Yaskawa CIMR-LU Drives - Manual (Page 129)

4 Start-Up Programming & Operation
YASKAWA ELECTRIC TOEP C710616 38F YASKAWA AC Drive L1000A Quick Start Guide 129
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■ Motor is Too Hot
■ Drive Does Not Allow Selection the Desired Auto-Tuning Mode
■ Encoder Offset (E5-11) Set During Auto-Tuning (Rotational or Stationary) Consistently
Differs by 30 Degrees or More.
■ Electrical Noise From Drive or Output Lines When the Drive is Operating
Cause Possible Solutions
The load is too heavy.
If the load is too heavy for the motor, the motor will overheat as it exceeds its rated torque
value for an extended period of time.
Keep in mind that the motor also has a short-term overload rating in addition to the possible
solutions provided below:
• Reduce the load.
• Lower the acceleration and deceleration ramps. (Increase the acceleration time and
deceleration time.)
• Check the values set for the motor protection (L1-01, L1-02) as well as the motor rated
current (E2-01).
• Increase motor capacity.
The air around the motor is too hot.
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
The drive is operating in a vector control mode but
Auto-Tuning has not yet been performed.
• Perform Auto-Tuning.
• Calculate the motor value and reset the motor parameters.
• Change the motor control method to V/f Control (A1-02 = 0).
Insufficient voltage insulation between motor
phases.
When the motor cable is long, high voltage surges occur between the motor coils and drive
switching.
Normally, surges can reach up to three times the drive input power supply voltage.
• Use a motor with a voltage tolerance higher than the max voltage surge.
• Install an AC reactor on the output side of the drive. Make sure the output reactor can
handle frequencies in the range of the drive carrier frequency.
The motor fan has stopped or is clogged. Check the motor fan.
Cause Possible Solutions
The desired Auto-Tuning mode is not available for
the selected control mode. • Check if the desired tuning mode is available for the selected control mode.
• Change the motor control method by setting A1-02.
Cause Possible Solutions
PG-E3 option detected excess position error with
the ERN1387 encoder.
Perform Auto-Tuning of PG-E3 encoder characteristics (T2-01 = 12).
Cause Possible Solutions
PWM switching in the drive generates excessive
noise.
• Lower the carrier frequency (C6-03).
• Install a noise filter on the input side of drive input power.
• Install a noise filter on the output side of the drive.
• Place the wiring inside a metal conduit to shield it from switching noise.
• Ground the drive and motor properly.
• Separate the main circuit wiring and the control lines.
• Make sure wires and the motor have been properly grounded.
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