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6-13
Possible Causes
What to Check and Suggested Measures
(4) Peripheral equipment
for the power circuit
malfunctioned, or the
connection was
incorrect.
Measure the input voltage to find where the peripheral equipment
malfunctioned or which connection is incorrect.
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Replace any faulty peripheral equipment, or correct any incorrect
connections.
(5) Other loads were
connected to the same
power supply and
required a large current
to start running to the
extent that it caused a
temporary voltage drop
on the supply side.
Measure the input voltage and check the voltage variation.
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Reconsider the power system configuration.
(6) Inverter's inrush current
caused the power
voltage drop because
power supply transformer
capacity was insufficient.
Check if the alarm occurs when you switch on a molded case circuit
breaker, an earth leakage circuit breaker (with overcurrent
protection) or a magnetic contactor.
Î
Reconsider the capacity of the power supply transformer.
[ 4 ]
lin
Input phase loss
Problem
Input phase loss occurred, or interphase voltage unbalance rate was large.
Possible Causes
What to Check and Suggested Measures
(1) Main circuit power input
wires broken.
Measure the input voltage.
Î
Repair or replace the wires.
(2) The terminal screws for
the main circuit power
input of the inverter were
not tight enough.
Check if the screws on the inverter input terminals have become
loose.
Î
Tighten the terminal screws to the recommended torque.
(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
three-phase input
inverter instead of
three-phase voltage
input.
Check the inverter type.
Î
Apply three-phase power. FRENIC-Multi of three-phase input
cannot be driven by single-phase power supply.
You can disable input phase loss protection using the function code H98
(Protection/Maintenance Function).