Omron E5GC User Manual page 10

Precautions for Safe Use
*2 The E5GC (models with screwless clamp terminal blocks) underwent UL testing with one stranded wire
connected.
• Do not wire the terminals that are not used.
• To avoid inductive noise, keep the wiring for the Digital Controller's terminal block 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.
• Use the Digital Controller within the rated load and power supply.
• Make sure that the rated voltage is attained within 2 seconds of turning ON the power using a switch
or relay contact. If the voltage is applied gradually, the power may not be reset or output malfunctions
may occur.
• Make sure that the Digital Controller has 30 minutes or more to warm up after turning ON the power
before starting actual control operations to ensure the correct temperature display.
• When executing self-tuning, turn ON power for the load (e.g., heater) at the same time as or before
supplying power to the Digital Controller. If power is turned ON for the Digital Controller before turning
ON power for the load, self-tuning will not be performed properly and optimum control will not be
achieved.
• A switch or circuit breaker must be provided close to Digital Controller. The switch or circuit breaker
must be within easy reach of the operator, and must be marked as a disconnecting means for Digital
Controller.
• 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.
• Design the system (e.g., control panel) considering the 2 seconds of delay in setting the Digital
Controller's output after the power supply is turned ON.
• The output will turn OFF when you move to the Initial Setting Level. Take this into consideration when
performing control.
• The number of non-volatile memory write operations is limited. Therefore, use RAM write mode when
frequently overwriting data, e.g., through communications.
• Always touch a grounded piece of metal before touching the Digital Controller to discharge static
electricity from your body.
• Use suitable tools when taking the Digital Controller apart for disposal. Sharp parts inside the Digital
Controller may cause injury.
• For compliance with Lloyd's standards, the E5CC, E5CC-U, E5CC-B, E5EC, E5EC-B, E5AC, and
E5DC must be installed under the conditions that are specified in Shipping Standards.
• On models with two Setup Tool ports (E5EC, E5EC-B, E5AC, E5DC, and E5GC), do not connect
cables to both ports at the same time. Damage or malfunction may occur.
• Do not exceed the communications distance that is given in the specifications and use the specified
communications cable.
• Do not turn the power supply to the Digital Controller ON or OFF while the USB-Serial Conversion
Cable is connected. The Digital Controller may malfunction.
• Do not bend the communications cables past their natural bending radius. Do not pull on the
communications cables.
• For the E5DC, when you attach the Main Unit to the Terminal Unit, make sure that the hooks on the
Main Unit are securely inserted into the Terminal Unit.
8 E5@C Digital Temperature Controllers User's Manual (H174)