Mitsubishi Electric FR-F820-00077 Instruction Manual page 46

Installation of the inverter and enclosure design
● Measures against low temperature
– Provide a space heater in the enclosure.
– Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
● Sudden temperature changes
– Select an installation place where temperature does not change suddenly.
– Avoid installing the inverter near the air outlet of an air conditioner.
– If temperature changes are caused by opening/closing of a door, install the inverter away from
the door.
NOTE For the amount of heat generated by the inverter unit, refer to the Technical News (MF-Z-118)
contained in the enclosed CD-ROM.
Humidity
Operate the inverter within the ambient air humidity of usually 45 to 90% (up to 95% with circuit
board coating). Too high humidity will pose problems of reduced insulation and metal corrosion. On
the other hand, too low humidity may cause a spatial electrical breakdown.
The insulation distance defined in JEM1103 "Control Equipment Insulator" is humidity of 45 to 85%.
● Measures against high humidity
– Make the enclosure enclosed, and provide it with a hygroscopic agent.
– Provide dry air into the enclosure from outside.
– Provide a space heater in the enclosure.
● Measures against low humidity
Air with proper humidity can be blown into the enclosure from outside. Also when installing or
inspecting the unit, discharge your body (static electricity) beforehand, and keep your body away
from the parts and patterns.
● Measures against condensation
Condensation may occur if frequent operation stops change the in-enclosure temperature sud-
denly or if the outside air temperature changes suddenly.
Condensation causes such faults as reduced insulation and corrosion.
– Take the measures against high humidity.
– Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
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Installation and wiring