Datasheet

9
LC4H Electronic Counter
3. 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
values given below, the internal circuits
may become damaged. Be sure to use
surge absorbing element to prevent this
from happening.
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 ms, 50 ns
Polarity: ±
Cycle: 100 cycles/second
5) When connecting the operation power
supply, make sure that no leakage
current enters the counter. For example,
when performing contact protection, if
set up like that of diagram A, leaking
current 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
weakening 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
• Surge wave form
[± (1.2 × 50) ms uni-polar full wave voltage]
Operating voltage
Display Contents
Minimum value went below –999
or –99999. See note 1.
Enter reset or RESET
key.
Restart unit (correct DIP
switch settings)
Enter reset, RESET key,
or restart unit.
No change
The values at start-up before the CPU
malfunction occurred.
0
Incorrect DIP switch setting.
Malfunctioning CPU.
Malfunctioning memory. See
note 2.
No change
OFF
Output condition Restoration procedure Preset values after restoration
Surge voltage (peak value)
AC type 6,000V
DC type
Power supply terminals
Input
terminals
AC type DC type
Noise
voltage
1,500V 1,000V 600V
1,000V
Peak value
0
0 1.2 50
30
50
90
100
Time (µs)
Surge voltage (%)
C
C
CR
(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
5. CE Marking Certification
1) EMC directive (89/336/EEC)
As a counter unit, the LC4H series
conforms to EMC directives. Applicable
standards are EN50081-2 and EN50082-
2.
2) Low voltage directive (73/23/EEC)
In order to satisfy VDE0435/Part 2021,
be sure to adhere to the following
installation conditions and precautions.
(1) The counter uses a non-transformer
power supply and the power supply and
input signal terminals are not insulated.
• When a sensor is connected to the
input circuit, install double insulation on
the sensor side.
• With contact-point inputting, use
double-insulated relays, etc.
(2) Always connect loads insulated with
basic insulation specifications to the
output contact points. The counter unit is
also insulated with basic insulation
specifications. The combination of the
two satisfies VDE, which calls for double
insulation.
(3) For the applied power supply, use
one protected by an over-current
protection device that conforms with
EN/IEC standards (i.e. 250 V, 1 A fuse).
(4) During installation, always use a
terminal block or the appropriate
sockets. Do not touch the terminals, or
other part of the counter unit while it is
on. Before installation or removal of the
unit, first verify that no voltage is being
applied to any of the terminals.
(5) Do not use the counter in a safety
circuit. When the unit is being used in a
circuit such as a heater circuit, install a
protection circuit on the machine side.
4. Self-diagnosis function
If a malfunction occurs, one of the following displays will appear.
Note 1: When the counter value goes below the minimum value during any of the subtraction, directive, independent, or phase input modes.
Note 2: Includes the possibility that the EEPROM’s life has expired.
or