Fuji Electric FRENIC-AQUA series, User Manual

Page: 671 / 751

9-6
Possible Causes
What to Check and Suggested Measures
(3) The power supply voltage did
not reach the inverter's
specification range.
Measure the input voltage.
Î Increase the voltage to within the specified range.
(4) Peripheral equipment for the
power circuit malfunctioned, or
the connection was incorrect.
Measure the input voltage to find which peripheral equipment
malfunctioned or which connection is incorrect.
Î Replace any faulty peripheral equipment, or correct any incorrect
connections.
(5) Any other loads connected to
the same power supply have
required a large starting
current, causing a temporary
voltage drop.
Measure the input voltage and check the voltage fluctuation.
Î Reconsider the power supply system configuration.
(6) Inverter's inrush current caused
the power voltage drop because
the power supply transformer
capacity was insufficient.
Check if the alarm occurs when a molded case circuit breaker (MCCB),
residual-current-operated protective device (RCD)/earth leakage circuit
breaker (ELCB) (with overcurrent protection) or magnetic contactor
(MC) is turned ON.
Î Reconsider the capacity of the power supply transformer.
[ 5 ] 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) Breaks in wiring to the main
power input terminals.
Measure the input voltage.
Î Repair or replace the main circuit power input wires or input
devices (MCCB, MC, etc.).
(2) The screws on the main power
input terminals are loosely
tightened.
Check if the screws on the main power input terminals have become
loose.
Î Tighten the terminal screws to the recommended torque.
(3) Interphase voltage unbalance
between three phases was too
large.
Measure the input voltage.
Î Connect an AC reactor (ACR) to lower the voltage unbalance
between input phases.
Î Increase the inverter capacity.
(4) Overload cyclically occurred. Measure the ripple wave of the DC link bus voltage.
Î
If the ripple is large, increase the inverter capacity.
(5) Single-phase voltage was input
to the three-phase input
inverter.
Check the inverter type.
Î Apply three-phase power. The FRENIC-AQUA of three-phase
input cannot be driven by single-phase power.
The input phase loss protection can be disabled with the function code H98
(Protection/Maintenance Function).