Motor Stalls During Acceleration Or With Large Loads; Motor Will Not Accelerate Or The Acceleration Time Is Too Long - YASKAWA V1000 Series Installation & Start-Up Manual

Motor Stalls During Acceleration or With Large Loads

■
Cause
Load is too heavy.

Motor Will Not Accelerate or the Acceleration Time is Too Long

■
Cause
Frequency reference is too low.
Load is too heavy.
The torque limit function is operating in
Open Loop Vector Control.
Acceleration time has been set too long.
Motor characteristics and drive parameter
settings are incompatible with one
another in V/f Control.
The right combination of motor
characteristics have not been set in Open
Loop Vector Control.
Incorrect frequency reference setting.
The Stall Prevention level during
acceleration and deceleration set too low.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
5.9 Troubleshooting without Fault Display
Possible Solutions
• Take the following steps to resolve the problem:
• Reduce the load.
• Increase the acceleration time.
• Increase motor capacity.
• 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.
Possible Solutions
• 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 signal switch has been set to one of the
multi-function input terminals.
Check for low gain level set to terminals A1 or A2 (H3-03, H3-11).
• Reduce the load so that the output current remains within the
motor-rated current.
• In extruder and mixer applications, the load will sometimes increase as
the temperature drops.
Check if the mechanical brake is fully releasing as it should.
• Check the torque limit setting. It may be too low. (L7-01 through L7-
04).
• Reset the torque limit to its default value (200%).
Check if the acceleration time parameters have been set too long (C1-01,
-03, -05, -07).
• Select the correct V/f pattern so that it matches the characteristics of the
motor being used.
• Check E1-03 (V/f Pattern Selection).
Execute Rotational Auto-Tuning.
• Check the multi-function analog input settings.
• Check if multi-function analog input terminal A1 or A2 is set for
frequency gain (H3-02 or H3-10 = "1"). If so, the frequency reference
will be 0 if there is no voltage (current) input provided.
• Ensure H3-02 and H3-10 are set to the proper values.
• Ensure the analog input value is set to the right value (U1-13, U1-14).
• Check the Stall Prevention level during acceleration (L3-02).
• If L3-02 is set too low, acceleration will take a fair amount of time.
• Increase L3-02.
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