Safety Precautions
viii © Copyright Reserved Autonics Co., Ltd.
Pollution Degree 2
Installation Category II
Sensor Input
If using in an environment where the margin of sensor error cannot be avoided, use
the Input Bias feature to minimize the error margin.
If using a thermocouple sensor, make sure to use prescribed compensation wire as
extension wire. Failure to do so will produce temperature distortion at the junction
between the thermocouple and the extension wire.
If using a resistance temperature detector (RTD) sensor, always make connection
with three-wire configuration. In addition, only use three wires of identical material,
thickness and length if you need to extend the line. Variance in wire resistance will
lead to temperature distortion.
When changing an input sensor, first disconnect power to the product and then
connect the new sensor. Restore power to the product and update the related
parameters either directly from the product or using the PC loader program.
Always use a line filter on the controller's power line. Also, use shielded wire for the
input signal line, provided it is necessary the power line and the input signal line must
remain close to one another.
Noise Effect
Isolate the product's wiring from high-voltage lines and power lines to prevent impulse
noise.
Avoid using the product in the vicinity of high-frequency noise generating devices.
Such as: welding machines, sewing machines, high-capacity SCR controllers, and
high-capacity motors.
Avoid using the product in the vicinity of radio, television, and wireless devices that
may cause high-frequency interference.
Communication
Only use twisted pair wires for the communication lines. Attach round ferrules at the
ends of the lines to reduce the impact of external noise.
Do not have the communication lines in close proximity to the AC power line.
If possible, use a separate power source (24 VDC) for the communication converter
(SCM-38I, sold separately).
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