Inverter Overload; Motor 1 Overload Motor 2 Overload - Fuji Electric FRN0001C2S-2A FRN0002C2S-2A FRN0004C2S-2A FRN0006C2S-2A FRN0010C2S-2A FRN0012C2S-2A FRN0020C2S-2A FRN0025C2S-2A FRN0033C2S-2A FR Instruction Manual

Possible Causes
(3) Incorrect setting of
function code data F50
and F51.
Note: The inverter issues an overheat alarm of the braking resistor by monitoring the magnitude of
the braking load, not by measuring its surface temperature.
When the braking resistor is frequently used so as to exceed the settings made by function codes
F50 and F51, therefore, the inverter issues an overheat alarm even if the surface temperature of the
braking resistor does not rise. To squeeze out full performance of the braking resistor, configure
function codes F50 and F51 while actually measuring the surface temperature of the braking
resistor.
[ 11 ] Motor 1 overload
0l1
Motor 2 overload
0l2
Problem Electronic thermal protection for motor 1 or motor 2 activated.
Possible Causes
(1) The electronic thermal
characteristics do not
match the motor
overload characteristics.
(2) Activation level for the
electronic thermal
protection was
inadequate.
(3) The specified
acceleration/
deceleration time was
too short.
(4) Load was too heavy.
[ 12 ]

Inverter overload

0lu
Problem Temperature inside inverter has risen abnormally.
Possible Causes
(1) Temperature around the
inverter exceeded the
inverter's specification
range.
(2) Excessive torque boost
specified. (F09, A05)
What to Check and Suggested Measures
Recheck the specifications of the braking resistor.
 Review the data of function codes F50 and F51, then reconfigure
them.
What to Check and Suggested Measures
Check the motor characteristics.
 Reconsider the data of function codes (P99, F10 and F12) or
(A39, A06 and A08).
 Use an external thermal relay.
Check the continuous allowable current of the motor.
 Reconsider and change the data of function code F11 or A07.
Recalculate the acceleration/deceleration torque and time needed
for the current load, based on the moment of inertia of the load and
the acceleration/deceleration time.
 Increase the acceleration/deceleration time (F07, F08, E10,
E11).
Measure the output current.
 Reduce the load (e.g. Use the overload early warning (E34) to
reduce the load before the overload protection is activated.). (In
winter, the load tends to increase.)
What to Check and Suggested Measures
Measure the temperature around the inverter.
 Lower the temperature (e.g., ventilate the panel where the
inverter is mounted).
Check whether decreasing the torque boost (F09, A05) does not
stall the motor.
 If no stall occurs, decrease the torque boost (F09, A05).
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