Fuji Electric FRENIC-HVAC User Manual page 643

[ 8 ] OH2 External alarm
Problem External alarm was inputted (THR).
(when the "Enable external alarm trip" THR has been assigned to any of digital input terminals)
Possible Causes
(1) An alarm function of external
equipment was activated.
(2) Wrong connection or poor
contact in external alarm signal
wiring.
(3) Incorrect setting of function
code data.
[ 9 ] OH3 Inverter internal overheat
Problem Temperature inside the inverter has exceeded the allowable limit.
Possible Causes
(1) The ambient temperature
exceeded the inverter's
specification limit.
(2) The airflow generated by the
internal fan has dropped because
the fan lifetime has been reached
or because a fault has occurred.
(3) The power is turned ON too
often
[ 10 ] OH4 Motor protection (PTC thermistor)
Problem Temperature of the motor has risen abnormally.
Possible Causes
(1) The temperature around the
motor exceeded the motor's
specification range.
(2) Cooling system for the motor
defective.
(3) Overload.
9.3 If an Alarm Code Appears on the Monitor
What to Check and Suggested Measures
Check the operation of external equipment.
 Remove the cause of the alarm that occurred.
Check if the external alarm signal wiring is correctly connected to the
terminal to which the "Enable external alarm trip" terminal command
THR has been assigned (Any of E01 through E07, E98, and E99 should
be set to "9.").
 Connect the external alarm signal wire correctly.
Check whether the "Enable external alarm trip" terminal command
THR has been assigned to an unavailable terminal (with E01 through
E07, E98, or E99).
 Correct the assignment.
Check whether the normal/negative logic of the external signal matches
that of the THR command specified by any of E01 through E07, E98,
and E99.
 Ensure the matching of the normal/negative logic.
What to Check and Suggested Measures
Measure the ambient temperature.
 Lower the temperature around the inverter (e.g., ventilate the panel
where the inverter is mounted).
Visually check whether the internal fan is functioning normally.
 Replace the internal fan.
Reduce the number of times the power is turned ON/OFF (guide:
1/hour or less)
What to Check and Suggested Measures
Measure the temperature around the motor.
 Lower the temperature.
Check if the cooling system of the motor is operating normally.
 Repair or replace the cooling system of the motor.
Measure the output current.
 Reduce the load (e.g. Use the heat sink overheat early warning
(E01 through E09) or the overload early warning (E34) and reduce
the load before the overload protection is activated.). (In winter,
the load tends to increase.)
 Lower the temperature around the motor.
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