Lin Input Phase Loss; Lu Undervoltage - Fuji Electric FRENIC-Ace series User Manual

[ 23 ] Input phase loss
lin
Phenomena Input phase loss occurred, or interphase voltage unbalance rate was large.
If the auxiliary power (R0, T0) is taken from the breaker primary side (power supply side), a "
alarm may occur even if there has been no phase loss.
Possible Causes
(1) Breaks in wiring to the main
power input terminals.
(2) The screws on the main power
input terminals are loosely
tightened.
(3) Interphase voltage unbalance
among three phases was too
large.
(4) Overload cyclically occurred.
(5) Single-phase voltage was input
to the three-phase input
inverter.
The input phase loss protection can be disabled with the function code H98.
[ 24 ] Undervoltage
lu
Phenomena DC intermediate circuit voltage has dropped below the undervoltage detection level.
Possible Causes
(1) A momentary power failure
occurred.
[Subcode:1]
[Subcode: ]
3
(2) The power to the inverter was
switched back to ON too soon
(when F14 = 1).
[Subcode:2]
(3) The power supply voltage did
not reach the inverter's type
correct range.
(4) Peripheral equipment for the
power circuit malfunctioned, or
the connection was incorrect.
(5) Any other loads connected to
the same power supply has
required a large starting current,
causing a temporary voltage
drop.
(6) Inverter's inrush current caused
the power voltage drop because
the power supply transformer
capacity was insufficient.
6.3 If an Alarm Code Appears on the LED Monitor
Check and Measures
Measure the input voltage.
 Repair or replace the main circuit power input wires or input devices
(MCCB, MC, etc.).
Check if the screws on the main power input terminals have become
loose.
 Tighten the terminal screws to the recommended torque.
Measure the input voltage.
 Connect an AC reactor (ACR) to lower the voltage unbalance
between input phases.
 Increase the inverter capacity.
Measure the ripple wave of the DC intermediate circuit voltage.
 If the ripple is large, increase the inverter capacity.
Check the inverter type.
 Apply three-phase power.
Check and Measures
 Release the alarm.
 If you want to restart running the motor without treating this
condition as an alarm, set F14 to "3," "4," or "5," depending on the
load type.
Check if the power to the inverter was switched back to ON while the
control power was still alive. Check whether the LEDs on the keypad are
lit.
 Turn the power ON again after all LEDs on the keypad go off.
Measure the input voltage.
 Increase the voltage to within the specified range.
Measure the input voltage to find which 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 fluctuation.
 Reconsider the power supply system configuration.
Check if the alarm occurs when a molded case circuit breaker (MCCB),
earth leakage circuit breaker (ELCB) (with overcurrent protection) or
magnetic contactor (MC) is turned ON.
 Reconsider the capacity of the power supply transformer.
6-15
"
lin