6.5 Other Errors
6-39
[ 7 ] The motor does not restart even after the power recovers from a momentary power
failure
(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 status 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
(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.
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.
The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".
[ 9 ] The motor does not run as expected
(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.
(2) The forced operation function
(Fire Mode) is being used.
Check that function codes are correctly configured and no unnecessary
configuration has been done.
➔ Check the operation selection (H116) setting for forced operation.
➔ Check digital input terminal forced operation command “FMS”.
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