Fuji Electric FRENIC-HVAC User Manual page 642

[ 6 ] OPL Output phase loss
Problem Output phase loss occurred.
Possible Causes
(1) Inverter output wires are
broken.
(2) The motor winding is broken.
(3) The terminal screws for inverter
output were not tight enough.
(4) A single-phase motor has been
connected.
[ 7 ] OH1 Heat sink overheat
Problem Temperature around heat sink has risen abnormally.
Possible Causes
(1) Temperature around the inverter
exceeded the inverter's
specification range.
(2) Ventilation path is blocked.
(3) Cooling fan's airflow volume
decreased due to the service life
expired or failure.
(4) Overload.
What to Check and Suggested Measures
Measure the output current.
 Replace the output wires.
Measure the output current.
 Replace the motor.
Check if any screws on the inverter output terminals have become
loose.
 Tighten the terminal screws to the recommended torque.
 Single-phase motors cannot be used. Note that the
FRENIC-HVAC/AQUA only drives three-phase induction motors.
What to Check and Suggested Measures
Measure the temperature around the inverter.
 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.
 Change the mounting place to ensure the clearance.
Check if the heat sink is not clogged.
 Clean the heat sink.
Check the cumulative run time of the cooling fan. (See Chapter 5,
Section "5.6.4.4 Viewing Maintenance Information".)
 Replace the cooling fan.
Visually check whether the cooling fan rotates normally.
 Replace the cooling fan.
Measure the output current.
 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.).
 Decease the motor sound (carrier frequency) (F26).
 Enable the overload prevention control (H70).
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