FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

Check first when you have troubles5.5.11 Speed varies during operationWhen advanced magnetic flux vector control, real sensorless vector control, vector control or encoderfeedback control is exercised, the output frequency varies with load fluctuation between 0 and 2Hz. This isa normal operation and is not a fault.1) Inspection of load3) OthersCheck that the load is not varying.2) Check the input signalsCheck that the frequency setting signal is not varying.Check that the frequency setting signal is not affected by noise. Input filter to the analog inputterminal using Pr. 74 Input filter time constant and Pr. 822 Speed setting filter 1.Check for a malfunction due to undesirable currents when the transistor output unit is connected.(Refer to page 26)Check that the settings of Pr. 80 Motor capacity and Pr. 81 Number of motor poles are correct to theinverter capacity and motor capacity under advanced magnetic flux vector control, real sensorlessvector control or vector control.Check that the wiring length is not exceeding 30m when advanced magnetic flux vector control, realsensorless vector control or vector control is exercised. Perform offline auto tuning. (Refer to pege 171)Check that the wiring length is not too long for V/F control.Change the Pr. 19 Base frequency voltage setting (about 3%) under V/F control.5.5.12 Operation mode is not changed properlyIf the operation mode does not change correctly, check the following:1) Inspection of loadCheck that the STF or STR signal is off.When it is on, the operation mode cannot be changed.2) Parameter settingCheck the Pr. 79 setting.When the Pr. 79 Operation mode selection setting is "0" (initial value), the inverter is placed in externaloperation mode at input power-on. At this time, press on the operation panel (press whenthe parameter unit (FR-PU04/FR-PU07) is used) to switch to PU operation mode.Check that the operation location by Pr. 550 and Pr. 551 is correct.(Refer to page 292)5.5.13 Operation panel (FR-DU07) display is not operatingCheck that the operation panel is connected to the inverter securely.5.5.14 POWER lamp is not litCheck that wiring is securely performed and installation is correct.5.5.15 Parameter write cannot be performedMake sure that operation is not being performed (signal STF or STR is not ON).Make sure that you are not attempting to set the parameter in external operation mode.Check Pr. 77 Parameter write selection.Check Pr. 161 Frequency setting/key lock operation selection.Check that the operation location by Pr. 550 and Pr. 551 is correct.(Refer to page 292)392