UC 24YFA - Cloudfront.net
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1. _ __ 15 9 2 Reassembly RT 15 9 3 Confirmation after Reassembly mm a 15 10 TROUBLESHOOTING GUIDE aaa apt u uuu u uu u u u aa s u pata aia 16 10 1 Troubleshooting Based on Pilot Lamp Indications 16 10 2 Troubleshooting and Repair Procedures 16 11 STANDARD REPAIR TIME UNIT 20 Assembly Diagram for UC 24YFA 1 PRODUCT NAME Hitachi Charger Model UC 24YFA 2 MARKETING OBJECTIVE As the cordless tool market expands year by year customers have come to expect a wider range of high voltage products longer run time with high capacity batteries and lower prices The Model UC 24YFA a rapid and low price charger has been developed by making improvements to the current Model UC 24YF that is capable of recharging both nickel cadmium Ni Cd and nickel metal hydride Ni MH batteries from 7 2 V to 24 V in one hour 3 APPLICATIONS Recharging of Hitachi batteries Applicable batteries Ni Cd batteries EB 7 7 2V 1 3Ah EB 9 9 6 V 1 3Ah 12 12V 1 3 Ah 75 7 2 V 1 3Ah EB 9S 9 6 V 1 3 Ah EB 12S 12 V 1 3 Ah EB 14S 14 4 V 1 3 Ah EB 7G 7 2 V 1 7 Ah EB 9G 9 6 V 1 7 Ah EB12G 12 1 7Ah EB 9B 9 6 V 2 0Ah EB 12B 12 V 2 0 Ah EB2. EB24B 50 EB2430H 70 min Ni MH batteries NOTE The recharging time may vary according to the ambient temperature and the power supply voltage 4 1 3 Recharging discharging cycles of battery ambient temperature range between 10 C and 30 C Ni Cd battery about 1 000 times Ni MH battery about 500 times 4 1 4 Capable of recharging batteries with internal temperatures as high as 60 C When a battery with S terminal is used as shown in Fig 3 and Fig 4 the 60 C thermistor operates to permit recharging of batteries heated up to 60 C and as shown in Fig 5 and Fig 6 the 55 C thermistor operates heated up to 55 C Note 1 Wiring diagrams for batteries are shown below The 95 C thermal protector in the batteries EB 14S EB 14B EB 1424 EB 14H EB 1430H EB 18B EB 24B and EB 2430H interrupts the recharging circuit when the battery temperature reaches 95 C A discriminating resistor is provided in Ni MH batteries EB 9H EB 930H EB 12H EB 1230H EB 14H EB 1430H and EB 2430H to distinguish them from Ni Cd batteries Because Ni MH batteries EB 9H EB 930H EB 12H EB 1230H EB 14H EB 1430H and EB 2430H are heated to high temperatures during recharging this charger operates within a range of a 10 C temperature difference between the maximum battery temperature when starting recharging 45 C and the temperature when stopping rechargin
3. Q lt lt gt N je oe ejes gt aaa oie ALTERNATIVE PARTS Printed in Japan 1 01 010130N Hitachi Koki Co Ltd
4. UC 24YFA HITACHI POWER TOOLS TECHNICAL DATA CHARGER Ap UC 24YFA SERVICE MANUAL LIST No F845 Mar 2001 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT CONTENTS Page 1 PRODUCT NAME 1 LA iauDcie iepime 1 SSAOAPPLEICATIONS u Rn 1 X2 IcEelgce 2 4 1 Selling Point Descriptions 3 aeieqieclmm 7 cm eee 7 5 2 Comparisons with Similar Products n s a 7 6 PRECAUTIONS IN SALES PROMOTION u u u 8 RERO 8 6 2 Extra Precautions in Sales Promotion eee eee ame ana aa ana ana 9 7 QUESTIONS AND ANSWERS ON MODEL UC 24 10 8 GENERAL PRECAUTIONS U ideea ai d aaa aia aa 13 8 1 Model UC C 13 8 2 Pilot u u uu a ra a ada e it a d ie iai 14 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 15
5. 40 4 41 temperature range Chargeable battery 1 5 60 4 41 temperature range 2 0 45 Overcharge protection AV system dt dt system Peak cut system battery surface temperature detection timer External dimensions length x width x height mm 226 x 110 x 75 118 x 154 x 80 Weight kg 0 6 1 3 Ibs 0 6 1 3 Ibs 1 Chargeable Ni Cd battery temperature range 2 Chargeable Ni MH battery temperature range 6 PRECAUTIONS IN SALES PROMOTION 6 1 Safety Instructions In the interest of promoting the safest and most efficient use of the Model UC 24YFA Charger by all of our customers it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions 6 1 1 Handling instructions Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give pertinent advice to the customer 1 Connect the charger to an AC power outlet only Use of any other power source DC outlet fuel powered generator etc will cause the charger to overheat and burn out 2 Do not use any voltage increasing equipment transformer voltage regulator etc between the power source and the charger If the charger is used with voltage over and above that indicated on the unit it will not function properly 3 Conduct battery charging in an ambient temperature range of
6. A 2 AANS a LA saa P CC gt CC N M 1 LI ELI e 7Z S 2 13 72222 AZ gt AXSSS NS 8 2 Pilot Lamp Indications Pilot lamp indications range during charging 0 5 5 ON 0 5 sec OFF Prior charging Blinks EE H Stays ON tantl Red pilot lamp During charging Lights A sy remains lit or s flashes Charging Bini 0 5 0 5 sec OFF completed NEN EE Charging not Flickers 0 1 sec ON 0 1 sec OFF Battery or charger possible EEEEEEEEEEEEEE is faulty Charging not possible Green pilot Pigh battery Lights Says ON coneta iy because battery lamp is lit temperature ELS temperature is too high Pilot lamp indications during charging of heated high temperature batteries Battery temperature Battery Type Heated high temperature battery EB 12H EB 1230H EB 14H EB 1430H EB 1830H EB 2430H EB 7 EB 9 EB 12 5 C 40 C Green pilot lamp lights When battery temperature is reduced to 40 C green pilot lamp goes OFF and charging begins 75 7G EB 9S 9G EB 9B EB 9M 5 C 60 C Green pilot lamp lights When battery EB 924 EB 12S EB 12G EB 12B EB 12M temperature is reduced to 60 EB 1224 EB 14S EB 1414 EB 14B
7. y Faulty internal circuits y Replace PCB 18 4 Trouble mode D Pilot lamp flickers red indicating abnormality Is the battery YES Install battey in correct connected in reverse direction Is there some sort of conductive foreign YES direction matter in the hole where the battery is inserted Is the battery short circuited YES gt Remove foreign matter or opened s Faulty internal circuit Replace PCB 19 Replace the battery 11 STANDARD REPAIR TIME UNIT SCHEDULES Variabl MODEL 10 20 30 40 50 60 min Fixed Work Flow UC 24YFA Case A Case B Fuse 3 15 Printed Circuit Light Bar Board Ass y Cord 20 LIST F845 HITACHI ELECTRIC TOOL PARTS LIST CHARGER 2001 1 30 E1 Model UC 24YFA PARTS UC 24YFA CODE NO DESCRIPTION REMARKS HITACHI LABEL 319 776 CASE A 319 781 FUSE 125V 3 15A 319 780 FUSE 250V 3 15A 319 778 PRINTED CIRCUIT BOARD ASS Y 120V 319 779 PRINTED CIRCUIT BOARD ASS Y 230V 240V 319 777 CASE B 300 036 TAPPING SCREW W FLANGE D3X20 NAME PLATE 319 934 LIGHT BAR 318 262 318 259 318 260 318 261 FOR 120V FOR 230V 240V INCLUD 3 INCLUD 3 FOR USA CAN FOR AUS FOR GBR
8. 14B 14 4 V 2 0 Ah EB 18B 18 V 2 0Ah EB 1820 18 V 2 0Ah EB 24B 24 V 2 0Ah EB 9M 9 6 V 2 0 Ah EB 12M 12V 2 0Ah EB 924 9 6 V 2 4 Ah EB 1224 12 V 2 4Ah EB 1424 14 4 V 2 4 Ah EB 1414 14 4 V 1 4 Ah EB 1814 18V 1 4Ah Ni MH batteries EB 9H 9 6 V 2 2 Ah EB 12H 12 V 2 2 Ah EB 14H 14 4 V 2 2 Ah EB 930H 9 6 V 3 0 Ah 1230 12V 3 0Ah 1430H 14 4 V 3 0 Ah EB 1830H 18V 3 0Ah EB2430H 24V 3 0Ah 4 SELLING POINTS 1 Accepts both Ni MH and Ni Cd batteries 2 Rapidly charges all Hitachi EB series batteries Charging time 1 3 Ah 35 minutes 2 0 Ah se acted e 50 minutes 3 0 Ah 1 4 Ah ride S 40 minutes 2 2 Ah 55 minutes 1 7 Ah We aver ap eam ee 45 minutes 2 4 Ah Wares 60 minutes 3 Hitachi original charge control mechanism for longer battery life Recharging discharging cycles of battery ambient temperature range between 10 and 30 C Ni Cd about 1 000 times Ni MH about 500 times General purpose charger capable of recharging 7 2 V to 24 V batteries EB 9 EB 9S EB 12 EB 128 EB 9B EB 9M EB 12B EB 924 EB 12M EB 1414 EB 9H 1224 145 EB 930H EB 12H EB 14B 1230H EB 1424 1814 14 1430H C8 1820 C8 188 248 2430H 3 way overchargi
9. EB 1424 green pilot lamp goes OFF and EB 1814 EB 18B EB 1820 EB 24B charging begins EB 9H EB 930H 0 45 C Green pilot lamp lights When battery temperature is reduced to 45 C green pilot lamp goes OFF and charging begins 14 9 PRECAUTIONS DISASSEMBLY AND REASSEMBLY The Bold numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram for UC 24YFA 9 1 Disassembly 1 Remove the four Tapping Screws W Flange D3 x 20 6 and take off Case A 2 The Printed Circuit Board Ass y 4 and the Cord 9 can then be taken out an assembled body 2 To separate the Print Circuit Board Ass y 4 and the Cord 9 melt the soldered portions with a soldering iron NOTE Ideally the soldered portions should be freed with a solder absorber If a soldering iron must be used use one with a rated power of 35 W 9 2 Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse however special attention should be given to ensure that lamps cord armor and charging terminals are properly installed in their prescribed grooves 9 3 Confirmation after Reassembly 1 Confirm the following when the battery is fully charged Confirm that the red pilot lamp on the charger lights up When charging an EB 14B battery confirm that the red pilot lamp flashes at 1 second intervals approx 50 minutes from commencing charging
10. Thermistor D s 2 2 2 Mem Bg Ni MH Battery f 40 C Thermostat temperature e 30 60 Minute timer gosso e ci dB Ni Cd Battery temperature Charging time Battery internal gas pressure Fig 7 Relationships of time voltage temperature and gas pressure while charging A This detects the increase in battery voltage at the end of charging using the value A V and suspends charging dT dt This system is applicable to Ni MH batteries This detects the variation of Ni MH battery temperature by the value dT dt at the end of charging and suspends charging B Built in battery temperature sensors In the event the A V system fails to detect the voltage change the 40 C thermostat or the 60 C thermistor stops charging when battery temperatures reach their respective values C Timer Should both the A V system dT dt system and the temperature sensors 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 charging is not possible The A V system detects the point where the voltage begins to fall and suspends charging to protect the battery from overcharging Note 3 The temperature rise during charging of a Ni MH battery is higher than with a Ni Cd battery and a sudden temperature rise occurs just before the batte
11. 0 C 40 C If charging is attempted when the ambient temperature is below 0 C overcharging occurs because the thermistor and thermostat do not function properly thereby reducing the service life of the battery If charging is attempted when the ambient temperature is above 40 C charging is not possible for the EB 7 EB 9 and EB 12 batteries because the thermostat is immediately activated to stop charging While it is possible to charge batteries with an S terminal at higher temperatures the service life of the batteries may be considerably reduced 4 Do not use the charger for successive charging In very hot locations if two or more batteries are charged successively the temperature of the charger will rise excessively and might cause the charger to fail Instruct the customer to wait at least 15 minutes before commencing next charging Particular care is necessary in summer or tropical countries when the power source voltage is high 5 Do not insert foreign objects into the air vent on the charger The charger case is equipped with air vents to protect the internal electronic components from overheating Caution the customer not to allow foreign materials such as metallic or inflammable objects to be dropped or inserted into the air vents This could cause electrical shock fire or other serious hazards 6 Do not attempt to disassemble the charger Incorrect parts replacement and or wiring will cause malfunctions which c
12. 2 Measure the insulation resistance and conduct a dielectric strength test Insulation resistance 10 MO 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 blade of cord and the charging terminal blade b Between the plug blade of cord and the Name Plate or fastening screws on the case Based on the voltage listed on the Name Plate dielectric strength test should be conducted Voltage on the name plate Test voltage 120 V AC 1 240 V 1 minute 230 V 240 V AC 3 750 V 1 minute CAUTION Without fail insulation resistance must be measured between the plug blade of cord and the Name Plate or fastening screws and dielectric strength test must be conducted between the plug blade of cord and the charging terminal blade or between the plug blade of cord and the Name Plate or fastening screws on the case Under no circumstances should testing be conducted between both blades of the plug or both blades of the charging terminal which may cause burn out of the charger 15 10 TROUBLESHOOTING GUIDE 10 1 Troubleshooting Based on Pilot Lamp Indications Phenomenon Typical causes Check procedures Pilot lamp fails to light or flash 1 Faulty AC cord 2 Blown fuse 3 15 A on primary side Refer to trouble mode A Red pilot lamp does not stay lit continues to flicker after battery
13. 24YC 40 60 C 60 60 45 C 45 C UC 24YF 40 60 C 60 60 45 C 45 C 14YF2 40 60 C 60 C Charging 45 C Charging impossible impossible UC 14YF 40 60 C 60 C Charging Charging Charging impossible impossible impossible UC 12YF 40 60 C Charging Charging Charging Charging impossible impossible impossible impossible UC 12YD 40 60 C Charging Charging Charging Charging impossible impossible impossible impossible UC 12YB 40 60 C Charging Charging Charging Charging impossible impossible impossible impossible UC 12Y 40 40 C Charging Charging Charging Charging impossible impossible impossible impossible UC 12YA 40 C 40 C Charging Charging Charging Charging impossible impossible impossible impossible 12 8 GENERAL PRECAUTIONS 8 1 Model UC 24YFA 1 The outer frame consists of case A and case B Inside the frame there are the 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 A La i i 2772777022227 ANE s ww w w w one f I DI ot 2 ZZY ZZY hehe TIL TFT PT TIT Case B Printed circuit board Case A Terminal M SSS 72227
14. S Remove dirt or correct abnormality Check with tester Other than EB 7 9 and EB 12 batteries s the resistance between 5 and terminals 2 KQ to 100 KQ EB 7 EB 9 and EB 12 batteries Is there continuity between T Replace the battery and terminals Faulty internal circuits Replace PCB 17 3 Trouble mode Pilot lamp remains green red fails to light after battery has been connected Is ambient temperature within designated range between 0 C and 40 C Conduct charging within designated temperature range 0 C 40 C Is the battery very hot Allow battery to cool prior to charging For the Ni Cd batteries except EB 7 EB 9 and EB 12 batteries charging cannot be accomplished if battery temperature is above 60 C For H type battery charging cannot be accomplished if battery temperature is above 45 For the EB 7 EB 9 and EB 12 batteries charging cannot be accomplished if battery temperature is above 40 C Are the connection terminals of the charger or the battery dirty or deformed Clean or repair deformed terminals Other than EB 7 EB 9 and EB 12 batteries ls the resistance between S and terminals 2 KO to 100 KQ EB 7 EB 9 and EB 12 batteries Is there continuity between T and terminals Replace battery YES
15. cannot be recharged with the Model UC 24YFA 1 Because the shape of the B 2 7 2 V battery is different from others it cannot be connected to the Model UC 24YFA 2 Even if the B 3 9 6 V battery is connected to the Model UC 24YFA using the optional accessory adapter recharging is not possible because the internal wiring of the battery is different from the others 7 QUESTIONS AND ANSWERS ON MODEL UC 24YFA Q1 What are typical charging methods A1 The most recent electronic charging methods are outlined below Method UC 12Y UC 12YA Method C UC 24YFA UC 24YFB UC 24YC Method 3 UC 24YFA 3 UC 24YFB UC 24YC Charging time UC 24YF UC 14YF2 The 089080009 vpitags AV of UC 14YF the the final stage of UC 12YF charging detected and charging UC 12YD is automatically suspended UC 12YB AV Charging method Battery temperature Charging time Sudden temperature rise just before full charging is detected and charging is suspended Ni MH battery dT dt Charging method 10 Battery voltage Charging time Voltage variation factor immediately before battery becomes fully charged is detected and charging is automatically suspended AN Charging method Q2 Why was the A V microcomputer control system adopted for the Model UC 24YFA A2 If charging is continued after the battery has bee
16. g 55 C 60 C Thermistor Models UC 24YC UC 24 YF UC 14YF2 UC 14YF UC 12YF UC 12YD and UC 12YB 40 C Thermostat Models UC 12Y and UC 12YA 40 C Thermostat Terminal Terminal Terminal Terminal Terminal Terminal Terminal positions Terminal Terminal positions Fig 2 Ni Cd batteries EB 7 EB 9 and EB 12 Fig 3 Ni Cd batteries EB 7S EB 9S and EB 125 EB 7G EB 9G EB 12G EB 9B EB 12B EB 9M EB 12M EB 924 and EB 1224 95 Thermal protector 60 C Thermistor Terminal Terminal Terminal carmini Terminal positions Fig 4 Ni Cd batteries EB 14S EB 14B EB 1424 EB 1414 EB 1814 EB 1820 EB 18B and EB 24B 95 Thermal protector Discriminating resistor Discriminating resistor 55 C Thermistor Terminal Terminal 55 C Thermistor Terminal D Terminal Terminal Terminal Terminal Terminal positions Terminal positions Terminal Terminal Fig 5 Ni MH batteries EB 9H EB 12H EB 930H Fig 6 Ni MH batteries EB 14H EB 1430H and EB 1230H EB 1830H and EB 2430 4 1 5 3 way overcharge protection system Overcharge protection is ensured by a A A V system or dT dt system for Ni MH battery B built in battery temperature sensors thermostat and thermistor and C a timer Overcharge range Battery voltage 7 55 C Thermistor 60 C
17. has been connected 1 Poor connection of T or S terminal 2 Faulty battery open circuit 3 Faulty PCB Refer to trouble mode B Pilot lamp remains green red fails to light after battery has been connected 1 Poor connection of T or S terminal 2 Faulty PCB Refer to trouble mode C Pilot lamp indicates abnormality by flashing red rapidly at 0 2 second intervals 1 Battery connected in reverse direction 2 Faulty battery short circuit or open circuit 3 Faulty PCB Refer to trouble mode D 10 2 Troubleshooting and Repair Procedures 1 Trouble mode A Pilot lamp fails to light or flash Check with tester Is rated voltage applied to the plug Is there Continuity between the blades of the AC cord plug Apply rated voltage Is there an open circuit in the AC cord Faulty internal circuit YES Is the fuse 4 Replace PCB the primary side Blown P NO e Replace the fuse Y YES Replace the AC cord Faulty internal circuit y CL Replace PCB p 16 2 Trouble mode Red pilot lamp does not stay III continues to flash after battery has been connected Are the connection terminals of the charger or the battery dirty deformed or otherwise abnormal YE
18. n fully charged it will cause a large amount of oxygen gas O to be generated in a short period of time as shown below This proportionately accelerates degradation of the plates The A V microcomputer control system was adopted for the Model UC 24YFA charger in order to stop charging immediately before the battery is fully charged thereby avoiding the generation of oxygen gas This charging method applies no stress to the batteries Up to full charge Charging Oxygen gas is generated Enters overcharge state and proceeds almost without when full charge is reached begins gas degradation with the deviation Anode is fully charged cathode Charged portion E 7 4 Uncharged portion Plates What is the difference between the V microcomputer control system and the dT dt system A3 Both systems cut off charging at almost the same point before the battery becomes fully charged The A V microcomputer control system detects a sudden voltage change which occurs just before 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 V microcomputer control system and those charged with dT dt microcomputer control system 4 The dT dt microcomputer control system may have a slightly sho
19. ng protection systems for longer battery and charger life 70 minutes Easy to read visual display of charging status through constant lighting or flashing of red and green pilot lamps Fig 1 4 1 Selling Point Descriptions 4 1 1 Capable of handling both nickel cadmium Ni Cd and nickel metal hydride Ni MH batteries Through application of HITACHI microcomputer and electronic circuit control technology Model UC 24YFA is capable of handling both Ni Cd and Ni MH batteries 4 1 2 Rapidly charges all Hitachi EB series batteries Recharging time for 2 0 Ah battery has been reduced to approx 50 minutes and 3 0 Ah battery to approx 70 minutes Table 1 shows the charging time for each battery Table1 Recharging time approx min at 20 C Battery Battery capacity Ah voltage yapacan V 1 3 Ah 1 4 Ah 1 7 Ah 2 0 Ah 2 2 Ah 2 4 Ah 3 0 Ah EB7 35 min 7 2 V maj l45mn ER EB7S EB9 35 min EB9B in i in EB930H_ 70 min 96V min t EB9G 45 min 50 min EB9H 55 min EB924 60 min EB9S EB9M 12V EB12 35min EB12G 45min EB12B 0 min EB12H 55 min EB1224 60 EB1230H 70 min EB12S EB12M 14 4V EB14S 35 min 1414 40 min EB14B 50 min EB14H 55 min 681424 60 min EB1430H 70 min EB182 18V EB1814 40 min 82 50min EB1830H 70 min EB18B 24 V E
20. ns EB 7S EB 7G EB 9S EB 9G EB 9B 5 C 60 C Green pilot lamp lights When battery EB 9M EB 924 EB 12S EB 12G EB 12B temperature is reduced to 60 EB 12M EB 1224 EB 14S EB 1414 EB 14B green pilot lamp goes OFF and EB 1424 EB 1814 EB 18B EB 1820 EB 24B charging begins EB 9H EB 930H 0 C 45 C Green pilot lamp lights When battery EB 12H EB 1230H EB 14H EB 1430H EB 1830H EB 2430H temperature is reduced to 45 C green pilot lamp goes OFF and charging begins 5 SPECIFICATIONS 5 1 Specifications Item Descriptions Power source AC single phase 50 Hz or 60 Hz Power input 90W Charging system Constant current charge with feedback control Overcharging protection system 1 Battery voltage detection AV system for Ni Cd battery Ni MH battery temperature detection dT dt system for Ni MH battery 2 Battery surface temperature detection thermostat or thermistor 3 120 minutes timer temperature range Charging voltage 7 2 24V Charging current 2 5A Charging time Approx 50 minutes for 2 0 Ah Product weight 0 6 kg ient Operating ambien 0 C 40 C 5 2 Comparisons with Similar Products HITACHI UC 24YFA Charging time min 50 50 2 0 Ah 2 0 Ah Charging voltage V 7 2 24 7 2 24 Charging current A 2 5 2 5 Power input 90 90 Operating ambient C 0
21. ould result in fire or other hazards Instruct the customer to bring the charger to an authorized service center in the event repair or replacement is necessary 6 2 Extra Precautions Sales Promotion The following points must be given during sales promotion 6 2 1 Charging may not be possible when the battery temperature is high Charging may not be possible if the temperature of the battery is high after it has been exposed to direct sunlight for a long time or immediately after it has been used The customer should be advised in such a case to place the battery in a shaded area with good airflow and allow sufficient cooling before recharging 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 charger Inadvertently inserting a battery into the charger in the reverse direction will not only make it impossible to charge the battery it can also cause such damage as deformed terminals on the charger and the battery Customers should be advised to confirm that the battery terminals are correctly aligned before inserting the battery into the charger 6 2 3 B 2 7 2 V and B 3 9 6 V batteries
22. rter charging capacity approx to 5 96 However the amount of work possible per charge varies widely depending on the ambient temperature the efficiency with which the battery charge is used etc so that there is essentially no difference between batteries charged with either system Q5 The battery charger is supposed to be used within a temperature range of 0 to 40 C What happens if it is used for charging at under 0 C or above 40 C A5 Attemperatures of under 0 C battery overcharge will occur resulting in damage to the battery plates because the plates may not function properly At temperatures over 40 C sufficient charging cannot be attained or the plates will be damaged and the recharging discharging cycles of the batteries will be reduced by half compared to low temperature charging even if the battery is fully recharged 11 Q6 What is the relationship between the upper limit of the chargeable temperature of the battery the battery charger A6 Relationships are indicated in the following table Ni Cd Battery Ni MH Battery EB 7 EB 7S EB 7G EB 14S EB 18B EB 9H EB 930H EB 2430H EB 9 95 9 EB9M EB 1414 EB 1814 EB 12H EB 1230H 12 EB 924 125 148 1820 14 1430 124 128 1424 248 1830H 12 1224 UC24YFA 40 C 60 C 60 C 60 45 C 45 C UC
23. ry is fully charged The dT dt system detects the point where the temperature rises suddenly and suspends charging to minimize the temperature rise Note 4 As shown in Fig 7 the pressure of gas generated after a battery has become fully charged rises rapidly to cause high temperature and high gas pressure that degrade the effectiveness of the battery If charging is allowed to continue the pressure of the gas will activate the safety valve in the battery and the electrolyte will begin leaking 4 1 6 Easy to read visual display of charging status through constant lighting or flashing of red and green pilot lamps Pilot lamp indications 0 5 ON 0 5 OFF Prior to charging Blinks Hm HH Hm N Red pilot lamp During charging Lights 210 SN cag remains lit or lashes Charging Bins 0 5 ON 0 5 sec OFF completed M Charging not Flickers 0 1 sec 0 1 sec OFF Battery or charger possible mmm is faulty i i N Charging not possible Green pilot bay Lights steve a because battery lamp is lit temperature _ temperature is too high Charging of heated high temperature batteries Battery Type tomparature Heated high temperature battery range during charging EB 7 EB 9 EB 12 5 C 40 C Green pilot lamp lights When battery temperature is reduced to 40 C green pilot lamp goes OFF and charging begi
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