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PRECAUTIONS IN USING THE LC4H SERIES
3) The LC4H series use power supply
without a transformer (power and input
As NPN output
LC4H counter
? Surge wave form
[± (1.2 × 50) ms uni-polar full wave voltage]
terminals are not insulated). In connect-
ing various kinds of input signals, there-
{
O
I
100
90
fore, use a power transformer in which
Load
the primary side is separated from the
ungrounded secondary side as shown in
Fig. A, for the power supply for a sensor
Load’s power supply
50
30
Peak value
and other input devices so that short-cir-
cuiting can be prevented.
Once the wiring to be used is completely
As PNP output
LC4H counter
{ O
I
0
0
1.2
Time ( μ s)
50
installed and prior to installing this
counter, confirm that there is complete
insulation between the wires connected
to the power terminals (2 each) and the
wires connected to each input terminal. If
the power and input lines are not insulat-
Load
Load’s power supply
Note: With the LC4H 8-pin type and the LC4H-W,
there is no diode between points I and O .
below are considered the noise-resistant
voltages. If voltages rise above these
values, malfunctions or damage to the
internal circuitry may result, so take the
necessary precautions.
Noise wave form (noise simulator)
ed, a short-circuit may occur inside the
counter and result in internal damage.
In addition, when moving your equipment
(2) Use the diode connected to the out-
put transistor’s collector for absorbing
the reverse voltage from induced loads.
Power supply terminals
DC type
AC type
24V AC type
Input
terminals
to a new installation location, confirm
that there is no difference in environmen-
tal conditions as compared to the previ-
(LC4H only)
LC4H counter
Noise
1,500V
voltage
Rise time: 1 ns
1,000V
600V
ous location.
(except LC4H-S/AC type)
Pulse width: 1 μs, 50 ns
Polarity: ±
(Fig. A) Good example
Diode rating:
Inductive load
Cycle: 100 cycles/second
5) When connecting the operation power
AC power supply
Insulation transformer
(+)
(–)
Input device
(e.g., sensor)
I F (forward current): 1 A
V R (reverse voltage): 600 V
Load’s
power supply
supply, make sure that no leakage cur-
rent enters the counter. For example,
when performing contact protection, if
Counter
(–)
6) When wiring, use shielded wires or
metallic wire tubes, and keep the wire
set up like that of diagram A, leaking cur-
rent will pass through C and R, enter the
(Fig. B) Bad example
lengths as short as possible.
unit, and cause incorrect operation.
Diagram B shows the correct setup.
AC power supply
4. Output mode setting
Insulation transformer
(+)
Input device
The output mode can be set with the DIP
(–)
(e.g., sensor)
switches on the side of the counter.
Leakage current
Make the DIP switch settings before
Counter
(–)
installing the counter on the panel.
Operation power supply
R
C
C
5. Conditions of usage
AC power supply
1) Avoid locations subject to flammable
Single coil transformer
(+)
(–)
Input device
(e.g., sensor)
or corrosive gases, excessive dust, oil,
vibrations, or excessive shocks.
(Fig. A)
2) Since the cover of the unit is made of
Counter
(–)
Alternative
current flow
polycarbonate resin, avoid contact with
or use in environments containing methyl
alcohol, benzene, thinners, and other
R
4) The input signal is applied by the
shorting of each input terminal with the
common terminal (terminal Q for 8-pin
organic solvents; and ammonia, caustic
sodas, and other alkaline substances.
3) If power supply surges exceed the val-
Operation power supply
C
C
type, terminal E for 11-pin type and ter-
ues given below, the internal circuits may
minal 6 for screw terminal types). Never
connect other terminals or voltages high-
er than 40 V DC , because it may
destroy the internal circuitry.
5) Transistor output
(1) Since the transistor output is insulat-
ed from the internal circuitry by a pho-
become damaged. Be sure to use surge
absorbing element to prevent this from
happening.
4) Regarding external noise, the values
Operating voltage Surge voltage (peak value)
AC type 6,000V
(Fig. B)
6) Long periods of continuous operation
in the count-up completed condition (one
month or more) will result in the weaken-
ing of the internal electrical components
from the generated heat and, therefore,
should be avoided. If you do plan to use
tocoupler, it can be used as an NPN
output or PNP (equal value) output.
(The above example is 11-pin type)
DC type
24V AC type
1,000V
the unit for such continuous operation,
use in conjunction with a relay as shown
in the circuit in the diagram below.
R
C
R
R
R
Relay
C
Counter
Receive output
from contact
at relay R
141
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