5-2 Troubleshooting 5-2 Troubleshooting 5 Maintenance Operations 5-5 Situation Possible cause Remedy The motor doesn't work. No voltage observed for Inverter outputs U/T1, V/T2, and W/T3. • Is the A001 setting (frequency reference selection) correct? • Is the A002 setting (RUN command selection) correct? • Check the A001 setting. • Check the A002 setting. • Is power supplied to terminals R/L1, S/L2, and T/L3? If so, the POWER LED indicator should light up. • Check the connections of terminals R/L1, S/L2, T/L3 and U/T1, V/T2, W/T3. • Turn on the power. • Does the display show "E **"? • Press the Mode key to confirm the status, and then reset.
• Is the allocation of the multi-function input correct? • Is the RUN key (RUN command) turned on? • Are FW (or RV) input and terminal SC or PSC connected? • Check the allocation of the multi- function inputs: C001 to C005 • Turn on the RUN key (RUN command). • Connect FW (or RV) input to terminal SC or PSC. • Is the frequency set with F001 selected? • Is the potentiometer connected to terminals FS/FV/FC? • Press the key to set the frequency. • If terminal mode is selected, set the potentiometer to FS/FV/FC. • Are RS and FRS inputs still turned on? • Turn off these inputs. Voltage observed for Inverter outputs U/T1, V/T2, and W/T3. • Is the motor restrained? • Or is it overloaded?
• Release the restraint and reduce the load. • Operate the motor separately. Motor rotation is in reverse. • Are output terminals U/T1, V/T2, and W/T3 correct? • Is the phase sequence of the motor U/T1, V/T2, W/T3, and is the rotation in forward or reverse? • Connect according to the motor phase sequence. (Generally, the sequence is U/T1, V/T2, and W/T3 in forward.) • Is the control circuit terminal correct? • Is F004 set correctly in the motor rotation direction selection via the Digital Operator? • Select FW for forward and RV for reverse. Motor rotation speed does not rise. • Does not rise even after the frequency setting unit is turned on with correct wiring.
• Replace the frequency setting unit. • Is the motor overloaded? • Reduce the load. • Motor rpm becomes lower than the set value due to the limit function if overloaded.