Yamaha CEmarking RCX221, User Manual

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3-21
Chapter
3
INST
ALLA
TION
10. Precautions for cable routing and installation
10.2 Precautions for installation
This robot controller is not designed with an explosion-proof, dust-proof or drip-proof
structure. Do not install it in the following locations or environments
(1) where exposed to flammable gases or liquids.
(2) where conductive debris such as metal cutting chips are spread.
(3) where exposed to corrosive gases such as acid gases and alkaline gases.
(4) where exposed to cutting oil, grinding fluids and machining mist.
(5) near sources of electrical noise, such as large inverters, high-power high-frequency
generators, large switching devices, and welding machines.
10.3 Methods of preventing malfunctions
To prevent malfunctions due to noise, take into account the following points.
1) Place a noise filter and ferrite core at a point near the robot controller.
Do not bundle the primary wiring and secondary wiring of the noise filter together.
■
Bad example
Noise
filter
Robot
controller
Primary
wiring Secondary
wiring
L1
N1
L
N
Ground wire
• Primary wiring and secondary wiring of the noise filter are bundled together.
• Ground wire is bundled with primary wiring of the noise filter.
2) Always attach a surge absorber to the coil of inductive loads (inductive motor,
solenoid valve, brake solenoid and relay) located near the robot controller.
Example of surge absorber
■
For inductive motor
A: Surge killer (Okaya Electric Industries CRE-50500, 3CRE-50500 or equivalen
Single-
phase
motor
A
3-phase
motor
A
■
For solenoid valve, solenoid
B: Diode, varistor, CR elements
DC type
C: Varistor, CR elements
AC type
B C