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[ 11 ]
0lu
Overload protection
Problem Temperature inside inverter rose abnormally.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the
inverter exceeded that of
inverter specifications.
Measure the temperature around the inverter.
Lower the temperature (e.g., ventilate the panel well).
Lighten the load.
Check the cumulative running time of cooling fan. Refer to
Chapter 3, Section 3.2.2 [5], "Reading Maintenance
Information."
Replace the cooling fan.
(2) The service life of the
cooling fan has expired or
the cooling fan
malfunctioned.
Visually check that the cooling fan rotates normally.
Replace the cooling fan.
Check if there is sufficient clearance around the inverter.
Increase the clearance.
(3) Air vent is blocked.
Check if the heat sink is not clogged.
Clean the heat sink.
(4) Load was too heavy. Measure the output current.
Lighten the load (e.g., lighten the load before overload
occurs using the overload early warning (E34)).
Decrease the motor sound (carrier frequency) (F26).
Enable overload prevention control (H70).
(5) The acceleration/
deceleration time was too
short.
Recalculate the required acceleration/deceleration torque and
time from the moment of inertia for the load and the
deceleration time.
Increase the acceleration/deceleration time (F07, F08, E10,
E11 and H54).
(6) The wires to the motor are
too long and caused a
large amount of current to
leak from them.
Measure the leak current.
Insert an output circuit filter (OFL).
[ 12 ]
er1
Memory error
Problem Error occurred in writing the data to the memory in the inverter.
Possible Causes What to Check and Suggested Measures
(1) While the inverter was
writing data (especially
initializing data), power
supply was turned off and
the voltage for the control
circuit dropped.
Check if pressing the
key resets the alarm after the
function code data are initialized by setting the data of H03 to
1.
Return the initialized function code data to their previous
settings, then restart the operation.
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