Fuji Electric FRENIC-ECO, Instruction Manual

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6-11
Possible Causes What to Check and Suggested Measures
(3) Interphase unbalance rate
of three-phase voltage
was too large.
Measure the input voltage.
Î Connect an AC reactor (ACR) to lower the voltage unbalance between
input phases.
Î Raise the inverter capacity.
(4) Overload cyclically
occurred.
Measure ripple wave of DC link bus voltage.
Î If the ripple is large, raise the inverter capacity
(5) Single-phase voltage was
input to the inverter
instead of three-phase
voltage input.
Check the inverter type.
Î Apply three-phase power. FRENIC-Eco cannot be driven by single-phase
power source.
You can disable input phase loss protection using the function code H98.
[ 6 ] 0pl 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) Wires for motor winding
are 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-Eco only
drives three-phase induction motors.
[ 7 ] 0h1 Heat sink overheat
Problem Temperature around heat sink rose.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the
inverter exceeded that of
inverter specifications.
Measure the temperature around the inverter.
Î Lower the temperature around the inverter (e.g., ventilate the enclosure
well).
Check if there is sufficient clearance around the inverter.
Î Increase the clearance.
(2) Air vent is blocked.
Check if the heat sink is not clogged.
Î Clean the heat sink.
Check the cumulative running time of the cooling fan. Refer to Chapter 3,
Section 3.4.6 "Reading maintenance information – "MAINTENANC"."
Î Replace the cooling fan.
(3) Accumulated running time
of the cooling fan
exceeded the standard
period for replacement, or
the cooling fan
malfunctioned.
Visually check whether the cooling fan rotates abnormally.
Î Replace the cooling fan.
(4) Load was too heavy. Measure the output current.
Î
Lighten the load (e.g. lighten the load before the overload protection
occurs using the overload early warning (E34). (In winter, the load tends
to increase.)
Î Decease the motor sound (carrier frequency) (F26).
Î
Enable the overload protection control (H70).