Panasonic HL-C2 Series, User Manual, Page: 12 / 278

Preface
10
Warming Up Time
Allow at least 30 minutes of warming up after turning on the power to ensure
the performance of the product.
Measures to Noise
• Install the product as far away as possible from noise source such as
high-voltage lines, high-voltage device, power lines, power device,
machines which generate a large starting and stopping surge, welding
machines and inverter motor.
• Install the product as far away as possible from wireless device that has a
transmitter such as amateur radio device.
• The LCD display breaks if excessive static electricity is applied on the panel
surface of compact programmable display.
• Do not roll up the sensor cable (bundle in parallel) with other wirings. Keep
it at least 100mm away from other wires. Cables should be separated from
high voltage and power circuit lines. If it is unavoidable, shield it by
running through a conductive material such as grounded electrical conduit.
• For input signal lines and output signal lines, run them separately, not rolled
up with the power line and power supply line. Keep them at least 100 mm
apart. All signal lines should be connected as short as possible.
• Analog output is affected if a large amount of electrical noise arises in the
power supply. In this case, use a noise filter or a noise dampened
transformer.
• For signal lines for RS-232C or for I/O terminals, use shielded cables and
connect the shielding wire to the frame ground (F.G.) to reduce electric
noise.
• Analog outputs is likely to be influenced by noise, especially by external
noise. Use shielded wires and wire them as short as possible.
• Use an exclusive class D frame ground and avoid sharing the ground with
other devices. This may produce an opposite effect.
Insulation Resistance and Voltage Resistance
Do not conduct insulation resistance tests and voltage resistance tests among
the power supply, I/O signals, metal parts of the controller and sensor head.