n
Motor Stalls During Acceleration or With Large Loads
Cause Possible Solutions
Load is too heavy.
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.
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Motor Will Not Accelerate or the Acceleration Time is Too Long
Cause Possible Solutions
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 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).
Load is too heavy.
• 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.
The torque limit function is
operating in Open Loop Vector
Control.
• Check the torque limit setting. It may be too low. (L7-01 through L7-04).
• Reset the torque limit to its default value (200%).
Acceleration time has been set
too long.
Check if the acceleration time parameters have been set too long (C1-01, -03, -05, -07).
Motor characteristics and drive
parameter settings are
incompatible with one another in
V/f Control.
• Set the correct V/f pattern so that it matches the characteristics of the motor being used.
• Check E1-03 (V/f Pattern Selection).
The right combination of motor
characteristics have not been set
in Open Loop Vector Control.
Execute Rotational Auto-Tuning.
Incorrect frequency reference
setting.
• 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).
The Stall Prevention level during
acceleration and deceleration set
too low.
• 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.
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.
Although the drive is operating in
Open Loop Vector motor control
method, Auto-Tuning has not
been performed.
• Perform Auto-Tuning.
• Calculate motor data and reset motor parameters.
• Switch to the V/f motor control method (A1-02 = “0”).
Drive reached the limitations of
the V/f motor control method.
• The motor cable may be long enough (over 50 m) to require Auto-Tuning for line-to-line resistance.
• Be aware that V/f Control is comparatively limited when it comes to producing torque at low speeds.
• Consider switching to Open Loop Vector Control.
n
Drive Frequency Reference Differs from the Controller Frequency Reference Command
Cause Possible Solutions
The analog input frequency gain and bias are set to
incorrect values.
• Check the main speed frequency reference terminal input gain level assigned to terminals
A1 and A2, as well as the frequency reference input bias to terminals A1 and A2 (parameters
H3-03, H3-04, and H3-12).
• Set these parameters to the appropriate values.
A frequency bias signal is being entered via analog
input terminals A1 or A2.
• If multi-function analog input terminals A1 and A2 are set for frequency reference (H3-02
= 0 and H3-10 = 0), the addition of both signals builds the frequency reference.
• Ensure that H3-02 and H3-10 are set appropriately.
• Check the input level set for terminals A1 and A2 (U1-13, U1-14).
6.9 Troubleshooting without Fault Display
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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Troubleshooting
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