Omron K3MA-L Manual page 15

K3MA-L
Precautions
!Caution
Do not touch the terminals while the power is being supplied.
Doing so may result in electric shock.
!Caution
Do not disassemble the product or touch the internal compo-
nents of the product while the power is being supplied. Doing
so may result in electric shock.
!Caution
Do not allow pieces of metal or wire clippings to enter the prod-
uct. Doing so may result in electric shock, fire, or malfunction.
!Caution
Perform correct settings for the product according to the control
application. Failure to do so may cause unexpected operation,
resulting in damage to the product or injury.
!Caution
Take safety measures, such as installing a separate monitoring
system, to ensure safety even if the product fails. Product fail-
ure may prevent comparative outputs from being generated,
resulting in serious accidents.
Observe the following precautions to ensure safety.
1. Maintain the power supply voltage within the range speci-
fied in the specifications.
2. Maintain the load within the ratings specified in the specifi-
cations.
3. Check each terminal for correct number and polarity before
connecting it. Incorrect or reverse connections may dam-
age or burn out internal components in the product.
4. Tighten the terminal screws securely. The recommended
tightening torque is 0.43 to 0.58 N
cause fire or malfunction.
5. Do not connect anything to unused terminals.
6. Provide a switch or circuit breaker so that operators can
easily turn OFF the power supply when necessary. Also
provide appropriate indications of such devices.
7. Do not attempt to disassemble, repair, or modify the prod-
uct.
8. Do not use the product where flammable or combustible
gases are present.
Application
General Precautions
1. Do not use the product in the following locations:
• Locations subject to direct radiant heat from heating
equipment.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to direct sunlight.
• Locations subject to dust or corrosive gases (particularly,
sulfuric gas or ammonia gas).
• Locations subject to severe changes in temperature.
• Locations subject to icing or condensation.
• Locations subject to shock or vibration.
2. Do not block heat dissipation around the product, i.e., pro-
vide sufficient space for heat dissipation.
3. Ensure that the rated voltage is reached within two seconds
after the power is turned ON.
4. Conduct aging for 15 minutes min. after power is turned ON
for correct measurement.
Mounting
• Mount the product to a panel that is 1 to 8 mm thick.
• Install the product in a horizontal position.
• Use crimp terminals that match screw sizes.
Noise Prevention
• Install the product as far as possible from devices that generate
• Install surge absorbers or noise filters on nearby devices that
• To prevent inductive noise, separate the terminal block wiring for
¼
m. Loose screws may
• When using a noise filter for the power supply, check for the volt-
• Do not install the product near radios, television sets, or wireless
Increasing Service Life
• Do not use the product in locations where the temperature or hu-
• Use and store the product within the temperature and humidity
• The life of the output relays are greatly affected by the switching
5. Do not touch the slit sections or terminals while the power
is being supplied to prevent the product from being affected
by static electricity.
6. Do not lay heavy objects on the product during use or stor-
age. Doing so may deform or deteriorate the product.
7. Do not use paint thinner for cleaning. Use commercially
available alcohol.
strong, high-frequency fields (such as high-frequency welders or
sewing machines) or surges.
generate noise (particularly motors, transformers, solenoids,
magnet coils, and other devices that have a high inductance
component). Do not connect a surge absorber to the tempera-
ture sensor input section of the K3MA-L.
Line filter
Power
Tempera-
supply
ture Meter
input
the product from high-voltage or high-current power lines. Do not
route the wiring for the product in parallel with or tie it in a bundle
with power lines.
Take the following countermeasures against inductive noise in
input lines.
Temperature Inputs
Separate the lead wire that connects the product with a temperature
sensor from the load line to prevent the product from being affected by
inductive noise.
age and current and install it as close as possible to the Temper-
ature Meter.
devices. Doing so may cause reception interference.
midity exceeds the ratings or where condensation may occur.
When installing the product in a panel, be sure that the temper-
ature around the product (not the temperature around the panel)
does not exceed the ratings. The product service life depends on
the ambient temperature. The higher the ambient temperature,
the shorter the service life. To extend the product service life,
lower the temperature inside the Temperature Meter.
ranges given in the specifications. When gang-mounting Tem-
perature Meters or arranging them vertically, heat generated by
the Temperature Meters will cause the internal temperature to
rise, reducing the service life. In such cases, consider forced
cooling methods, such as using a fan to circulate air around the
Temperature Meters. Do not, however, allow only the terminals
to be cooled. Doing so will increase measurement error.
capacity and switching conditions. Use these relays within their
rated load and electrical life. The contacts may fuse or burn if
they are used past their electrical life.
K3MA-L
+
Tempera-
Power
ture Meter
supply
Signal
input
input
−
Surge absorber
15