YASKAWA V1000 Series Installation & Start-Up Manual page 253

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 is set too
low.
The Stall Prevention level during run has
been set too low.
The drive is operating in Open Loop
Vector motor control method, although
Auto-Tuning has not been performed.
Drive reached the limitations of the V/f
motor control method.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
5.10 Detailed Troubleshooting
Possible Solutions
• Check the maximum output frequency (E1-04).
• Increase E1-04 if it is set too low.
Check U1-01 to see if the frequency reference is being input properly.
Check if a frequency reference signal switch has been set to one of the
multi-function input terminals.
Check if the gain level set to terminals A1 or A2 is too low (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.
• 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.
• 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.
• Perform Auto-Tuning.
• Calculate motor data and reset motor parameters.
• Switch to the V/f motor control method (A1-02 = "0").
• V/f Control is comparatively limited when it comes to producing torque
at low speeds.
• Consider switching to Open Loop Vector Control.
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