or loose mating output connections.
Cellwith internal short.
Charger failure.
Plugged vent caps, minor explosion.
Overheatedbattery, improper cooling.
Major explosion: Loose links Dry cells
High charge voltage
Charger failure
Remedy
Clean or replacelinks and tighten all terminal hardwareto specified torque values.
Locateand remove foreign objectsand replace defective parts.
Replaceboth mating connectors.
Discharge,disassemble,and replace defective cells.
and replace defective cells.
Discharge,disassembly,
Discharge,disassemble,and replacedefective cells, and replacevents.
Discharge,disassemble,
and replacedefectiveparts.
and replacedefectivecells, link, vent caps, hardware,and case. Replace battery caseand cover.
Discharge,disassemble,
EFFECTIVITY:
040-999
Jan 10/90
24-30-00
Jan 10/9024-30-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. DC Generation (continued)
CHART 4
NICKEL CADMIUM BATTERY SPECIFICATIONS
BatteryType: 40776
Capacity: 40 AH at the 1 hour rate
Numberof series connectedcells -20 -Nominal Voltage-24
ConstantCurrentCharging:
Startingrate(Is) -8.5 to 22 amperes--Control Point30.5 volts
FinishingRate(If) -4.0 to 10 amperes--TrickleRate215to 430 milliamps
ConstantPotentialCharging:
Voltage(Ec)(See ConstantPotentialChargingV/T Table) 43 amperes min.
Inrushcurrent at above voltage:350 amperes max.
Floating Voltages:
0°F 29.0 to 31.0 volts
75°F 28.0 to 30.0 volts
100°F 27.4 to 29.4 volts
Discharge Rates: Cutoff Voltage:
Max. Short Time:
10 sec. 1720amperes
30 sec. 860 amperes
Max.Continuous:
15.0
430 amperes
20.0
1 hour rate: 43 amperes
5 hour rate: 9 amperes 21.0
22.0
20 hour rate: 2.25amperes
(Cell)TerminalType: Screw--Thread Size: 10/32--Torque: 34-38in. Ibs Depthin Baffle: ElectrolyteLevel: 20 mm Duringlast 20 minutesof charge
CHART 5
CONSTANT POTENTIAL CHARGING V/T TABLE
Battery Temp. (°F) Volts/Cell Voltage
0° 1.565 31.3 ± 0.5
20° 1.545 30.9 ± 0.4
40 ° 1.525 30.5 ± 0.3
1.505 30.1 ± 0.2
60°
80° 1.485 29.7 ± 0.2
1000 1.460
29.2 ±0.2 120° 1.440 28.8 ± 0.1 140 ° 1.420 28.4 ± 0.1
EFFECTIVITY:
040-999
24-30 00 PAGE 17
Jan 10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. DCGeneration (continued)
Circuit DiagramNo.1
Ammeter
Load Load Resistor Resistor
Shunt
Discharge Circuit (Preferred) DischargeCircuit (Alternate)
Circuit Diagram No. 2
Ammeter
TemperatureProbe Ammeter
Temperature Probe I Knife Switch Shunt
ChargingCircuit (Preferred) Charging Circuit (Alternate)
Charge/ Discharge Schematics (Typical Service) Figure 301
EFFECTIVITY:
040-999
Jan 10/9024-30-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
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