98
PRECAUTIONS DURING USAGE
1. Terminal wiring
1) When wiring the terminals, refer to the
terminal layout and wiring diagrams and
be sure to perform the wiring properly
without errors.
2) For embedded installation applica-
tions, the screw-down terminal type is
recommended.
Use either the rear terminal block (AT8-
RR) or the 8P cap (AD8-RC) for the 8-
pin type, and the 11P cap (AT8-DP11)
for the 11-pin type. Avoid soldering
directly to the round pins on the unit.
For front panel installation applications,
use the 11-pin type DIN rail terminal
block (ATC18004).
3) After turning the unit off, make sure
that any resulting induced voltage or
residual voltage is not applied to power
supply terminals
W
through
U
(8-pin
type),
W
through
P
(11-pin type) or
and
(screw-down terminal type). (If
the power supply wire is wired parallel to
the high voltage wire or power wire, an
induced voltage may be generated
between the power supply terminals.)
4) Have the power supply voltage pass
through a switch or relay so that it is
applied at one time. If the power supply
is applied gradually, the counting may
malfunction regardless of the settings,
the power supply reset may not function,
or other such unpredictable occurrence
may result.
2. Input connections
The power circuit has no transformer.
When an input signal is fed to two or
more counters at once, do not arrange
the power circuit in an independent way.
If the counter is powered on and off inde-
pendently as shown in Fig. A, the coun-
ter's internal circuitry may get
damaged.Be careful never to allow such cir-
cuitry. (Figs. A, B and C show the circuitry for
the 11-pin type.)
2
1
If independent power circuitry must be used,
keep the input contacts or transistors sepa-
rate from each other, as shown in Fig. B.
When power circuitry is not independent,
one input signal can be fed to two or
more counters at once, as shown in Fig. C.
3. Input and output
1) Signal input type
(1) Contact point input
Use highly reliable metal plated contacts.
Since the contact point’s bounce time
leads directly to error in the count value,
use contacts with as short a bounce time
as possible. In general, select Input 1
and Input 2 to have a maximum counting
speed of 30 Hz and to be reset with a
minimum input signal width of 20 ms.
(2) Non-contact point input
Connect with an open collector. Use
transistors whose characteristics satisfy
the criteria given below.
V
CEO
= 20 V min.
I
C
= 20 mA min.
I
CBO
= 6µA max.
Also, use transistors with a residual volt-
age of less than 2 V when the transistor
is on.
* The short-circuit impedance should be
11-pin type
Screw terminal type
3
4
5
6
7
8-pin type
1
—
5
4
3
6
7
8
9
10
Reset input
Input 1
Input 2
Lock
input
11-pin type
Screw terminal type
3
4
5
6
7
8-pin type
1
—
5
4
3
6
7
8
9
10
Reset input
12 to 40V DC
Q
(The above example is for reset input)
11-pin type
Screw terminal type
3
4
5
6
7
8-pin type
1
—
5
4
3
6
7
8
9
10
Reset input
Input 1
Input 2
Lock
input
LC4H series CAUTIONS FOR USE
10
2
3
(Fig. A)
Input contact
point or transistor
2
3
10
Power
supply
Input
terminal
terminal
Input
10
2
3
3
2
10
(Fig. B)
Input contact
point or transistor
Power
supply
point or transistor
Input contact
terminal
Input
terminal
Input
(Fig. C)
Power
supply
3
3
Input contact
point or transistor
10
2
10
2
terminal
Input
terminal
Input
less than 1 k
Ω
.
[When the impedance is 0 W, the current
coming from the input 1 and input 2 ter-
minals is approximately 12 mA, and from
the reset input and lock input terminals is
approximately 1.5 mA.]
Also, the open-circuit impedance should
be more than 100 k
Ω
.
* As shown in the diagram below, from a
non-contact point circuit (proximity
switches, photoelectric switches, etc.)
with a power supply voltage of between
12 and 40 V, the signal can be input
without using an open collector transis-
tor. In the case of the diagram below,
when the non-contact point transistor Q
switches from off to on (when the signal
voltage goes from high to low), the sig-
nal is input.
2) The input mode and output mode
change depending on the DIP switch set-
tings. Therefore, before making any con-
nections, be sure to confirm the opera-
tion mode and operation conditions cur-
rently set.
3) For the power supply of the input
Note: The LC4H-W does not have the lock input
R
.
7
Note: The LC4H-W does not have the lock input
R
.
7
02/2003
