Hitachi SJ Series User Manual page 610

Chapter 18
E020 Temperature error
Cooling fan rotation speed
reduction error
If the temperature of inverter gets high due to
deterioration of cooling ability resulted from
decrease in fan rotation speed, the inverter turns
OFF its output. Refer to E021 also.
Occurrence Estimated cause(s)
• A foreign object is stuck.
Cooling fan
stopped.
• It is the end of cooling
fan life.
• Cooling fan is
The cooling fan is
approaching the end of
working.
its life.
E021 Temperature error
When the temperature of inverter gets high, the
inverter turns OFF its output.
Occurrence Estimated cause(s)
• Carrier frequency is
high.
• There is clogging in the
fin.
Error occurred
during operation.
•
Used in high temperature
environment.
• Cooling of the surroundings
is insufficient.
• The formal installation
condition is not satisfied.
• The temperature
Error occurred
detector circuit broke
during stop.
down.
Exemplar measures to be taken
• If there is a foreign object stuck in the fan, the inverter may recover
by removing it.
• The cooling fan needs to be replaced.
• The cooling ability has been deteriorated. The cooling fan needs to
be replaced.
Exemplar measures to be taken
• The higher the carrier frequency is, the more the temperature inside
the inverter tends to increase. Lower the carrier frequency setting.
• The cooling ability is deteriorated. Cleaning the fin may improve the
situation.
• Enhancing the use environment or cooling environment may
improve the situation.
• Improper installation of the inverter may results in the inverter
failure. Install the inverter properly in accordance with the instruction
manual.
• The temperature detector circuit is broken down if the error is
generated consecutively even after a reset. A repair is required.
18-17
Tips/FAQ/Troubleshooting
E020
E021