6. PRECAUTIONS IN SALES PROMOTION ..................19 6-1. Safety Instructions ..........................19 6-2. Extra Precautions in Sales Promotion ....................20 7. QUESTIONS AND ANSWERS ON MODEL UC 24YJ ..............21 8. GENERAL PRECAUTIONS ......................24 8-1. Model UC 24YJ ..........................24 8-2. Wiring Diagram ..........................25 8-3.
The new Model UC 24YJ is a general-purpose rapid charger that has been developed based on the current Model UC 24YC to meet the market demand. The Model UC 24YJ can charge batteries from 7.2 V to 24 V in shorter times than the current Model UC 24YC.
4. SELLING POINTS Capable of charging batteries at low temperatures rapidly (The charging time required for recharging a battery at a temperature of -5˚C is shortened from 2.5 hours to 40 minutes.) Charging time indicator lamp indicates the time Capable of charging conventional up to completion of charging in 3 steps (remaining 7.2 V to 24 V batteries charging time can be seen at a glance).
4-1-1. Capable of charging batteries at low temperatures rapidly The Model UC 24YJ can charge a battery at a temperature of 5˚C or less. At first, the battery is charged at a low charging current. When the battery gets warm (over 5˚C), the charging current turns high. Thus a battery at a low temperature can be rapidly charged.
Refer to "5-3-7. Revitalizing the battery (trickle charging)" on page 16 for details. 4-1-4. Capable of charging conventional 7.2 V to 24 V batteries The Model UC 24YJ can charge conventional 7.2 V to 24 V batteries thanks to the charging controller. --- 4 ---...
Product weight 1.0 kg Operating ambient temperature range 0 ˚C to 40 ˚C 5-2. Comparisons with Similar Products HITACHI Maker • Model Item Unit UC 24YJ Ni-MH (Inserting type) (Inserting type) (Inserting type) Battery type Ni-Cd (Inserting type) (Inserting type)
(switching) the control switch at high frequency (see Fig. 2). The Model UC 24YJ is also equipped with this system, however, the high frequency may cause noise in a television or a radio. To prevent this noise problem, avoid connecting the Model UC 24YJ to the same receptacle where a television or a radio is connected.
The Model UC 24YJ always stops charging just before the overcharge range. Thus the charging/ discharging cycles of a battery is increased.
(2) Forcefully stops charging by means of battery internal temperature sensor: As shown in Figs. 4 and 5, each of the applicable batteries is equipped with a built-in thermistor or thermostat to detect the battery temperature. Charging is stopped when the battery reaches the charging stop temperature even if the battery is not fully charged.
Models UC 24YJ, UC 24YC, UC 24YFA, UC 24YF, UC 12YE, UC 12YD and UC 12YB Thermal protector (The charging circuit is interrupted when Thermostat the battery temperature is about 80˚C.) Thermistor (Models UC 12Y Thermistor and UC 12YA) Terminal...
(3) Forcefully stops charging by means of timer: Should overcharge protection system, dT/dt overcharge protection system and battery surface temperature sensor fail, the timer stops charging. 5-3-3. Discrimination of batteries A discriminating resistor is provided in each Ni-MH battery to distinguish from Ni-Cd batteries as shown in Fig. 5. 5-3-4.
5-3-6. Switching the charging current The charging current is switched according to the temperature of the battery or the charger as described in (1) to (6) below (see Figs. 7 to 12). (1) 7.2 V to 24 V Ni-Cd batteries The charging current is switched (9 A/7.5 A/6 A/1.3 A) according to the battery temperature at the start of charging.
Relationship between temperature of battery/charger and charging current Temperature Charging current Purpose Battery temperature at the start of 7.5 A charging is between -5˚C and 55˚C. Battery temperature at the start of charging 1.3 A (*) Protection of the battery is -5˚C or less.
(4) 7.2 V to 14.4 V Ni-MH batteries The charging current is switched (9 A/6 A/4 A/1.3 A) according to the battery temperature at the start of charging. Therefore, the charging time changes as shown in Fig. 10. (Min.) Charging time Charging current (mean value) (Note) Battery temperature at the start of charging...
(5) 18 V Ni-MH battery The charging current is switched (7.5 A/6 A/5 A/4 A/1.3 A) according to the battery temperature at the start of charging. Therefore, the charging time changes as shown in Fig. 11. (Min.) Charging time Charging current (mean value) (Note) Battery temperature at the start of charging In the case of 3.0 Ah Ni-MH battery Model EB 1830H...
(6) 24 V Ni-MH battery The charging current is switched (6 A/4 A/1.3 A) according to the battery temperature at the start of charging. Therefore, the charging time changes as shown in Fig. 12. (Min.) Charging time Charging current (mean value) (Note) Battery temperature at the start of charging In the case of 3.0 Ah Ni-MH battery Model EB 2430H...
(No.) 6 A (5 A) range Switching boundary 9 A range Ambient temperature Fig. 13 Time required to switch from 9 A to 6 A (5 A) 5-3-7. Revitalizing the battery (trickle charging) This is a function to charge a battery further after completion of charging as shown in Fig. 14 (repeats the following cycle 10 times: 1-hour pause and 15-minute charging at 1.3 A).
5-3-8. Safety device The Model UC 24YJ is equipped with a safety device that stops charging (and extinguishes the lamp) if any of the following troubles occurs. The electrolyte adheres to the thermistor built in the battery. The battery temperature cannot be detected correctly in this case.
5-4-2. Serial numbers of batteries The serial number of a battery is indicated on the name plate or marked on the upper case of the battery. Indication on the name plate of the battery The numeral indicated at the serial number column means the last digit of the production year and the number of dots (total of 12) means the production month.
6-1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model UC 24YJ 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.
(1) Because the shape of the B-2 (7.2 V) battery is different from others, it cannot be connected to the Model UC 24YJ. (2) Even if the B-3 (9.6 V) battery is connected to the Model UC 24YJ 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 24YJ Q1 What are typical charging methods? A1 The most recent electronic charging methods are outlined below. Method A Method B UC 12Y UC 24YJ UC 12YA UC 24YC UC 24YF UC 14YF2...
) to be generated in a short period of time, as shown below. This proportionately accelerates degradation of the plates. microcomputer control system was adopted for the Model UC 24YJ charger in order to stop charging immediately before the battery is fully charged, thereby avoiding the generation of oxygen gas.
8. GENERAL PRECAUTIONS 8-1. Model UC 24YJ (1) The outer frame is composed of case (A) and case (B). A circuit board is built in. (2) The prism is mounted to case (A). (3) The terminal for charging, high-frequency transformer for power supply, microcomputer for control, IC, etc. are mounted on the circuit board.
8-2. Wiring Diagram Case (B) ass'y (circuit board) Terminal for charging TAB terminal AC cord 5 A fuse Varistor 8-3. Pilot Lamp Indications Refer to "5-3-4. Lamp indications" on page 10 for details. --- 25 ---...
9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The [Bold] numbers in the descriptions below correspond to the item numbers in the Model UC 24YJ Parts List and exploded assembly diagram. 9-1. Disassembly Remove the four Tapping Screws (W/Flange) D3 x 20 , and separate Case (B) Ass'y  and Case (A) .
10. TROUBLESHOOTING GUIDE 10-1. Troubleshooting Based on Pilot Lamp Indications Phenomenon Typical cause Checking procedure The charge time lamp and the (1) Faulty AC cord Refer to trouble mode (A). charge status lamp fail to light. (2) Blown fuse (5 A) on primary side (3) Life of relay in case (B) ass'y (circuit board ass'y) ended.
(2) Trouble mode (B) The charge time lamp does not light red or orange or green continuously or does not flash red when a battery is inserted. The charge status lamp flashes rapidly (in 0.2-second intervals) when a battery is inserted.