Mitsubishi Electronics FR-A500L instruction manual Faults and check points, Motor remains stopped

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PROTECTIVE FUNCTIONS

5.2.2 Faults and check points

POINT: Check the corresponding areas. If the cause is still unknown, it is recommended to initialize the parameters (return to factory settings), re-set the required parameter values, and check again.

(1) Motor remains stopped.

1)Check the main circuit

·Check that a proper power supply voltage is applied (operation panel display is provided).

·Check that the motor is connected properly.

2)Check the input signals

·Check that the start signal is input.

·Check that both the forward and reverse rotation start signals are not input.

·Check that the frequency setting signal is not zero.

·Check that the AU signal is on when the frequency setting signal is 4 to 20mA.

·Check that the output stop signal (MRS) or reset signal (RES) is not on.

·Check that the CS signal is not off when automatic restart after instantaneous power failure is selected (Pr. 57 = other than "9999").

3)Check the parameter settings

·Check that the reverse rotation prevention (Pr. 78) is not selected.

·Check that the operation mode (Pr. 79) setting is correct.

·Check that the bias and gain (Pr. 902 to Pr. 905) settings are correct.

·Check that the starting frequency (Pr. 13) setting is not greater than the running frequency.

·Check that various operational functions (such as three-speed operation), especially the maximum frequency (Pr. 1), are not zero.

4)Check the load

·Check that the load is not too heavy.

·Check that the shaft is not locked.

5)Others

·Check that the ALARM lamp is not lit.

·Check that the Pr. 15 "jog frequency" setting is not lower than the Pr. 13 "starting frequency" value.

(2) Motor rotates in opposite direction.

·Check that the phase sequence of output terminals U, V and W is correct.

·Check that the start signals (forward rotation, reverse rotation) are connected properly.

(3) Speed greatly differs from the setting.

·Check that the frequency setting signal is correct. (Measure the input signal level.)

·Check that the following parameter settings are proper: Pr. 1, Pr. 2, Pr. 902 to Pr. 905, Pr. 19.

·Check that the input signal lines are not affected by external noise. (Use shielded cables)

·Check that the load is not too heavy.

(4) Acceleration/deceleration is not smooth.

·Check that the acceleration and deceleration time settings are not too short.

·Check that the load is not too heavy.

·Check that the torque boost (Pr. 0, Pr. 46, Pr. 112) setting is not too large to activate the stall function.

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Contents FR-A560L-375K~900K-NA This section is specifically about safety matters Fire Prevention Electric Shock PreventionInjury Prevention Trial run Transportation and installationWiring Additional instructionsDisposing of the inverter Maintenance, inspection and parts replacementOperation Emergency stopContents Chapter Outline Pre-Operation Information Precautions for operationInstallation WiringBasic configuration Basic ConfigurationName Description Chapter Instructions for installation InstallationAt 5cm 1.97 inch Terminal connection diagram WiringTerminal Name Description Symbol Terminal Name DescriptionDescription of main circuit terminals Description of control circuit terminalsType Symbol Terminal Name Description Wiring instructions Wiring of the main circuitTerminal block layout P1, P, N Connection procedure NA version（OR Version） Wiring of the control circuitChanging the control logic RUN DC24V How to use terminals STOP, CS and PC For RS-485 communication Connection to the PU connectorDesign information Chapter Operation Chapter Parameters Parameters Parameter List17, 18 R a M E T E R S 173 200 278 Protective Functions Error alarm definitions Errors AlarmsOHT Panel Unit Name Description Display FR-PU04 FR-DU04 OperatioName Details Main circuit error E,15 detailsCorrespondences between digital and actual characters To know the operating status at the occurrence of alarmAlarm Code Alarm Output across B-C （FR-DU04 ） Alarm code outputResetting the inverter Operation Panel Output Terminal Signal On-Off DisplayChecking the operation panel display at alarm stop TroubleshootingOperation Check Point Remedy Panel Display Operation Panel Check Point Remedy Display Motor rotates in opposite direction Faults and check pointsSpeed greatly differs from the setting Motor remains stoppedSpeed does not increase Operation mode is not changed properlyPower lamp is not lit Motor current is largePeriodic inspection Precautions for Maintenance and InspectionPrecautions for maintenance and inspection Check itemsDielectric strength test Insulation resistance test using meggerDaily and Periodic Inspection Checking method PreparationModule device numbers and terminals to be checked Smoothing capacitors Replacement of partsPart Name Standard Replacement Description Interval Cooling fanMeasurement of voltages and currents Measurement of main circuit voltages, currents and powerMeasuring Points and Instruments Chapter Specifications Model specifications Standard specificationCommon specifications Temperature applicable for a short period in transit, etc Outline drawings FR-A560L-450K, 375KFR-A560L-530K～900K Specifications Appendices Appendix AppendixCheck the air flow direction Wiring between cooling fan and terminals is as followsAppendix Shipment case example Mitsubishi Electric Corporation
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