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Precautions
!CAUTION
Do not touch the terminals while power is being supplied.
Doing so may occasionally result in minor injury due to
electric shock.
Do not allow pieces of metal, wire clippings, or fine
metallic shavings or filings from installation to enter the
product. Doing so may occasionally result in electric
shock, fire, or malfunction.
Do not use the product where subject to flammable or
explosive gas. Otherwise, minor injury from explosion
may occasionally occur.
Never disassemble, modify, or repair the product or touch
any of the internal parts. Minor electric shock, fire, or
malfunction may occasionally occur.
Loose screws may occasionally result in fire.
Tighten terminal screws to the specified torque of 0.54 to
0.55 N·m.
Set the parameters for the Temperature Monitoring Relay
so that they are appropriate for the system being
monitored. If they are not appropriate, unexpected
operation may occasionally result in equipment damage
or accidents.
Use the following procedure to make the Temperature
Monitoring Relay settings.
• Make settings for the Temperature Monitoring Relay so
that they are appropriate for the system being
monitored.
• Turn the power supply to the Temperature Monitoring
Relay OFF before setting the switches provided on the
side of the Temperature Monitoring Relay. The settings
made on the switches on the side of the Temperature
Monitoring Relay will be enabled when the power
supply is turned ON.
A malfunction in the Temperature Monitoring Relay may
occasionally make monitoring operations impossible and
prevent alarm outputs, resulting in property damage to
facilities and devices. Conduct periodic maintenance of
the Temperature Monitoring Relay. To maintain safety in
the event of malfunction of the Temperature Monitoring
Relay, take appropriate safety measures, such as
installing a monitoring device on a separate line.
If the output relay is used past its life expectancy, contact
fusing or burning may occasionally occur. Always
consider the application conditions and use the output
relay within its rated load and electrical life expectancy.
The life expectancy of output relays varies considerably
with switching capacity and switching conditions.
■ Precautions for Safe Use
1. Do not use or store the Temperature Monitoring Relay in the
following locations.
• Places subject to splashing liquid or oil atmosphere
• Places subject to direct radiant heat from heating equipment
• Outdoors or places subject to direct sunlight
• Places subject to dust or corrosive gas (in particular, sulfide gas
and ammonia gas)
• Places subject to intense temperature changes
• Places subject to icing and condensation
• Places subject to vibration and large shocks
2. Use and store the Temperature Monitoring Relay within the rated
temperature and humidity ranges.
3. Mount the Temperature Monitoring Relay in the correct direction.
4. Be sure to wire properly with correct polarity of terminals.
5. Do not wire the I/O terminals incorrectly.
6. Use this Temperature Monitoring Relay within the specifications
and ratings voltage and load.
7. Be sure to make the same settings for the temperature sensor
type and the Temperature Monitoring Relay input type.
8. When extending the thermocouple lead wires, always use
compensating conductors suitable for the type of thermocouple.
9. When extending the lead wires of the platinum resistance
thermometer, be sure to use wires that have low resistance (i.e., 5
Ω max. per wire) and keep the resistance of the three lead wires
the same.
10.Use the specified size of crimped terminals for wiring.
11.Do not wire the terminals that are not used.
12.Use a switch, relay, or other contact so that the power supply
voltage reaches the rated voltage within one second. If the
applied voltage is increased gradually, the power supply may not
be reset or malfunctions may occur.
13.Design the system (e.g., control panel) to allow for the 1 second
of delay required for the Temperature Monitoring Relay's output to
stabilize after the power is turned ON.
14.Approximately 30 minutes is required for the correct temperature
to be detected after turning the power supply to the Temperature
Monitoring Relay ON. Turn the power supply ON at least 30
minutes prior to actually starting monitoring.
15.To avoid inductive noise, keep the wiring for the Temperature
Monitoring Relay's terminal block away from power cables
carrying high voltages or large currents. Also, do not wire power
lines together with or parallel to Temperature Monitoring Relay
wiring. Using shielded cables and using separate conduits or
ducts is recommended.
16.Attach a surge suppressor or noise filter to peripheral devices that
generate noise (in particular, motors, transformers, solenoids,
magnetic coils or other equipment that have an inductance
component).
When a noise filter is used at the power supply, first check the
voltage or current, and attach the noise filter as close as possible
to the Temperature Monitoring Relay.
Allow as much space as possible between the Temperature
Monitoring Relay and devices that generate powerful high
frequencies (high-frequency welders, high-frequency sewing
machines, etc.) or surge.
17.Microwave interference may affect the Temperature Monitoring
Relay. Do not use a microwave receiver near the Temperature
Monitoring Relay.
18.A switch or circuit breaker should be provided close to this unit.
The switch or circuit breaker should be within easy reach of the
operator, and must be marked as a disconnecting means for this
unit.
19.Do not use paint thinner or similar chemical to clean with. Use
standard grade alcohol.
20.Use tools when separating parts for disposal. Contact with the
sharp internal parts may cause injury.
21.Install the Temperature Monitoring Relay inside another device.
Temperature Monitoring Relay
K8AB-TH
7
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