Fuji Electric FRENIC-HVAC User Manual page 663

Possible Causes
(7) The output frequency is limited
by the torque limiter.
(8) The specified acceleration or
deceleration time was
incorrect.
[ 7 ] The motor does not restart even after the power recovers from a
momentary power failure.
Possible Causes
(1) The data of function code F14
is either "0," "1," or "2."
(2) The run command remains
OFF even after the power has
been restored.
[ 8 ] The motor abnormally heats up.
Possible Causes
(1) Excessive torque boost
specified.
(2) Continuous running in
extremely slow speed.
(3) Overload.
What to Check and Suggested Measures
Check whether data of torque limiter related function codes (F40, F41,
E16 and E17) is correctly configured and the TL2/TL1 terminal
command ("Select torque limiter level 2/1") is correct.
 Correct the data of F40, F41, E16 and E17 or reset them to the
factory defaults.
 Set the TL2/TL1 correctly.
 Increase the acceleration/deceleration time (F07, F08, E10 through
E15).
Check the terminal commands RT1 and RT2 for acceleration/
deceleration times.
 Correct the RT1 and RT2 settings.
What to Check and Suggested Measures
Check if an undervoltage trip (LV) occurs.
 Change the data of function code F14 (Restart mode after
momentary power failure (Mode selection)) to "3," "4," or "5."
Check the input signal with Menu "I/O Checking" using the keypad.
 Check the power recovery sequence with an external circuit. If
necessary, consider the use of a relay that can keep the run command
ON.
In 3-wire operation, the power to the control printed circuit board
(control PCB) has been shut down once because of a long momentary
power failure time, or the "Enable 3-wire operation" signal HOLD has
been turned OFF once.
 Change the design or the setting so that a run command can be
issued again within 2 seconds after the power has been restored.
What to Check and Suggested Measures
Check whether decreasing the torque boost (F09) decreases the output
current but does not stall the motor.
 If no stall occurs, decrease the torque boost (F09).
Check the running speed of the inverter.
 Change the speed setting or replace the motor with a motor
exclusively designed for inverters.
Measure the inverter output current.
 Reduce the load (For fans or pumps, decrease the frequency limiter
value (F15).) (In winter, the load tends to increase.)
9-29
9.4 Nothing appears on the monitor