Yaskawa iQpump Controller User Manual - Manual (Page 152)

6.7 Troubleshooting
152 YASKAWA TM.iQp.06 iQpump Controller User Manual
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.
◆ If the Motor Operates at a Higher Speed than the Speed Command
Use the following information if the motor operates at a higher speed than the Speed Command.
■
A signal is being input to the Speed Command (current) Terminal A2.
If a preset frequency reference is selected, the preset reference takes priority over the normal reference.
If the PI mode of operation is enabled, the iQpump drive output frequency will change to regulate the process variable to the desired
setpoint. Then, the iQpump drive speed may go to maximum.
◆ If the Motor Overheats
Take the following steps if the motor overheats.
■ The load is too high.
If the motor load is too high and the motor is used when the effective torque exceeds the motor's rated torque, the motor will overheat.
Reduce the load amount by either reducing the load or increasing the acceleration / deceleration times. Also consider increasing the
motor size.
■
The ambient temperature is too high.
The motor rating is determined by a particular ambient operating temperature range. The motor will overheat if it is run continuously at
the rated torque in an environment where the maximum ambient operating temperature rating is exceeded. Lower the motor's ambient
temperature to within its acceptable range.