YASKAWA FSDrive-MV1000 - Drive Does Not Allow Selection of Rotational Auto-Tuning; Motor Stalls During Acceleration or with Large Loads;Acceleration Time Is too Long; Drive Frequency Reference Differs from the Controller Frequency; Reference Command

5.11 Troubleshooting without Fault Display
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions 155
Troubleshooting
5
◆ Drive Does Not Allow Selection of Rotational Auto-Tuning
◆ Motor Stalls During Acceleration or With Large Loads/Acceleration Time is Too
Long
◆ Drive Frequency Reference Differs from the Controller Frequency Reference
Command
Cause Possible Solutions
The desired Auto-Tuning mode is not available for the
selected control mode.
Check to see that the A1-02 (Control Method Selection) is set to “0” (V/f control).
⇒Select the correct control mode at A1-02.
Cause Possible Solutions
Torque limit has been reached or current suppression
keeps the drive from accelerating.
Take the following steps to resolve the problem:
⇒Reduce the load.
⇒Increase motor capacity.
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.
Load is too heavy.
Torque limit is not set properly. Check the torque limit setting.
Frequency reference is too low.
Check the maximum output frequency (E1-04).
⇒Increase E1-04 if it is set too low.
⇒Check U1-01 for proper frequency reference.
⇒Check if a frequency reference switch signal has been set to one of the sequence
input terminals.
⇒If analog input is used, check for a low gain level set for terminal L1 (H3-03).
Load is too heavy.
⇒Reduce the load so that the output current remains within the motor rated current.
Note: In extruder and mixer applications, the load will sometimes
increase as the temperature drops.
⇒Increase the acceleration time.
⇒Check if the mechanical brake is fully releasing as it should.
Acceleration time has been set too long.
Check if the acceleration time parameters have been set too long (C1-01, C1-03,
C1-05, C1-07).
Although the drive is operating in vector motor
control method, Auto-Tuning has not been performed.
⇒Perform Auto-Tuning.
⇒Calculate motor data and reset motor parameters.
⇒Switch to V/f Control (A1-02 = 0).
Incorrect frequency reference setting.
Check the analog input terminal settings.
Analog input terminal L1 is set for frequency gain (H3-02 is set to “1”), but there is
no voltage or current input provided.
⇒Make sure H3-02 is set to the proper values.
⇒See if the analog input value is set to the right value (U1-13).
The Stall Prevention level during acceleration set too
low.
Check the Stall Prevention level during acceleration (L3-02).
If L3-02 is set too low, acceleration may be taking too long.
⇒Increase L3-02.
The Stall Prevention level during run has been set too
low.
Check the Stall Prevention level during run (L3-06).
If L3-06 is set too low, speed will drop as the drive outputs torque.
⇒Increase the setting value.
Drive reached the limitations of the V/f motor control
method.
⇒If the motor cable is long (50 m or more), run Auto-Tuning only for Line-to-Line
Resistance.
⇒Consider switching to vector control mode.
Cause Possible Solutions
The analog input gain and bias for the frequency
reference input are set to incorrect values.
• Check the gain and bias settings for the analog inputs that are used to set the
frequency reference. Check parameters H3-03 and H3-04 for input L1.
• Set these parameters to the appropriate values.
A frequency bias signal is being entered via analog
input terminal L1
The analog input setting (H3-02) is the sum of the individual input values.
⇒Make sure that H3-02 is set appropriately.
⇒Check that the analog input level is appropriate (U1-13).