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Hitachi UC 14YFA, Technical Data And Service Manual

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Hitachi UC 14YFA Technical Data And Service Manual Download Page 11

9

7. QUESTIONS AND ANSWERS ON MODEL UC 14YFA

   Q1  What are typical charging methods?

   A1  The most recent electronic charging methods are outlined below.

 Method C

Batter

y v

oltage

Charging time

The descending voltage ( ---        ) of

the battery in the final stage of

charging is detected, and charging

is automatically suspended.

 ---        Charging method

dT/dt Charging method

 Method B

Batter

y temper

ature

Charging time

dT/dt

Sudden temperature rise just

before full charging is detected and

charging is suspended (Ni-MH

battery)

UC 14YFA

UC 24YFA

UC 24YFB

UC 24YC

Batter

y v

oltage

Charging time

Voltage variation factor immediately

before battery becomes fully

charged is detected, and charging

is automatically suspended.

      Charging method

 Method A

UC 14YFA

UC 24YFA

UC 24YFB

UC 24YC

UC 14YF2

Summary of Contents for UC 14YFA

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL CHARGER UC 14YFA SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No F888 Aug 2003 U MODEL UC 14YFA Hitachi Power Tools ...

Page 2: ...Precautions in Sales Promotion 8 7 QUESTIONS AND ANSWERS ON MODEL UC 14YFA 9 8 GENERAL PRECAUTIONS 12 8 1 Model UC 14YFA 12 8 2 Pilot Lamp Indications 12 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 13 9 1 Disassembly 13 9 2 Reassembly 13 9 3 Confirmation after Reassembly 13 10 TROUBLESHOOTING GUIDE 14 10 1 Troubleshooting Based on Pilot Lamp Indications 14 10 2 Troubleshooting and Repair Procedure...

Page 3: ...es EB 712S 7 2 V 1 2 Ah EB 912S 9 6 V 1 2 Ah EB 1212S 12 V 1 2 Ah EB 1412S 14 4 V 1 2 Ah EB 7S 7 2 V 1 3 Ah EB 9S 9 6 V 1 3 Ah EB 12S 12 V 1 3 Ah EB 914 9 6 V 1 4 Ah EB 1214 12 V 1 4 Ah EB 1414 14 4 V 1 4 Ah EB 9B 9 6 V 2 0 Ah EB 12B 12 V 2 0 Ah EB 14B 14 4 V 2 0 Ah EB 1220BL 12 V 2 0 Ah EB 9M 9 6 V 2 0 Ah EB 12M 12 V 2 0 Ah EB 924 9 6 V 2 4 Ah EB 1224 12 V 2 4 Ah EB 1424 14 4 V 2 4 Ah EB 9H 9 6 V...

Page 4: ...s 3 0 Ah 70 minutes 2 0 Ah 50 minutes 2 4 Ah 60 minutes 3 Hitachi original charge control mechanism for longer battery life Easy to read visual display of charging status through constant lighting or flashing of red and green pilot lamps Fig 1 3 way overcharging protection systems for longer battery and charger life Capable of recharging both nickel cadmium Ni Cd and nickel metal hydride Ni MH bat...

Page 5: ...ow The thermistor is an element to detect the battery temperature The 95 C thermal protector incorporated in each 14 4 V battery interrupts the recharging circuit when the battery temperature reaches 95 C The discriminating resistor is incorporated in each nickel metal hydride Ni MH battery to distinguish them from the nickel cadmium Ni Cd batteries Because the nickel metal hydride Ni MH batteries...

Page 6: ...y temperature reaches 60 C in the case of the nickel cadmium Ni Cd batteries or 55 C in the case of the nickel metal hydride Ni MH batteries C Timer Should both the system dT dt system and the temperature sensor fail the timer automatically stops charging within 120 minutes from the beginning of charging Note 2 The voltage of the battery increases during charging and begins to fall when further ch...

Page 7: ... 0 1 sec OFF Stays ON constantly Battery or charger is faulty Charging not possible because battery temperature is too high Pilot lamp indications Battery type Battery temperature range during charging Charging of heated high temperature batteries Heated high temperature battery Nickel cadmium Ni Cd batteries 5 C to 60 C Green pilot lamp lights When battery temperature is reduced to 55 C green pil...

Page 8: ...arisons with Similar Products Power input 2 6 A Approx 50 minutes for 2 0 Ah 1 Chargeable Ni Cd battery temperature range 2 Chargeable Ni MH battery temperature range HITACHI UC 14YFA Charging time Overcharge protection system Charging voltage min 50 2 0 Ah V 7 2 to 14 4 Charging current A 2 6 Power input W 56 Operating ambient temperature range C 0 to 40 Chargeable battery temperature range C 1 5...

Page 9: ...If charging is attempted when the ambient temperature is above 40 C charging is stopped before the battery is fully charged due to temperature rise during charging because the difference between the upper limit of the rechargeable battery temperature Ni Cd batteries 60 C Ni MH batteries 55 C and the ambient temperature is small 4 Do not use the charger for successive charging In very hot locations...

Page 10: ...g This phenomenon is common to all existing batteries and chargers which employ temperature sensitive overcharge protection devices The cooling time required before recharging varies from a few minutes to about 30 minutes depending on the load duration of use and ambient temperature 6 2 2 Inserting a battery into a charger in reverse direction can cause serious damage to the battery and the charge...

Page 11: ...ng is automatically suspended Charging method dT dt Charging method Method B Battery temperature Charging time dT dt Sudden temperature rise just before full charging is detected and charging is suspended Ni MH battery UC 14YFA UC 24YFA UC 24YFB UC 24YC Battery voltage Charging time Voltage variation factor immediately before battery becomes fully charged is detected and charging is automatically ...

Page 12: ...re the battery is fully charged and then suspends charging The dT dt system detects a sudden temperature rise which occurs just before the battery is fully charged and then suspends charging Q4 Is there any difference in the amount of work possible per charge of batteries charged with the microcomputer control system and those charged with dT dt microcomputer control system A4 The dT dt microcompu...

Page 13: ... chargeable temperature of the battery Chargeable temperature range of the battery when starting charging UC 14YF2 UC 24YC UC 24YFA UC 14YFA 5 C to 55 C Charger Ni Cd battery Ni MH battery 5 C to 55 C 5 C to 55 C 5 C to 60 C 0 C to 45 C 0 C to 45 C 0 C to 45 C 0 C to 45 C 60 C 60 C 60 C 65 C 55 C 55 C 55 C 55 C Charging is automatically stopped when the system or the dT dt system detects completio...

Page 14: ... printed circuit board and terminals 2 The printed circuit board consists of high frequency power transformer microcomputer and other electronic devices to permit rapid charging and to protect against overcharging Case B Printed circuit board Terminal Case A Case A Case B Terminal 8 2 Pilot Lamp Indications Refer to 4 1 5 ...

Page 15: ...d When charging an EB 14B battery confirm that the red pilot lamp flashes at 1 second intervals approx 50 minutes from commencing charging 2 Measure the insulation resistance and conduct a dielectric strength test Insulation resistance 10 MΩ or more between the plug blade of cord and the Name Plate or case fastening screws with DC 500 V Megohm Tester Dielectric strength test a Between the plug bla...

Page 16: ...aulty PCB 1 Poor connection of T or S terminal 2 Faulty PCB 1 Battery connected in reverse direction 2 Faulty battery short circuit or open circuit 3 Faulty PCB Typical causes Refer to trouble mode A Check procedures Refer to trouble mode B Refer to trouble mode C Refer to trouble mode D NO NO NO NO YES YES YES YES Pilot lamp fails to light or flash Apply rated voltage Is rated voltage applied to ...

Page 17: ...s been connected Are the connection terminals of the charger or the battery dirty deformed or otherwise abnormal Faulty internal circuits Replace PCB Remove dirt or correct abnormality Replace the battery YES Is the fuse on secondary side blown NO Replace the fuse Is the resistance between S and terminals 2 KΩ to 100 KΩ ...

Page 18: ...100 KΩ Faulty internal circuits Replace PCB Pilot lamp remains green red fails to light after battery has been connected Allow battery to cool prior to charging NO Conduct charging within designated temperature range 0 C to 40 C Clean or repair deformed terminals For the Ni Cd batteries charging cannot be accomplished if battery temperature is above 55 C For the H type batteries charging cannot be...

Page 19: ... in correct direction YES Remove foreign matter Is the battery connected in reverse direction Is there some sort of conductive foreign matter in the hole where the battery is inserted NO NO YES Replace the battery Is the battery short circuited or opened Replace PCB Faulty internal circuit ...

Page 20: ...18 11 STANDARD REPAIR TIME UNIT SCHEDULES MODEL 10 20 30 40 Fixed Variable UC 14YFA Work Flow Case A Fuse 3 15 A Fuse 5 A Light Bar 60 min 50 Case B Printed Circuit Board Ass y Cord General Assembly ...

Page 21: ...ELECTRIC TOOL PARTS LIST LIST NO F888 CHARGER Model UC 14YFA 2003 8 20 E1 Hitachi Power Tools 1 2 3 4 5 6 7 8 9 10 ...

Page 22: ...IT BOARD ASS Y 120V 1 INCLUD 3 10 4 322 192 PRINTED CIRCUIT BOARD ASS Y 220V 230V 1 INCLUD 3 10 4 322 264 PRINTED CIRCUIT BOARD ASS Y 240V 1 INCLUD 3 10 5 319 777 CASE B 1 6 300 036 TAPPING SCREW W FLANGE D3X20 4 7 NAME PLATE 1 8 319 934 LIGHT BAR 1 9 318 262 CORD 1 9 318 259 CORD 1 FOR USA CAN 9 318 260 CORD 1 FOR NZL AUS 9 318 261 CORD 1 FOR GBR 9 319 327 CORD 1 FOR CHN 10 322 263 FUSE 250V 5A 1...

Page 23: ......

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