Fuji Electric ALPHA5 Smart, User Manual

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CHAPTER 7 MAINTENANCE AND INSPECTION
7-10
Troubleshooting Method
7
12. Overload
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
The servomotor fails to rotate
mechanically.

Check the wiring of power cables (U, V and
W) and correct faults.

Check if the brake is active.
The mechanical system is too heavy
against the servomotor capacity.

Examine the servomotor capacity, based on
the load factor.

If the rotation speed can be reduced, add a
reduction gear.

Apply the brake to retain a stopped
elevator.
The acceleration/deceleration frequency
and operation frequency are too high. Increase the cycle time and decrease the
operation frequency.
Servo amplifier is damaged. Replace the servo amplifier.
If an OL2 alarm is caused but no damaged servo amplifier or incorrect wiring is found, the
servomotor capacity must be examined.
Check the OL thermal value with the PC Loader or the monitor mode of the keypad in both cases.
13. Main Power Undervoltage
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
The source voltage drops due to
momentary power failure or similar.

Check the power supply environment whether
momentary power failure is generated or not, and
improve the power supply environment.

Check and improve the power supply capacity and
transformer capacity.
If the power supply environment is adverse, PA2_67 (alarm detection at undervoltage) can be
applied to ignore undervoltage detection. In this case, operation can be continued with the setting
of PA2_66 (flying start at speed control) in the event of momentary power failure. Undervoltage
detection is set at about 200 V by the DC voltage in the servo amplifier.

OL1: Alarm that detects failures such as a locked shaft
instantaneously. (3 s/300%)

OL2: The effective torque exceeds the allowable limit of the
servomotor. (Detection at electronic thermal relay built in servo
amplifier)
The power supplied to the servo amplifier falls below the minimum
specification voltage limit.
oL1
oL2
LuP