Hitachi UC 18YFL, 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), nickel metal hydride (Ni-MH), SUPER nickel metal
hydride (SUPER Ni-MH) and litium ion (Li-ion) batteries
Thanks to the application of HITACHI's microcomputer and electronic-circuit control technology, the Model
UC 18YRL/UC 18YFL is capable of handling Ni-Cd, Ni-MH, SUPER nickel metal hydride (SUPER Ni-MH) and
lithium-ion (Li-ion) batteries.
4-1-2. Recharging/discharging cycles of battery (ambient temperature range between 10 û C and 30 û C)
• Ni-Cd battery: about 1,000 times • SUPER Ni-NH: about 1,500 times
• Ni-MH battery: about 500 times • Li-ion: about 1,500 times
Recharging/discharging cycles of Ni-Cd, Ni-MH and SUPER Ni-MH 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 detail.) When recharging a lithium-ion battery, the Model UC 18YRL/UC 18YFL can detect the
decrease in charging current (stop current) and stop recharging automatically.
4-1-3. Capable of recharging batteries with internal temperatures as high as 60 û C
Each nickel cadmium (Ni-Cd) battery shown in Figs. 2 and 3 incorporates a thermistor. The Models UC 18YRL
and UC 18YFL can continue recharging these batteries until the battery temperature reaches 60 û C.
(Note 1) • Wiring diagrams for batteries are shown below.
• The thermistor is an element to detect the battery temperature.
• The 95 û C thermal protector incorporated in each 14.4 V and 18 V battery interrupts the recharging
circuit when the battery temperature reaches 95 û C.
• The discriminating resistor is incorporated to distinguish Ni-Cd batteries from other batteries.
• Because the nickel metal hydride (Ni-MH), SUPER nickel metal hydride (SUPER Ni-MH) and
lithium-ion (Li-ion) batteries are heated to high temperatures during recharging, this charger
operates within a range of 10 û C temperature difference between the maximum battery temperature
when starting recharging (45 û C) and the temperature when stopping recharging (55 û C).
Thermistor
Fig. 2 Ni-Cd batteries (7.2 to 12 V)
Thermostat
terminal
+
terminal
S
terminal
--
Thermistor
95 û C thermal protector
terminal
--
terminal
+
terminal
--
terminal
S
(Terminal positions) (Terminal positions)
Fig. 3 Ni-Cd batteries (14.4 V, 18 V)
terminal
T