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6-7
[ 6 ] The motor does not accelerate or decelerate within the specified time.
Possible Causes
What to Check and Suggested Measures
(1) The inverter ran the
motor with S-curve or
curvilinear pattern.
Check the data of function code H07 (Acceleration/deceleration
pattern).
Î
Select the linear pattern (H07 = 0).
Î
Shorten the acceleration/deceleration time (F07, F08, E10 and
E11).
(2) The current limiting
operation prevented the
output frequency from
increasing (during
acceleration).
Make sure that F43 (Current limiter (Mode selection)) is set to "2:
Enable during acceleration and at constant speed," then check that
the setting of F44 (Current limiter (Level)) is reasonable.
Î
Readjust the setting of F44 to an appropriate value, or disable
the function of current limiter with F43.
Î
Increase the acceleration/deceleration time (F07, F08, E10 and
E11).
(3) The automatic
deceleration
(Anti-regenerative
control) is enabled during
deceleration.
Check the data of function code H69 (Automatic deceleration
(Mode selection)).
Î
Increase the deceleration time (F08 and E11).
(4) Overload.
Measure the output current.
Î
Reduce the load (For fans or pumps, decrease the frequency
limiter value (F15).) (In winter, the load tends to increase.).
(5) Torque generated by the
motor was insufficient.
Check that the motor starts running if the value of the torque boost
(F09, A05) is increased.
Î
Increase the value of the torque boost (F09, A05).
(6) An external
potentiometer is used for
frequency setting.
Check that there is no noise in the control signal wires from external
sources.
Î
Isolate the control signal wires from the main circuit wires as far
as possible.
Î
Use shielded or twisted wires for control signals.
Î
Connect a capacitor to the output terminal of the external
frequency potentiometer or set a ferrite core on the signal wire.
(See Figure 2.6.)
(7) The specified
acceleration/deceleration
time is incorrect.
Check the terminal command
RT1
("Select ACC/DEC time").
Î
Correct the
RT1
setting.