6-5
Possible Causes What to Check and Suggested Measures
(4) A frequency command
with higher priority than
the one attempted (e.g.,
multi-frequency,
communications or
jogging operation, etc.)
was active and the
reference frequency was
set to too low a value.
Check the settings (data) of the relevant function codes and
what frequency commands are being received, through Menu
#1 "Data setting," Menu #2 "Data checking" and Menu #4 "I/O
checking," using the remote keypad and referring to the bloc
diagram of the frequency setting circuit.
*Refer to the FRENIC-Mini User’s Manual (MEH446), Chapter 4.
Correct any incorrect function code data settings (e.g.
cancel higher priority run commands, etc.).
(5) The acceleration/
deceleration time was too
long.
Check the data of function codes F07, F08, E10, E11 and H54.
Change the acceleration/deceleration time to match the
load.
(6) Overload Measure the output current.
Lighten the load (e.g., operate the mechanical brake
correctly).
Check if mechanical brake is working.
Release the mechanical brake.
Make sure that F43 (Current limiter (mode selection)) is set to
"2" and check the setting of F44 (Current limiter (level)).
Readjust the setting of F44, or disable the function of current
limiting in F43.
Decrease the value of torque boost (F09), then turn the powe
off and back on again and check if the speed increases.
Adjust the value of the torque boost (F09).
(7) The current limiting
operation did not increase
the output frequency.
Check the data of function codes F04, F05, H50, and H51 to
ensure that the V/f pattern is right.
Match the V/f pattern values with the motor ratings.
(8) Bias and gain set
incorrectly.
Check the data of function codes F18, C50, C32, C34, C37 and
C39.
Readjust the bias and gain to appropriate values.
[ 3 ] The motor runs in the opposite direction to the command.
Possible Causes What to Check and Suggested Measures
(1) Wiring has been
connected to the motor
incorrectly
Check the wiring to the motor.
Connect terminals U, V, and W of the inverter to the
respective U, V, and W terminals of the motor.
(2) Incorrect connection and
settings for run commands
and rotation direction
command FWD and REV
Check the data of function codes E98 and E99 and the
connection to terminals [FWD] and [REV].
Correct the data of the function codes and the connection.
(3) The setting for the rotation
direction via keypad
operation is incorrect.
Check the data of function code F02 (Operation method).
Change the data of function code F02 to 2 (forward rotation)
or 3 (reverse rotation).
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