Fuji Electric FRENIC-ECO, Instruction Manual

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6-12
The 208V inverters with a capacity of 50HP or above and the 460V inverters with a capacity of 75HP or
above each have a cooling fan/fans for heat sinks and a DC fan for internal air circulation (dispersing the
heat generated inside the inverter). For their locations, refer to Chapter 1, Section 1.2 “External View and
Terminal Blocks.”
[ 8 ]
0h2
Alarm issued by an external device
Problem External alarm was inputted (THR).
(in case external alarm (THR) is assigned to one of digital input terminals [X1] through [X5],
[FWD], or [REV])
Possible Causes What to Check and Suggested Measures
(1) An alarm function of the
external equipment was
activated.
Inspect external equipment operation.
Î Remove the cause of the alarm that occurred.
(2) Connection has been
performed incorrectly.
Check if the wire for the external alarm signal is correctly connected to the
terminal to which the "Alarm from external equipment" has been assigned
(Any of E01, E02, E03, E04, E05, E98, and E99 is set to "9.").
Î Connect the wire for the alarm signal correctly.
Check if the "Alarm from external equipment" has not been assigned to an
unassigned terminal assigned (E01, E02, E03, E04, E05, E98, or E99).
Î Correct the assignment.
(3) Incorrect settings.
Check whether the assignment (normal/negative logic) of the external signal
agrees with that of thermal command (THR) set by E01, E02, E03, E04, E05,
E98, and E99.
Î
Ensure that the polarity matches.
[ 9 ]
0h3
Inside of the inverter overheat
Problem The temperature inside the inverter exceeded the allowable limit.
Possible Causes What to Check and Suggested Measures
(1) The ambient temperature
exceeded the allowable
limit specified for the
inverter.
Measure the ambient temperature.
Î Lower the ambient temperature by improving the ventilation.
[ 10 ]
0h4
Motor protection (PTC thermistor)
Problem Temperature of the motor rose abnormally.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the
motor exceeded that of
motor specifications.
Measure the temperature around the motor.
Î Lower the temperature.
(2) Cooling system for the
motor malfunctioned.
Check if the cooling system of the motor is operating normally.
Î Repair or replace the cooling system of the motor.
(3) Load was too heavy. Measure the output current.
Î Lighten the load (e.g., lighten the load before overload occurs using the
overload early warning (E34) function) (In winter, the load tends to
increase.).
Î Lower the temperature around the motor.
Î
Increase the motor sound (carrier frequency) (F26).