K-54
Temperature Meter
K3MA-L
Precautions
!WARNING
Do not touch any of the terminals while the power is being sup-
plied. Doing so may result in electric shock.
!Caution
Do not disassemble the product or touch the internal components
of the product while the power is being supplied. Doing so may re-
sult in electric shock.
!Caution
Do not allow metal objects or wire cuttings to enter the product.
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, re-
sulting 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 failure
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 specified in
the specifications.
2.
Maintain the load within the ratings specified in the specifications.
3.
Check each terminal for correct number and polarity before con-
necting it. Incorrect or reverse connections may damage or burn
out internal components in the product.
4.
Tighten the terminal screws securely. The recommended tighten-
ing torque is 0.43 to 0.58 N
⋅
m. Loose screws may 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 appro-
priate indications of such devices.
7.
Do not attempt to disassemble, repair, or modify the product.
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 equip-
ment.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to direct sunlight.
• Locations subject to dust or corrosive gases (particularly, sul-
furic 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., provide suf-
ficient 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.
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 storage.
Doing so may deform or deteriorate the product.
7.
Do not use paint thinner for cleaning. Use commercially available
alcohol.
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
strong, high-frequency fields (such as high-frequency welders or
sewing machines) or surges.
•
Install surge absorbers or noise filters on nearby devices that gen-
erate noise (particularly motors, transformers, solenoids, magnet
coils, and other devices that have a high inductance component).
Do not connect a surge absorber to the temperature sensor input
section of the K3MA-L.
•
To prevent inductive noise, separate the terminal block wiring for
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 tempera-
ture sensor from the load line to prevent the product from being
affected by inductive noise.
•
When using a noise filter for the power supply, check for the voltage
and current and install it as close as possible to the Temperature
Meter.
•
Do not install the product near radios, television sets, or wireless
devices. Doing so may cause reception interference.
Increasing Service Life
•
Do not use the product in locations where the temperature or
humidity exceeds the ratings or where condensation may occur.
When installing the product in a panel, be sure that the temperature
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.
•
Use and store the product within the temperature and humidity
ranges given in the specifications. When gang-mounting Tempera-
ture 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 Tempera-
ture Meters. Do not, however, allow only the terminals to be cooled.
Doing so will increase measurement error.
•
The life of the output relays are greatly affected by the switching
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.
+
−
Line filter
Power
supply
input
Tempera-
ture Meter
Signal
input
Tempera-
ture Meter
Power
supply
input
Surge absorber
