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6-12
Possible Causes
What to Check and Suggested Measures
(3) The specified
deceleration time was
too short for the moment
of inertia of the load.
Recalculate the deceleration torque based on the moment of inertia
of the load and the deceleration time.
Î
Increase the deceleration time (F08, E11).
Î
Enable the automatic deceleration (anti-regenerative control)
(H69 = 2 or 4), or deceleration characteristics (H71 = 1).
Î
Set the rated voltage (at base frequency) (F05, A03) to "0" to
improve the braking capability.
(4) The specified
acceleration time was
too short.
Check if the overvoltage alarm occurs after rapid acceleration.
Î
Increase the acceleration time (F07, E10).
Î
Select the S-curve pattern (H07).
(5) Braking load was too
heavy.
Compare the braking torque of the load with that of the inverter.
Î
Set the rated voltage (at base frequency) (F05, A03) to "0" to
improve the braking capability.
(6) Malfunction caused by
noise.
Check if the DC link bus voltage was below the protective level
when the overvoltage alarm occurred.
Î
Implement noise control measures. For details, refer to the
FRENIC-Mini User's Manual, "Appendix A."
Î
Enable the auto-reset (H04).
Î
Connect a surge absorber to magnetic contactor's coils or other
solenoids (if any) causing noise.
[ 3 ]
lu
Undervoltage
Problem
DC link bus voltage has dropped below the undervoltage detection level.
Possible Causes
What to Check and Suggested Measures
(1) A momentary power
failure occurred.
Î
Reset the alarm.
Î
To restart the motor without treating this condition as an alarm,
set F14 to "4" or "5," depending on the load type.
(2) The power to the
inverter was switched
back to ON too soon
(when F14 = 1).
Check if the power to the inverter was switched back to ON while
the control power was still alive. (Check whether the LEDs on the
keypad light.)
Î
Switch the power ON again after all LEDs on the keypad go off.
(3) The power supply
voltage did not reach the
inverter's specification
range.
Measure the input voltage.
Î
Increase the voltage to within the specified range.
(4) Peripheral equipment
for the power circuit
malfunctioned, or the
connection was
incorrect.
Measure the input voltage to find which peripheral equipment
malfunctioned or which connection is incorrect.
Î
Replace any faulty peripheral equipment, or correct any incorrect
connections.