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1.3
Precautions for safe use
Be sure to observe the following precautions to prevent operation failure, malfunction, or adverse
affects on the performance and functions of the product. Not doing so may occasionally result in
unexpected events. Do not handle the Digital Controller in ways that exceed the ratings.
• The product is designed for indoor use only. Do not use or store the product outdoors or in any of
the following places.
- Places directly subject to heat radiated from heating equipment.
- Places subject to splashing liquid or oil atmosphere.
- Places subject to direct sunlight.
- Places subject to dust or corrosive gas (in particular, sulfide gas and ammonia gas).
- Places subject to intense temperature change.
- Places subject to icing and condensation.
- Places subject to vibration and large shocks.
• Installing two or more controllers in close proximity might lead to increased internal temperature
and this might shorten the life cycle of electronic components. It is strongly recommended to
install cooling fans or other air-conditioning devices inside the control cabinet.
• Always check the terminal names and polarity and be sure to wire properly. Do not wire the
terminals that are not used.
• To avoid inductive noise, keep the controller wiring away from power cables that carry high voltages
or large currents. Also, do not wire power lines together with or parallel to Digital Controller
wiring. Using shielded cables and using separate conduits or ducts is recommended. 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 Digital Controller. Allow as much space as possible between
the Digital Controller and devices that generate powerful high frequencies (high-frequency
welders, high-frequency sewing machines, etc.) or surge.
• A switch or circuit breaker must be provided close to device. The switch or circuit breaker must be
within easy reach of the operator, and must be marked as a disconnecting means for the controller.
• The device must be protected by a fuse T1A, 250 VAC, time lag, low shut-off capacity.
• Wipe off any dirt from the Digital Controller with a soft dry cloth. Never use thinners, benzine, alcohol,
or any cleaners that contain these or other organic solvents. Deformation or discoloration may occur.
• The number of non-volatile memory write operations is limited. Therefore, use EEprom write mode
when frequently overwriting data, e.g.: through communications.
• Chemicals/solvents, cleaning agents and other liquids must not be used.
• Non-respect of these instructions may reduce performances and safety of the devices and cause
danger for people and property.
For CT (Current Transformer) input:
• Warning: To reduce risk of electric shock, always open or disconnect circuit from power-distribu-
tion system (or service) of building before installing or servicing current transformers
• For use with Listed Energy-Monitoring Current Transformers
• The current transformers may not be installed in equipment where they exceed 75 percent of the
wiring space of any cross-sectional area within the equipment
• Restrict installation of current transformer in an area where it would block ventilation openings
• Restrict installation of current transformer in an area of breaker arc venting
• Not suitable for Class 2 wiring methods
• Not intended for connection to Class 2 equipment
• Secure current transformer and route conductors so that the conductors do not directly contact
live terminals or bus.
6 - URDR001A - User manual
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