Drive Does Not Allow Selection Of Rotational Auto-Tuning; Motor Hunting Occurs At Low Speeds; Overvoltage Occurs When Running At A Constant Speed - YASKAWA V1000 Series Installation & Start-Up Manual

5.9 Troubleshooting without Fault Display
Cause
Insufficient voltage tolerance between
motor phases.
The motor fan has stopped or is clogged.

Drive Does Not Allow Selection of Rotational Auto-Tuning

■
Cause
The drive is in the incorrect motor control
method for Rotational Auto-Tuning.

Motor Hunting Occurs at Low Speeds

■
Cause
Excessive load inertia in Open Loop
Vector Control.

Overvoltage Occurs When Running at a Constant Speed

■
Cause
Excessive load inertia in Open Loop
Vector Control.
232
When the motor is connected to terminals U/T1, V/T2, and W/T3,
voltage surges occur between the motor coils and drive switching.
Normally, surges can reach up to three times the drive input power supply
voltage (600 V for 200 V class, and 1200 V for 400 V class).
Use a motor with voltage tolerance higher than the max voltage surge.
Use a motor designed to work specifically with a drive when using a 400
V class unit.
Install an AC reactor on the output side of the drive.
Check the motor fan.
• Check if the drive is set to V/f Control by accident (A1-02 = 0).
• Change the motor control method to Open Loop Vector Control
(A1-02 = "2").
• Excess load inertia can cause motor hunting in Open Loop Vector
Control due to slow motor response.
• Increase the speed feedback detection control time constant (n2-02)
from its default value of 50 ms to an appropriate level between 200 and
1000 ms. Adjust this setting in combination with n2-03 (Feedback
Detection Control Time Constant 2).
• Loads with a lot of inertia (fans, etc.) can trigger an overvoltage fault
when operating in Open Loop Vector Control.
• Switch to the V/f motor control method.
• Adjust the values set for the speed feedback detection control time
constant (n2-02, n2-03).
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions