Problems And Measures When Using Inverter; Environment And Installation Condition - Mitsubishi Electric FATEC FR-A800 Manual

7
REVIEW OF INSTALLATION ENVIRONMENT
7.3

Problems and measures when using inverter

This section explains the reliability and life of the inverter and important precautions depending on
the installation environment of the inverter and the operating condition.
In addition, the circuit design, precautions on wiring, and operating procedure for using an inverter
are explained as well.
7.3.1

Environment and installation condition

(1) Reliability of the inverter and temperature
The reliability of the inverter is significantly influenced by the temperature. High surrounding air
temperature or incorrect installation may cause unexpected troubles such as failures and
damages due to the increased temperature inside the inverter which is installed in an undesired
place or not installed correctly.
The possible causes are shown below.
Surrounding air
temperature High
Temperature inside
the inverter High
(2) Surrounding air temperature
Surrounding air temperature of the inverter is the temperature at the immediate periphery of the
position where the inverter is installed.
1) Measure the temperature at the position shown in Fig. 7.28.
2) The permissible temperature range is from -10°C to +50°C.
(Too high or low temperature causes a trouble.)
3) When the temperature inside the enclosure is +50°C or lower,
consider that the surrounding air temperature of the enclosure
is 40°C or lower.
7.3 Problems and measures when using inverter
116
Cause examples
Stagnation of heat in the enclosure
Heat dissipation effect of an enclosure is small.
(Due to its small dimensions,
insufficient ventilation, or others)
Air duct of the inverter is narrow.
Installation position of the inverter is not proper.
Heating element is placed near the inverter.
Installation direction of the inverter is not proper.
The space above the inverter is small.
Failure of the inverter fan
5 cm 5 cm
5 cm
Fig. 7.28 Measuring the
surrounding air temperature