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Refer to the Precautions section for each Digital Panel Indicator for specific precautions applicable to each Digital Panel Indicator.

Electrocution may possibly occur. Never touch terminals when the power is ON. During operation, be sure that all terminal covers are attached to models for which terminal covers are included.

Serious injury, significant property damage, or a serious accident resulting from abnormal operation may possibly occur. Never use the product on a network without a protective circuit. Provide double or triple safety measures, including emergency stop circuits, interlock circuits, and limit circuits, in external control circuits to ensure safety in the entire system if an abnormality occurs due to malfunction of the product or another external factor affecting the product's operation.

Minor electric shock, fire, or malfunction may occasionally occur. Do not allow pieces of metal, wire, or fine metal shavings or filings from installation work to enter the product.

Moderate or minor injury or property damage resulting from explosion may occasionally occur. Do not use the product in locations where flammable or explosive gases are present.

Do not use the K3HB-X for measurements within Measurement Categories III, or IV (according to IEC 61010-1), and do not use the K3HB-S, K3HB-V, K3HBH, K3HB-R, K3HB-P, K3HB-C, K3MA-J, K3MA-L, K3MA-F, or K3GN for measurements within Measurement Categories II, III, or IV (according to IEC 61010-1). Otherwise, unexpected operation, resulting in minor or moderate injury, or damage to the equipment may occasionally occur. Use the equipment for measurements only within the Measurement Category for which the product is designed.

Minor or moderate injury, or damage to equipment resulting from unexpected operation may occasionally occur. Do not operate the product if the settings of the product do not match the application. Be sure to make the correct the settings according to the application.

Property damage to equipment or facilities connected to the product may occasionally occur if the comparative outputs cease to operate resulting from product failure. Do not operate the product unless measures, such as installing a separate monitoring system, have been taken to ensure safety.

Minor or moderate injury, or damage to equipment resulting from fire may occasionally occur if screws become loose. Do not operate the product unless the screws on the terminal block and the connector locking screws have been tightened securely using a tightening torque within the following ranges.
Terminal block screws:
0.74 to 0.90 N・m for M3.5 screws,
0.43 to 0.58 N・m for M3 screws
Confirm the designated torque for connector locking screws for each specific model.

Minor or moderate injury, or damage to equipment resulting from unexpected operation following changes to online edit programs may occasionally occur. Do not operate the product unless it has been confirmed that no adverse effects will result even if the DeviceNet cycle time is extended.

Minor or moderate injury, or damage to equipment resulting from unexpected operation may occasionally occur when transferring a program to another node or changing the contents of the I/O memory. Do not perform either of these operations without confirming safety at the destination node.

Minor or moderate injury resulting from electric shock may occasionally occur. Do not attempt to disassemble, repair, or modify the product.

Precautions for Safe Use

1. Do not use the product in the following locations:

• Locations subject to direct radiant heat from heating equipment
• Locations where the product may come into contact with water or oil
• Outdoor locations or locations subject to direct sunlight
• Locations where dust or corrosive gases (in particular, sulfuric or ammonia gas) are present
• Locations subject to extreme temperature changes
• Locations where icing or condensation may occur
• Locations subject to excessive shocks or vibration

2. Do not use the product in locations subject to temperatures or humidity levels outside the specified ranges or in locations prone to condensation. If the product is installed in a panel, ensure that the temperature around the product (not the temperature around the panel) does not go outside the specified range.

3. Provide sufficient space around the product for heat dissipation.

4. Heat generated by the product itself can raise its interior temperature and shorten its service life. Do not install multiple products side-by-side or stacked one on top of the other. If this kind of installation cannot be avoided, provide the products with forced cooling, such as that using fans.

5. The service life of the output relays depends on the switching capacity and switching conditions. Consider the actual application conditions and use the product within the rated load and electrical service life. Using the product beyond its service life may result in contact welding or burning.

6. Install the product horizontally.

7. Install each product on a designated panel of the recommended thickness.

8. When using crimp terminals or bare conductor connections, use the parts and materials that are designated for each model.

Bare conductor connectionSheath
Power supplyOther than power
K3HB Series
K3MA Series
M3, width of
5.8 mm max.
AWG22 to AWG14
(cross-sectional area:
0.326 to 2.081 mm2)
AWG28 to AWG16
(cross-sectional area:
0.081 to 1.309 mm2)
6 to 8 mm

9. To prevent inductive noise, wire the lines connected to the product separately from power lines carrying high voltages or currents. Do not wire in parallel with or in the same cable as power lines. Other measures for reducing noise include running lines along separate ducts and using shielded wires.

10.Make sure that the rated voltage is achieved within 2 s after turning ON the power.

11.Allow the product to warm up for at least 15 minutes after the power is turned ON.

12.Do not install the product near devices generating strong highfrequency waves or surges. When using a noise filter, check the voltage and current and install it as close to the product as possible.

13.Do not use thinner to clean the product. Use commercially available alcohol for cleaning.

14.Be sure to confirm the name and polarity for each terminal before wiring the terminal block and connectors.

15.Use the product within the specified supply voltage and rated load.

16.Do not connect anything to unused terminals.

17.Outputs turn OFF when the mode is changed or settings are initialized. Take this into consideration when setting up the control system.

18.Install and provide proper indications for a switch or circuit breaker that complies with the requirements of IEC 60947-1 and IEC 60947-3 to enable the operator to quickly turn OFF the power.

19.Provide a DeviceNet communications distance that satisfies the range given in the specifications, and use the designated communications cable. For cable details, refer to the DeviceNet Catalog (Cat. No. Q102).

20.Do not bend or pull the DeviceNet communications cable with excessive force.

21.Do not attach or remove connectors with the DeviceNet power turned ON. Doing so may cause product failure or malfunction.

22.Use wire that is capable of withstanding heat of 70°C min. to wire the K3HB series.

Precautions for Correct Use

Countermeasures Against Noise

1. 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.

2. Install surge absorbers or noise filters on nearby devices that generate noise (particularly motors, transformers, solenoids, magnet coils, and other devices that have a high inductive component).

3. 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. It is also effective to separate the conduits and ducts, or use shielded cables.

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.

4. When using a noise filter for the power supply, check the voltage and current and install the filter as close as possible to the Digital Panel Indicator.

5. Do not install the product near radios, television sets, or wireless devices. Doing so may cause reception interference.

Water Resistance

Products that have no specified degree of protection and IP[]0 models are not waterproof.