Yaskawa E7 Drive User Manual - Manual (Page 152)

Diagnostic & Troubleshooting 6 - 16
If the Motor Does Not Operate
Use the following information if the motor does not operate.
Ensure the digital operator is securely connected to the Drive.
The motor does not operate when the HAND key on the Digital Operator is pressed.
The following causes are possible:
The Speed Command (Frequency Reference) is too low.
If the Speed Command (frequency reference) is set below the frequency set in E1-09 (Minimum Output Frequency), the Drive
will not operate.
Raise the Speed Command to at least the minimum output frequency.
The motor does not operate when an external run command is input.
The following causes are possible.
The Drive is not in drive mode.
If the Drive is not in drive mode, it will remain in ready status and will not start. Press the MENU key once and press the
DATA/ENTER key. The Drive is now in drive mode.
The Speed Command is too low.
If the Speed Command is set below the frequency set in E1-09 (Minimum Output Frequency), the Drive will not operate. Raise
the Speed Command to at least the minimum output frequency.
The motor stops during acceleration or when a load is connected.
The load may be too high. The Drive has a stall prevention function and an automatic torque boost function, but the motor
responsiveness limit may be exceeded if acceleration is too rapid or if the load is too great. Lengthen the acceleration time
(CI-01) or reduce the load. Also consider increasing the motor size.
The motor only rotates in one direction.
"Reverse run prohibited" may be selected. If b1-04 (Prohibition of Reverse Operation) is set to 1 (reverse run prohibited), the
Drive will not receive reverse run commands. This is the default to use both forward and reverse operation, set b1-04 to 0, and
operate in Auto mode.
The Direction of the Motor Rotation is Reversed
If the motor rotates in the wrong direction, the motor output wiring is incorrect. When the Drive U/T1, V/T2, and W/T3
terminals are properly connected to the motor, the motor operates in a forward direction when a forward run command is
received. The forward direction depends on the manufacturer and the motor type, so be sure to check the specifications.
The direction of rotation can be reversed by switching any two wires among U/TI, V/T2, and W/T3.
TM_E7_01_07182008.book Page 16 Wednesday, July 23, 2008 2:35 PM