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[ 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 settings and service condition.
Î
Correct them for single-phase use, referring to Chapter 1, Section 1.3.4 "Precautions
for use on single-phase input.
(6) Running on single-phase power
Î
Refer to Section 6.7 "If the Inverter is Running on Single-Phase Power," [ 5 ].
The input phase loss protection can be disabled with the function code H98 (Protection/Maintenance Function).
[ 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) The motor winding is 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-MEGA only drives
three-phase induction motors.
[ 7 ]
0h1
Heat sink overheat
Problem Temperature around heat sink has risen abnormally.
Possible Causes
What to Check and Suggested Measures
(1) Temperature around the
inverter exceeded the inverter's
specification range.
Measure the temperature around the inverter.
Î
Lower the temperature around the inverter (e.g., ventilate the panel where the
inverter is mounted).
(2) Ventilation path is blocked.
Check if there is sufficient clearance around the inverter.
Î
Change the mounting place to ensure the clearance.
Check if the heat sink is not clogged.
Î
Clean the heat sink.
Содержание FRENIC-MEGA
Страница 36: ...2 6 Unit inch mm Refer to Section 2 3 3 9...
Страница 208: ...5 89 Examples of Sequence Circuits 1 Standard sequence 2 Sequence with an emergency switching function...
Страница 356: ...MEMO...
Страница 358: ...Fuji Electric Co Ltd Fuji Electric Corp of America http www fujielectric com fecoa 2011 04 D11 D10...