H7AN
17
Safety Precautions
Refer to Safety Precautions for All Counters.
Minor injury due to electric shock may occasionally
occur. Do not touch any of the terminals while power
is being supplied.
Minor injury due to electric shock may occasionally
occur. Do not touch the terminals for at least 1 minute
after turning OFF the power supply.
Minor injury due to explosion may occasionally occur.
Do not use the H7AN where subject to flammable or
explosive gas.
Minor electric shock, fire, or malfunction may
occasionally occur. Never attempt to disassemble,
modify, or repair the H7AN or touch any of the internal
parts.
If the output relay is used beyond its life expectancy,
its contacts may become fused or there may be a risk
of fire.
Use the output relay within its rated load and
electrical life expectancy. The life expectancy of the output relay
varies considerably according to its usage.
Fire may occasionally occur. Tighten the terminal
screws to a torque of 0.74 to 0.90 N·m.
Do not allow metal fragments, lead wire scraps, or
chips from processing during installation to fall
inside the H7AN. Otherwise, minor electric shock, fire
or malfunction may occasionally occur.
■Precautions for Safe Use
•The H7AN is not waterproof or oil resistant. Do not use it in
locations subject to water or oil.
•The load current must be within the rated current.
•Pay careful attention to polarity to avoid wrong connections when
wiring the counter input terminals and reset input terminal.
•Do not apply directly apply an external voltage to either the
transistor output terminals or external power supply terminals.
•When using heaters, be sure to use a thermal switch for the load
circuit.
•Use a switch, relay, or other contact device so that the power is
turned ON or OFF quickly. If the power supply voltage is not
reached quickly enough, the H7AN may malfunction.
•Use the specified wires for wiring.
Applicable Wires:
AWG24 to AWG18 (cross-sectional area of 0.205 to 0.823 mm2)
•Do not connect more than two crimp terminals to the same
terminal.
•Do not connect anything to unused terminals.
•Leaving the H7AN with outputs ON at a high temperature for a long
time may hasten the degradation of internal parts (such as
electrolytic capacitors). Therefore, use the product in combination
with relays and avoid leaving the product with the output turned ON
for a long period of time (e.g., a month or more).
•The set value of the Preset Counter can be changed at any time
during operation and the new set value will be used immediately.
The output will turn ON whenever the set value equals the current
count, so change the set value with care. (If a setting switch is
accidentally touched during operation, the set value will be
changed and the new set value will be used for operation. Always
leave the front panel cover closed unless you are changing a
setting.)
•When removing the Counter body from the case, never touch the
terminals or electronic components with your hands or subject
them to shock. When inserting the body, do not allow electronic
components to come in contact with the case.
•Static electricity may destroy internal components. When removing
the Counter body from the case, do not touch an electronic
components other than the setting switches with your hands.
•When changing the set value during operation, do not leave a
switch set so that two numbers are visible at the same time. The set
value will not be accurate. Push the buttons on the thumbwheel
switches firmly.
■Precautions for Correct Use
•Inrush current of approximately 23 A will flow for a short period of
time when the power supply is turned ON. If the capacity of the
power supply is insufficient, the H7AN may not start. Use a power
supply, breakers, an contacts with sufficient capacity.
•After turning ON the power supply, 50 ms is required for the internal
circuits to reach the operating voltage. Operation for input signals
may not be correctly during this time.
•After turning OFF the power supply, 50 ms is required for voltage in
the internal circuits to drop. Operation may be performed for input
signals during this time.
•Operation after the power supply is interrupted with be as shown
below for models without data backup and for models that back up
data for power interruptions (models with model numbers ending in
“-M”).
Note: Use a model with a backup function (models ending in “-M”) to
maintain the settings even for power interruptions. Be sure to
enable the backup function.
!CAUTION
CP1
11
10
CP2
9
Reset
30 VDC max.
8
V
Polarity not
reversible
H7AN
12
13
14
8or
or
or
External
power
supply
Unstable operation
Power
Possible
ON
OFF
50 m
Reception of
input signal
50 ms
Power ON
OFF
Momentary
power interruption
Operation after
power interruption
0.5 s or more All reset
0.01 s or less The counter continues normal operation
same as before the power failure.
More than 0.01 and less than 0.5 s The counter may reset or continue operating.