Fuji Electric FRENIC-Multi User Manual

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[ 10 ]
N
Electronic thermal overload alarm 1
N
Electronic thermal overload alarm 2
Problem Electronic thermal protection for motor 1 or motor 2 activated.
Possible Causes What to Check and Suggested Measures
(1) The characteristics of
electronic thermal did
not match those of the
motor overload.
Check the motor characteristics.
Î Reconsider the data of function codes (P99, F10 and F12) and
(A39, A06 and A08).
Î Use an external thermal relay.
(2) Activation level for the
electronic thermal relay
was inadequate.
Check the continuous allowable current of the motor.
Î Reconsider and change the data of function codes F11 and A07.
(3) The acceleration/
deceleration time was
too short.
Check that the motor generates enough torque for acceleration
/
deceleration. This torque is calculated from the moment of inertia
for the load and the acceleration/ deceleration time.
Î Increase the acceleration/ deceleration time (F07, F08, E10,
E11, and H56).
(4) Load was too heavy. Measure the output current.
Î Lighten the load (e.g., lighten the load before overload occurs
using E34 (Overload Early Warning). (In winter, the load tends to
increase.)
[ 11 ]
NW
Overload
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.
Î Lower the temperature (e.g., ventilate the panel well).
(2) The torque boost setting
(F09 and A05) was too
high.
Check the setting of F09 and A05 (Torque Boost) and make sure
that lowering it would not cause the motor to stall.
Î Adjust the setting of F09 and A05.
(3) 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.
Î Increase the acceleration/deceleration time (F07, F08, E10, E11,
and H56).
(4) Load was too heavy. Measure the output current.
Î Lighten the load (e.g., lighten the load before overload occurs
using the overload early warning (E34)). (In winter, the load
tends to increase.)
Î Decrease the motor sound (carrier frequency) (F26).
Î Enable overload prevention control (H70).
Check if there is sufficient clearance around the inverter.
Î Increase the clearance.
(5) Air vent is blocked.
Check if the heat sink is not clogged.
ÎClean the heat sink.

Fuji Electric FRENIC-Multi Specifications

General

Brand	Fuji Electric
Model	FRENIC-Multi
Category	Inverter
Language	English