Yaskawa iQpump Drive User Manual - Manual (Page 150)

6.7 Troubleshooting
150 YASKAWA TM.iQp.01 iQpump Drive User Manual
◆ 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 iQpump 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 iQpump 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 iQpump drive is not in drive mode.
If the iQpump 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 iQpump 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 iQpump 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 iQpump 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 (C1-01, C1-03,
or C1-05) or reduce the load. Also consider increasing the motor size.
◆ The Direction of the Motor Rotation is Reversed
If the motor rotates in the wrong direction, the motor output wiring is incorrect. When the iQpump 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.
◆ If the Motor Does Not Put Out Torque or If Acceleration is Slow
Use the following information if the motor does not output torque or if acceleration is too slow.
■
The stall prevention level during acceleration is too low.
If the value set for L3-02 (Stall Prevention Acceleration Level) is too low, the acceleration time will be too long. Check to be sure that the
set value is suitable.
■
The stall prevention level during running is too low.
If the value set for L3-06 (Stall Prevention Level during Running) is too low, the motor speed and torque will be limited. Check to be sure
that the set value is suitable.