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5. Leakage current
1) For connecting operating voltage to
the counter, a circuit should be used,
which will prevent the flow of leakage
current. For example, a circuit for con-
tact protection as shown in Fig A. will
permit leakage current flow through R
and C, causing erroneous operation of
the counter. Instead, the circuit shown in
Fig. B should be used.
2) If the counter
is directly
switched with a
non-contact ele-
ment, leak cur-
rent may flow
into the counter
and cause it to
malfunction.
Cautions for use
(common for all models)
1. Terminal connections
Correctly connect the pins while seeing
the terminal layout/wiring diagram. In
particular, the DC type, which has polari-
ties, does not operate with the polarities
connected reverse. Any incorrect con-
nection can cause abnormal heating or
ignition.
2. Connection to operating voltage
1)Apply the entire supply voltage through
a switch, relay or other contact.
2) The operating voltage for the DC type
must be at the specified ripple percent-
age or less. The average voltage must
fall within the allowable operating voltage
range.
5. Superimposed surge of power
supply
For the superimposed surge of power
supply, the standard waveform (±1.2 ×
50µs or ±1 × 40µs) is taken as the stan-
dard value for surge-proof voltage. (The
positive and negative voltages are
applied each three or five times between
the power pins.)
For the standard values for the LC4H
type counters, see the respective items
in "Cautions for use."
• Single-pole, full-wave voltage for surge
waveform [±(1.2 × 50) µs]
If external surge occurs exceeding the
specified value, the internal circuit may
break down. In this case, use a surge
absorption element. The typical surge
absorption elements include a varistor, a
capacitor, and a diode. If a surge
absorption element is used, use an oscil-
loscope to see whether or not the foreign
surge exceeding the specified value
appears.
6. Signal input
The counter's signal input comes in two
ways. One is by opening and closing the
input terminal. The other is by applying a
specified H-level or L-level voltage to the
input terminal.
For an input sensor's residual voltage,
input impedance, input voltage level and
other signal input conditions, see the rat-
ings for each type of product.
7. Operating environment
1) For the ambient operating tempera-
ture and humidity, see the ratings for
each type of product.
2) Avoid using the counter in a location
where inflammable or corrosive gas is
generated, the counter is exposed to
much dust and other foreign matter; water
or oil is splashed on the counter; or vibra-
tions or shocks are given to the counter.
3) The counter cover (case), the knobs,
and the dials are made of polycarbonat-
ed resin. Therefore, prevent the counter
from being exposed to organic solvents
such as methyl alcohol, benzine, and
thinner, strong acid substances such as
caustic soda, and ammonia and avoid
using the counter in atmosphere contain-
ing any of those substances.
4) If the counter is used where noises
are emitted frequently, separate the input
signal elements (such as a sensor), the
wiring for the input signal line, and the
counter as far as possible from the noise
source and the high power line contain-
ing noises.
8. Checking the actual load
In order to increase the reliability in the
actual use, check the quality of the
counter in the actual usage.
9. Others
1) If the counter is used exceeding the
ratings (operating voltage and control
capacity), the contact life, or any other
specified limit, abnormal heat, smoke, or
ignition may occur.
2) The LC2H series counter, incorpo-
rates a lithium battery.
Never disassemble the lithium battery or
throw it into fire because this may affect
humans and facilities. The lithium bat-
tery must be disposed of as an incom-
bustible like other used batteries.
3) If any malfunction of the counter is
likely to affect human life and properties,
give allowance to the rated values and
performance values. In addition, take
appropriate safety measures such as a
duplex circuit from the viewpoint of prod-
uct liabilities.
3) Make sure that no induced voltage
and residual voltage are applied between
the power terminals on the counter after
the power switch is turned OFF.
(If the power line is wired in parallel with
the high-voltage and motor lines,
induced voltage may be produced
between the power pins.)
3. Control output
1) Keep the load capacity below the
counter's rated control capacity. If used
above the rating, the counter's service
life may shorten. With the transistor out-
put type counters, transistors may be
damaged.
4. Installing the counter
1) To install the counter, use the dedicat-
ed pin bracket or socket (cap). Avoid
connecting the pins on the counter by
directly soldering them.
2) In order to maintain the characteris-
tics, do not remove the counter cover
(case).
As remote as possible
Power line
,
etc.
Counter
Input line
Sensor
,
etc.
Rectification type Ripple percentage
Single-phase, full-wave Approx. 48%
Three-phase, full-wave Approx. 4%
Three-phase, half-wave Approx. 17%
Counter
C
Counter
(
Fig. A
)
Leakage current
RC
C
(
Fig. B
)
R
C
Operating
voltage
Operating
voltage
Peak value
Time
(
µs
)
90
100
50
30
0
Surge voltage
(
%
)
0 1.2 50
PRECAUTIONS IN USING THE COUNTER
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net