Fuji Electric FRENIC-Ace series - The Motor Does Not Restart Even after the Power Recovers from a Momentary Power Failure

6.5 When Codes Other Than Alarm Codes and Light Alarm Indication (
l-al ) are Displayed
6-30
Possible Causes Check and Measures
(7) The output frequency is limited
by the torque limiter.
Check whether the data of torque limit levels (F40, F41, E16, E17) are
set to appropriate values. Also, check whether torque limit 2/1 switching
signal [TL2/TL1] 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 times (F07, F08, E10
through E15).
(8) The specified acceleration or
deceleration time was incorrect.
Check the terminal commands RT1 and RT2 for acceleration/
deceleration times.
 Correct the RT1 and RT2 settings.
[ 7 ] The motor does not restart even after the power recovers from a momentary power
failure
Possible Causes Check and Measures
(1) The data of function code F14 is
either “0,” “1,” or “2.”
Check if an undervoltage trip ( lu ) occurs.
 Change the data of function code F14 (Restart mode after
momentary power failure (Mode selection)) to “3,” “4,” or “5.”
(2) The run command remains OFF
even after the power has been
restored.
Check the input signal with Menu “I/O Checking” using the keypad. See
Chapter 3 “3.4.4 Checking I/O signal status.”
 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 a 3-wire operation, momentary power failure duration is long so that
control circuit power source of inverter is shut off once. Therefore,
“select 3-wire operation” signal [HLD] is switched 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.
[ 8 ] Motor generates heat abnormally
Possible Causes Check and Measures
(1) Excessive torque boost
specified.
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*).
(2) Continuous running in
extremely slow speed.
Check the running speed of the inverter.
 Change the speed setting or replace the motor with a motor
exclusively designed for inverters.
(3) Overload. Measure the inverter output current.
 Reduce the load. In the case of fans/pumps, lower the setting value
of F15 (Frequency limiter (Upper limit)). In winter, the load tends to
increase.
[ 9 ] The motor does not run as expected
Possible Causes Check and Measures
(1) Incorrect setting of function
code data.
Check that function codes are correctly configured and no unnecessary
configuration has been done.
 Configure all the function codes correctly.
Make a note of function code data currently configured and then
initialize all function code data using H03.
 After the above process, reconfigure function codes one by one,
checking the running status of the motor.