99
4. Output mode setting
The output mode can be set with the
switches on the side of the counter.
Make the DIP switch settings before
installing the counter on the panel.
5. Conditions of usage
1) Avoid locations subject to flammable
or corrosive gases, excessive dust, oil,
vibrations, or excessive shocks.
2) Since the cover of the unit is made of
polycarbonate resin, avoid contact with
or use in environments containing methyl
alcohol, benzene, thinners, and other
organic solvents; and ammonia, caustic
sodas, and other alkaline substances.
3) If power supply surges exceed the val-
ues given below, the internal circuits may
become damaged. Be sure to use surge
absorbing element to prevent this from
happening.
DIP
4) Regarding external noise, the values
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)
Rise time: 1 ns
Pulse width: 1 µs, 50 ns
Polarity: ±
Cycle: 100 cycles/second
5) When connecting the operation power
supply, make sure that no leakage cur-
rent enters the counter. For example,
when performing contact protection, if
set up like that of diagram A, leaking cur-
rent will pass through C and R, enter the
unit, and cause incorrect operation.
Diagram B shows the correct setup.
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
the unit for such continuous operation,
use in conjunction with a relay as shown
in the circuit in the diagram below.
• Surge wave form
[± (1.2
×
50) ms uni-polar full wave voltage]
Operating voltage Surge voltage (peak value)
AC type
6,000V
DC type
24V AC type
Power supply terminals
Input
terminals
AC type
DC type
24V AC type
Noise
voltage
1,500V
1,000V
600V
1,000V
Peak value
0
0
1.2
50
30
50
90
100
Time (
µ
s)
Surge voltage (%)
C
C
C
R
(Fig. A)
(Fig. B)
Operation power supply
Leakage current
R
C
Operation power supply
R
R
C
C
R
R
Relay
Counter
Receive output
from contact
at relay R
Load’s
power supply
Inductive load
LC4H counter
Diode rating:
I
F
(forward current): 1 A
V
R
(reverse voltage): 600 V
device, use a single-phase or double-
phase insulated power transformer. The
second-phase side must not be ground-
ed.
4) Since the power supply circuitry does
not contain a transformer, be aware that
it is not possible for simultaneous input
from an input contact point or transistor
to a LC4H counter with independent
power supply operation.
5) The input signal is applied by the
shorting of each input terminal with the
common terminal (terminal 1 for 8-pin
type, terminal 3 for 11-pin type and ter-
minal 6 for screw-down terminal types).
Never connect other terminals or volt-
ages higher than DC 40 V, because it
may destroy the internal circuitry.
6) Transistor output
(1) Since the transistor output is insulated
from the internal circuitry by a photo-
coupler, it can be used as an NPN out-
put or PNP (equal value) output. (The
above example is 11-pin type)
(2) Use the diode connected to the out-
Load
Load’s power supply
LC4H counter
{
O
I
As NPN output
Load
Load’s power supply
LC4H counter
As PNP output
{
O
I
LC4H counter
Input
terminals
Circuit
Rectifier circuits
Power
supply
Insulated transformer
is necessary
put transistor’s collector for absorbing
the reverse voltage from induced loads.
(LC4H only)
7) When wiring, use shielded wires or
metallic wire tubes, and keep the wire
lengths as short as possible.
Note: With the LC4H 8-pin type and the LC4H-W,
there is no diode between points
I
and
O
.
02/2003
