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5.4 The Precautions on the Wiring
DANGER
z Completely turn off the externally supplied power used in the system when
installing or placing wiring. Not completely turning off all power could result
in electric shock, damage to the product.
CAUTION
z Be sure to ground the FG terminal and LG terminal of the GOT power
supply section to the protective ground conductor. Not doing so could
result in electric shock or erroneous operation.
z When wiring in the GOT power section, be sure that it is done correctly by
checking the product's rated voltage and the terminal layout. Connecting a
power supply that is different from the rating or incorrectly wiring the
product could result in fire or erroneous operation.
z Tighten the terminal screws of the GOT power supply section within the
specified torque range.
If the terminal screws are loose, it could result in short circuits, erroneous
operation or erroneous operation.
Tightening the terminal screws too far may cause damages to the screws
and/or the module, resulting in fallout, short circuits, or erroneous
operation.
z Be sure there are no foreign substances such as sawdust or wiring debris
inside the modle GOT main unit.
y General view of noise countermeasures
There are two types of noise: radiated noise, which is transmitted through
the air, and conducted noise, which is transmitted through a connection
wire. In noise countermeasures, the both two types of noise should be taken
into account. As the noise countermeasures, there are the following three
methods.
(1) Block noise
(a) Keep signal wires away from a possible noise source as power wires
or high-power driving circuits.
(b) Shield signal wires.
(2) Reduce generated noise
(a) Reduce the noise generated from high-power motor drive circuits.
(3) Ground noise without fail
(a) Earth the grounding wire to the ground without fail.
(b) Use a grounding wire as thick and short as possible to ensure low
grounding impedance.
(c) Separate the grounding between power and control systems.