Mitsubishi Electric FATEC FR-A800 Manual page 126

7
REVIEW OF INSTALLATION ENVIRONMENT
● Temperature
(a) Countermeasures against high temperature
1) Use a forced ventilation system or similar cooling system. (Refer to (4).)
2) Install the enclosure in an air-conditioned electric chamber.
3) Block direct sunlight.
4) Provide a shielding plate or similar plate to avoid direct exposure to the radiated heat and
wind of a heat source.
5) Ventilate the area around the enclosure well.
(b) Countermeasures against low temperature
1) Provide a space heater in the enclosure.
2) Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
(c) Sudden temperature changes
1) Select an installation place where temperature does not change suddenly.
2) Avoid installing the inverter near the air outlet of an air conditioner.
3) If temperature changes are caused by opening/closing of a door, install the inverter away
from the door.
● Humidity
Operate the inverter within the ambient air humidity range of 45 to 90% (up to 95% with circuit
board coating). If the humidity is too high, problems such as the reduced insulation and metal
corrosion occur. On the other hand, too low humidity may cause a spatial electrical breakdown.
The humidity conditions for the insulation distance defined in JEM 1103 standard "Insulation
Distance from Control Equipment" is 45 to 85%.
(a) Countermeasures against high humidity
1) Make the enclosure enclosed, and provide a hygroscopic agent.
2) Provide dry air into the enclosure from outside.
3) Provide a space heater in the enclosure.
(b) Countermeasures 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.
(c) Countermeasures against condensation
Condensation may occur if frequent operation stops change the in-enclosure temperature
suddenly or if the outside air temperature changes suddenly.
Condensation causes faults such as reduced insulation and corrosion.
1) Take the countermeasures against high humidity described in (a).
2) Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
7.3 Problems and measures when using inverter
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