LH2H Hour Meter
3
Non-voltage input type
• Never apply voltage to the non-voltage input type. This
will damage the internal elements.
•Since the current ow is very small from the start input
and reset input terminals ( and on panel mounting
type and to and to on PC board mounting
type) please use relays and switches with high contact
reliability. When inputting with an open collector of a
transistor, use a transistor for small signals in which ICBO
is 1 μA or less and always input with no voltage.
• When wiring, try to keep all the input lines to the start and
reset inputs as short as possible and avoid running them
together with high voltage and power transmission lines
or in a power conduit. Also, malfunctions might occur if
the oating capacitance of these wires exceeds 500 pF
(10 m 32.808 ft. for parallel wires of 2 mm2). In particular,
when using shielded wiring, be careful of the capacitance
between wires.
Voltage input type
• Be aware that applying more than 30 V DC to start input
terminals and , and reset input terminals and
will cause damage to the internal elements.
•For external resetting use H level (application of 4.5 to
30 V DC) between reset terminals and of the rear
terminals. In this case, connect + to terminal and – to
terminal . This is the valid polarity; therefore, the hour
meter will not work if reversed.
• When wiring, try to keep all the input lines to the start and
reset inputs as short as possible and avoid running them
together with high voltage and power transmission lines
or in a power conduit. Also, malfunctions might occur if
the oating capacitance of these wires exceeds 500 pF
(10 m 32.808 ft. for parallel wires of 2 mm2).
Backlight luminance
To prevent varying luminance among backlights when using
multiple backlight types, please use the same backlight
power supply.
Terminal connection
Tighten the terminal screws with a torque of 0.8 N·m or
less.
Free voltage input type
How to reset multiple panel mounting type counters all
at once (input is the same for count)
• Use start input terminals and for free voltage input
and reset input terminals and for non-voltage input.
•Be aware that the application of voltage that exceeds the
voltage range of the H level to the start input terminal,
and the application of voltage to the reset input terminal,
can cause damage to the internal elements.
•Since the current ow is very small from reset input
terminal , please use relays and switches with high
contact reliability.
• When inputting a reset with an open collector of a
transistor, use a transistor for small signals in which ICBO
is 1 μA or less and always input with no voltage.
•To reset externally, short reset input terminals and
on the rear.
• Input uses a high impedance circuit; therefore, erroneous
operation may occur if the inuence of induction voltage
is present. If you plan to use wiring for the input signal
that is 10 m 32.808 ft. or longer (wire capacitance 120
pF/m at normal temperature), we recommend the use of
a CR lter or the connection of a bleeder resistor.
PC board mounting type
For both panel mounting and PC board mounting types
Non-voltage input type
Voltage input type
•For external power supply use manganese dioxide or
lithium batteries (CR type: 3 V).
•Always reset after external power is applied and conrm
that the display reads “0”.
• Make the wiring from the battery to the hour meter unit as
short as absolutely possible. Also, be careful of polarity.
• Calculate battery life with the following formula.
t = A/I
t: battery life [h]
I: LH2H current consumption [mA]
A: battery capacity until minimum
operation voltage is reached [mAh]
• Hand solder to the lead terminal. Do not dip solder. With
the tip of the soldering iron at 300
°C
572 °F perform
soldering within 3 seconds (for 30 to 60 W soldering iron).
Notes: 1) Use the following as a guide for choosing transistors used for
input (Tr).
Leakage current < 1 μA
2) Use as small a diode (D) as possible in the forward voltage so
that the voltage between terminals 3 and 4 during reset input
meets the standard value (0.5 V). (At IF = 20 μA, forward
voltage: Max. 0.1 V)
Note: Make sure that H (reset ON) level is at least 4.5 V.
3or
DTr
4 3 4 3 4
D D
3or
R
Tr
4 3 4 3 4 3 4
22
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CAUTIONS FOR USE
