Maeda MK0003, Service Manual, Page: 316 / 348

5-22
Symptom Content of the likely cause Countermeasures
Reference
The
motor/machine
noise is loud. The carrier frequency is low. Raise the carrier frequency (b083).However, noise
and leakage current from the inverter may increase.
Derating may be required for the output current
depending on the model. Refer to the “Derating
table” for the details.
The rotation frequency of the motor and
the natural frequency of the machine
are resonating. Change the set frequency. If the motor resonates
during acceleration/deceleration, use the frequency
jump function (A063 to A068) to avoid the
resonating frequency.
Overexcitation of the motor. Match the standard frequency (A003/A203), motor
receiving voltage selection (A082/A282) to the
motor rating. If the issue is not resolved, lower the
output voltage gain (A045/A245) by a small
amount. Or set “02: free V/f setting” for the control
method (A044/A244) and tune.
Trips with overload
protection (E05). The electric thermal level is not correct. Properly set the electric thermal level (b012/b013).
Trips with
overvoltage
protection (E07)
during
deceleration. Deceleration time is short. Extend the deceleration time
(F003/F203/A093/A293).
The deceleration overcurrent restriction
function selection (b130) is set to “00:
disable”. Enable the deceleration overcurrent restriction
function selection (b130). (However, when this
function is enabled, the actual deceleration time
may become longer than the set value. Refer to
“Deceleration Overcurrent Restriction Function” for
details.
[If the motor trips (E07) due to overvoltage during deceleration, regardless of the deceleration
overcurrent restriction function selection (b130) enabled]
The value in the deceleration
overcurrent restriction ratio gain (b133),
deceleration overcurrent restriction
reset time (b134) is inappropriate. Change the setting values. Refer to “Deceleration
Overcurrent Restriction Function” for details.
The deceleration overcurrent restriction
level (b131) is high. Reduce the deceleration overcurrent restriction
level (b131). (However, if the setting is too low, the
motor may not decelerate, so the minimum value
should be receiving voltage ×
√ 2 × 110%.)
Trips with
thermistor error
(E35). “19: TH (external thermistor)” is
assigned to the multi function input
terminal S5/TH, and DC 24 V is being
inputted. Remove the TH assignment.
The output
frequency
becomes unstable. Each parameter is not correct. Move the output frequency away from the power
source frequency.
Change the stability constant (H006/H206).
The changes in load are large. Raise the motor and inverter capacities.
The power source voltage is
fluctuating. Reduce the fluctuation.
Lacking torque. Each parameter is not correct.
[During acceleration/constant speed] Raise the main torque boost voltage (A042/A242)
and manual torque boost frequency (A043/A243).
Set torque boost selection (A042/A241) to “01:
automatic torque boost”.
Reduce the carrier frequency (b083).
Set the control method (A044/A244) to “03: sensor
less vector control”.
Each parameter is not correct
[During deceleration] Extend the deceleration time
(F003/F203/A093/A293).
Turn the AVR selection (A081/A281) OFF.
Use either the breaking resistor or regenerative
braking unit.
The inverter trips,
or free runs, or
decelerates to a
stop when the
digital operator is
removed. The operation selection for operator
breakage is inappropriate. Set the operator breakage operation selection
(b165) to “02: ignore”.