Drive Does Not Allow Selection Of The Desired Auto-Tuning Mode; Motor Stalls During Acceleration Or Accel/Decel Time Is Too Long - YASKAWA GA700 Technical Manual

6.10 Troubleshooting without Fault Display
Cause
Insufficient voltage insulation between motor phases.
The air around the motor is too hot.
The motor fan has stopped or is clogged.
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Drive Does Not Allow Selection of the Desired Auto-Tuning Mode

Cause
The desired Auto-Tuning mode is not available for the
selected control mode.
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Motor Stalls during Acceleration or Accel/Decel Time is Too Long

Cause
Torque limit has been reached or current suppression keeps
the drive from accelerating.
Torque limit is not set properly.
Acceleration time has been set too short.
The load is too heavy.
The frequency reference is low.
Incorrect frequency reference setting.
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• Use a motor with a voltage tolerance higher than the maximum voltage
surge.
• Use a drive dedicated motor rated for use with AC drives when using the
motor on drives rated higher than 400 V class.
• Install an AC reactor on the output side of the drive and set C6-02 = 1
[Carrier Frequency Selection = 2.0 kHz].
Note:
When the motor is connected to the drive output terminals (UT/1, V/T2,
and W/T3), surges occur between the drive switching and the motor
coils. Normally, surges can reach up to three times the drive input power
supply voltage (600 V for a 200 V class drive, 1200 V for a 400 V class
drive).
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
• Clean the motor fan.
• Improve the surrounding environment.
• Check if the desired tuning mode is available for the selected control
mode.
• Change the motor control method by setting A1-02 [Control Method
Selection].
• Reduce the load.
• Use a larger motor.
Note:
Although the drive has a Stall Prevention function and a Torque
Compensation Limit function, accelerating too quickly or trying to drive
an excessively large load can exceed the capabilities of the motor.
Check the torque limit setting.
Check the value set in C1-01, C1-03, C1-05, or C1-07 [Acceleration Time]
and set them to appropriate values.
• Increase the acceleration time.
• Check if the mechanical brake is fully releasing as it should.
• Reduce the load so that the output current remains within the motor rated
current.
• Use a larger motor.
Note:
• In extruder and mixer applications, the load will sometimes increase as
the temperature drops.
• Although the drive has a Stall Prevention function and a Torque
Compensation Limit function, accelerating too quickly or trying to
drive an excessively large load can exceed the capabilities of the motor.
• Check E1-04 [Maximum Output Frequency] and increase the setting if it
is set too low.
• Check U1-01 [Freq Reference] for proper frequency reference.
• Check if a frequency reference signal switch has been set to one of the
multi-function input terminals.
• Check for low gain level set to H3-03, H3-11, H3-07 [Terminal A1, A2,
A3 Input Gain].
If H3-02, H3-10, H3-06 = 1 [MFAI Function Select = Frequency Gain] has
been set, check whether voltage (current) has been set.
• Check the values set in H3-02, H3-10, and H3-06.
• Check if the analog input values assigned to terminals A1, A2, and A3
are appropriate using U1-13 to U1-15 [Terminal A1, A2, A3 Input
Voltage].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
Possible Solution
Possible Solution