MELSEC iQ-F and MELSEC-F Series High-Altitude Precautions Technical Bulletin

This technical bulletin provides precautions for using MELSEC iQ-F and MELSEC-F series programmable controllers at altitudes above 2000 meters, where reduced atmospheric pressure decreases withstand voltage performance and heat dissipation. It includes correction factors for AC and DC withstand voltage at various altitudes, a formula for calculating reduced operating ambient temperature, and warnings about decreased noise immunity requiring external protection circuits.