Hitachi UC 14YFA, Technical Data And Service Manual

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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 14YFA is
capable of handling both Ni-Cd and Ni-MH batteries.
4-1-2. 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
Recharging/discharging cycles of batteries can be dramatically increased by stopping recharging just before the
overcharging range by means of the system or the dT/dt system. (Refer to 4-1-4 for details.)
4-1-3. Capable of recharging batteries with internal temperatures as high as 60 ˚C
Each nickel cadmium (Ni-Cd) battery shown in Figs. 2 and 3 incorporates a thermistor. The Model UC 14YFA can
continue recharging these batteries until the battery temperature reaches 60 ˚C.
(Note 1) • Wiring diagrams for batteries are shown below.
• 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 are heated to high temperatures during
recharging, this charger operates within a range of 10˚C temperature difference between the
maximum battery temperature when starting recharging (45 ˚C) and the temperature when stopping
recharging (55 ˚C).
Thermistor
Fig. 2 Ni-Cd batteries (7.2 to 12 V)
Thermostat
Terminal
+
Terminal
S
Terminal
--
Thermistor
95 ˚C Thermal protector
Terminal
--
Terminal
+
Terminal
--
Terminal S
(Terminal positions) (Terminal positions)
Fig. 3 Ni-Cd batteries (14.4 V)
(Terminal positions)
(Terminal positions)
Fig. 4 Ni-MH batteries (9.6 to 12 V)
Terminal
T
Fig. 5 Ni-MH batteries (14.4 V)
Terminal
+
Terminal
S
Terminal
--
Thermistor
Discriminating
resistor
Terminal
--
Terminal
+
Terminal
S
Terminal
--
Terminal
T
95 ˚C Thermal protector
Terminal
T
Thermistor
Discriminating
resistor