FujiFilm Frenic-Mini Instruction Manual page 130

Possible Causes
(2) The power to the inverter
was switched back on too
soon (with F14 = 1)
(3) The power supply voltage
did not reach the range of
the inverter's
specifications.
(4) Peripheral equipment for
the power circuit
malfunctioned, or the
connection was incorrect.
(5) Other loads were
connected to the same
power system and
required a large current to
start running to the extent
that it caused a temporary
voltage drop.
(6) Inrush current caused the
power voltage drop
because power
transformer capacity was
insufficient.
L
[ 4 ] Input phase loss protection
Problem Input phase loss occurred, or interphase voltage unbalance rate was large.
Possible Causes
(1) Main circuit power input
wires broken.
(2) The terminal screws for
the main circuit power
input were not tight
enough.
(3) Interphase unbalance rate
of three-phase voltage
was too large.
(4) Overload cyclically
occurred.
(5) Single-phase voltage was
inputted to the inverter
instead of three-phase
voltage input.
What to Check and Suggested Measures
Check that you switch the inverter on after the power for the
control circuit had reached an appropriate level. This can be
checked using the display on the LED monitor.
Wait for a longer time than the last time before switching
the inverter on.
Measure the input voltage.
Increase the voltage to within that of the specifications.
Measure the input voltage to find where the peripheral
equipment malfunctioned or which connection is incorrect.
Replace any faulty peripheral equipment, or correct any
incorrect connections.
Measure the input voltage and check the voltage variation.
Reconsider the power system configuration.
Check if the alarm occurs when you switch on a molded case
circuit breaker, an earth leakage circuit breaker (with the
exception of those exclusively designed for protection from
ground faults) or a magnetic contactor.
Reconsider the capacity of the power transformer.
What to Check and Suggested Measures
Measure the input voltage.
Repair or replace the wires.
Check if the terminal screws have become loose.
Tighten the terminal screws to the recommended torque.
Measure the input voltage.
Connect an AC reactor (ACR) or a DC reactor (DCR) to
lower the rate.
Raise the inverter capacity.
Measure ripple wave of DC link circuit voltage.
If the ripple is large, raise the inverter capacity
Check the inverter type.
Change the inverter to one for single-phase voltage input.
6-11