Fuji Electric FRENIC-AQUA series, User Manual

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9.3 If an Alarm Code Appears on the Monitor
9-7
Chap. 9
TROUBL
ESH
OOTING
[ 6 ] OPL Output phase loss
Problem Output phase loss occurred.
Possible Causes What to Check and Suggested Measures
(1) Inverter output wires are
broken.
Measure the output current.
Î Replace the output wires.
(2) The motor winding is broken. Measure the output current.
Î Replace the motor.
(3) The terminal screws for inverter
output were not tight enough.
Check if any screws on the inverter output terminals have become
loose.
Î Tighten the terminal screws to the recommended torque.
(4) A single-phase motor has been
connected.
Î Single-phase motors cannot be used. Note that the FRENIC-AQUA
only drives three-phase induction motors.
[ 7 ] OH1 Heat sink overheat
Problem Temperature around heat sink has risen abnormally.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the inverter
exceeded the inverter's
specification range.
Measure the temperature around the inverter.
Î Lower the temperature around the inverter (e.g., ventilate the panel
where the inverter is mounted).
Check if there is sufficient clearance around the inverter.
Î
Change the mounting place to ensure the clearance.
(2) Ventilation path is blocked.
Check if the heat sink is not clogged.
Î Clean the heat sink.
Check the cumulative run time of the cooling fan. (See Chapter 5,
Section “5.6.4.4 Viewing Maintenance Information”.)
Î
Replace the cooling fan.
(3) Cooling fan's airflow volume
decreased due to the service life
expired or failure.
Visually check whether the cooling fan rotates normally.
Î Replace the cooling fan.
(4) Overload. Measure the output current.
Î Reduce the load (e.g. Use the heat sink overheat early warning (E20
through E27) or the overload early warning (E34) and reduce the
load before the overload protection is activated.).
Î Decease the motor sound (carrier frequency) (F26).
Î
Enable the overload prevention control (H70).