6-7
[ 6 ] The motor does not accelerate and decelerate at the set time.
Possible Causes What to Check and Suggested Measures
(1) The inverter ran the
motor by 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
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 appropriate value, or disable the
function of current limiter in F43.
Î Increase the acceleration/deceleration time (F07, F08, E10 and
E11).
(3) The automatic
regenerative braking
was active (during
deceleration).
Check the data of function code H69 (Automatic deceleration).
Î Increase the deceleration time (F08 and E11).
(4) Overload Measure the output current.
Î Lighten the load (In the case of a fan or a pump load, lower the
setting data of the F15 (Frequency limiter (High)). (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 and A05) is increased.
Î Increase the value of the torque boost (F09 and A05).
(6) An external frequency
command is being used.
Check that there is no noise in the external signal wires.
Î Isolate the control signal wires from the main circuit wires as fa
as possible.
Î Use shielded wire or twisted wire for the control signal wires.
Î Connect a capacitor to the output terminal of the frequency
command or insert a ferrite core in the signal wire. (Refer to
Chapter 2, Section 2.3.6 "Wiring for control circuit terminals.")
(7) In torque limit operation,
the acceleration/
deceleration is
suppressed.
Check whether data of torque limiter related function codes (F40,
F41, E16 and E17) is correctly configured and the torque switching
signal TL2/TL1 is correct.
Î Reconfigure data of F40, F41, E16 and E17 correctly or reset it to
the factory default.
Î Switch correctly the torque switching terminal command
TL2/TL1.
Î Lengthen the acceleration/deceleration time (F07, F08, E10 and
E11).
(8) Any acceleration/
deceleration time is
invalidly set.
The terminal command RT1 switching between the acceleration/
deceleration time 2 and 1 turns ON/OFF invalidly.
Î Turn the RT1 ON/OFF validly. For reference, if RT1 is ON, the
acceleration/deceleration time 2 is applied.
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