6.5 Other Errors
6-34
[ 2 ] The motor rotates, but the speed does not increase
(1) The maximum frequency
currently specified was too low.
Check the data of function code F03* (Maximum output frequency 1).
➔ Correct the F03* data.
(2) The data of frequency limiter
(Upper limit) currently specified
was too low.
Check the data of function code F15 (Frequency limiter (Upper limit)).
➔ Correct the F15 data.
The factory default is set to 70 Hz. If running the motor with maximum
output frequency 1 (F03*) set to 70 Hz or higher, it will also be
necessary to increase the F15 value.
(3) The reference frequency is too
low.
Check that the reference frequency has been entered properly using
Menu “I/O Checking” on the keypad.
➔ Increase the reference frequency.
➔ Inspect the external frequency command potentiometers, signal
converters, switches, and relay contacts. Replace any ones that are
faulty.
➔ Connect external circuit wirings of terminals [13], [12], [11], [C1],
and [V2] correctly.
(4) A frequency command (e.g.,
multi-frequency or via
communication) with higher
priority than the one attempted
was active and its reference
frequency was too low.
Based on the frequency setting block diagram (See Chapter 8), check
the function code data from the Menu using the keypad, and perform an
I/O check to check the input frequency command.
➔ Correct any incorrect data of function codes (e.g. cancel the higher
priority frequency command).
(5) The acceleration time was too
long or too short.
Check the data of acceleration times (F07, E10, E12, E14).
➔ Change the acceleration time to match the load.
Measure the inverter output current.
➔ Reduce the load.
Check whether any mechanical brake is applied.
➔ Release the mechanical brake.
(7) Function code settings do not
agree with the motor
characteristics.
When automatic torque boost and automatic energy-saving operations
are performed, confirm that P02*, P03*, P06*, P07*, P08* agree with
motor constants.
➔ Perform auto-tuning of the inverter for every motor to be used.
(8) The output frequency does not
increase due to the current
limiter operation.
Make sure that F43 (Current limiter (Mode selection)) is set to “2” and
check the data of F44 (Current limiter (Level)).
➔ Change the F44 data correctly. Or, set the F43 data to “0” (Disable)
if the current limiter operation is not needed.
Decrease the value of torque boost (F09*), then run the motor again and
check if the speed increases.
➔ If no stall occurs, decrease the F09* data.
Check the data of function codes (F04*, F05*, H50, H51, H52, H53,
H65, and H66) to ensure that the V/f pattern setting is right.
➔ Match the V/f pattern setting with the motor ratings.
(9) The output frequency does not
increase due to the torque
limiter operation.
Check whether the data of torque control 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.
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