Mitsubishi Electric FATEC FR-A800 Manual page 138

7
REVIEW OF INSTALLATION ENVIRONMENT
Failure example 1: Inverter failure due to leaking
[Failure]
An inverter in an enclosure installed outside stopped on a rainy day.
[Cause]
A short-circuit of the internal plate was found on the investigation of the inverter in the
enclosure. A detailed examination inside the enclosure revealed that rain had been trickled
from the accordion hose (for storing wires) to the inverter.
Failure example 2: Inverter failure due to foreign object
[Failure]
Nothing was displayed on the monitor (LED display) when power of the inverter in the
enclosure was turned on.
[Cause]
A short-circuit of the internal plate was found on the investigation of the inverter in the
enclosure. According to the enclosure manufacturer, additional processing associated with
the added upper pipe of the enclosure was performed after the inverter installation,
producing considerable cutting chips.
[Similar failure]
After the cables are bared with the stripper during processing, the cut chip touches the
inverter when the wire length is adjusted.
7.4 Precautions for storing an inverter in the enclosure
1
2
3
4
5
6
7
8
133