Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 626

Specifications
■Special coating
Using the MR-J4 series in an atmosphere containing a corrosive gas may cause its corrosion with time, resulting in a
malfunction. For the printed circuit board of the servo amplifiers with a special coating specification, a urethane coating agent
is applied to some parts capable of being coated technically (except LEDs, connectors, terminal blocks, etc.) to improve the
resistance to corrosive gases. Use a servo amplifier with a special coating specification specifically for applications
susceptible to corrosive gases, including tire manufacturing and water treatment. Although the special coating-specification
products have the improved resistance to corrosive gases, proper operations in environments mentioned above are not
guaranteed. Therefore, perform periodic inspections for any abnormality.
■Standard for corrosive gases
In IEC 60721-3-3, corrosive gases refer to sea salt, sulfur dioxide, hydrogen sulfide, chlorine, hydrogen chloride, hydrogen
fluoride, ammonia, ozone, and nitrogen oxides shown in the environmental parameter column of the table below.
The table also shows the corrosive gas concentrations defined in IEC 60721-3-3, Class 3C2.
Environmental parameter
a) Sea salt
b) Sulfur dioxide
c) Hydrogen sulfide
d) Chlorine
e) Hydrogen chloride
f) Hydrogen fluoride
g) Ammonia
h) Ozone
i) Nitrogen oxides
The special coating-specification products have the improved corrosion resistance in environments with corrosive gas
concentrations conforming to IEC 60721-3-3, Class 3C2. We tested typical models and confirmed that their corrosive gas
resistance was improved, compared with the standard models.
APPX
624
Appendix 10 Special specification
Unit
None
3 3
cm /m
3 3
cm /m
3 3
cm /m
3 3
cm /m
3 3
cm /m
3 3
cm /m
3 3
cm /m
3 3
cm /m
3C2
Mean value
Salt mist
0.11
0.071
0.034
0.066
0.012
1.4
0.025
0.26
Maximum value
0.37
0.36
0.1
0.33
0.036
4.2
0.05
0.52