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PRECAUTIONS IN USING THE LC4H SERIES
6. Self-diagnosis function
If a malfunction occurs, one of the following displays will appear.
Display
or
Contents
Minimum value went below –999
or –99999. See note 1.
Incorrect DIP switch setting.
Malfunctioning CPU.
Malfunctioning memory. See
note 2.
Output condition
No change
OFF
Restoration procedure
Enter reset or RESET
key.
Restart unit (correct DIP
switch settings)
Enter reset, RESET key,
or restart unit.
Preset values after restoration
No change
The values at start-up before the CPU
malfunction occurred.
0
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.
7. Compliance with the CE marking
When using in applications to which
EN61812-1 applies, abide by the follow-
ing conditions.
? Overvoltage category II, pollution level
2
(for sensor type model with power sup-
ply)
1. Connections between the power sup-
ply and input/output have basic insula-
tion. Use a device with basic insulation
to connect to the I/O terminals.
(for sensor type model without power
supply)
1) This counter employs a power supply
without a transformer, so the power
and input signal terminals are not
insulated.
142
(1) When a sensor is connected to the
input circuit, install double insulation
on the sensor side.
(2) In the case of contact input, use dual-
insulated relays, etc.
? The load connected to the output con-
tact should have basic insulation.
This counter is protected with basic
insulation and can be double-insulated
to meet EN/IEC requirements by using
basic insulation on the load.
? Applied voltage should be protected
with an overcurrent protection device
(example: 250 V 1A fuse, etc.) that con-
forms to the EN/IEC standards.
2) You must use a terminal block or
socket for installing the pin-type
counter. Do not touch the terminal
section or other parts of the timer unit
while an electric current is applied.
Before installation or removal, confirm
that there is no voltage being applied
to any of the terminals.
3) Do not use this timer with a safety cir-
cuit. For example, when using a timer
in a heater circuit, etc., provide a pro-
tection circuit on the machine side.
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