Motor Is Too Hot; Drive Does Not Allow Selection The Desired Auto-Tuning Mode; Ope02 Error Occurs When Lowering The Motor Rated Current Setting; Motor Stalls During Acceleration Or Acceleration Time Is Too Long - YASKAWA A1000 Series Technical Manual

6.10 Troubleshooting without Fault Display
Cause
The motor is running at almost 0 Hz and the Speed Search estimated
the speed to be in the opposite direction.
Note: Check the motor specifications for the forward and reverse directions. The motor specifications will vary depending on the
manufacturer of the motor.
Motor Rotates in One Direction Only
■
Cause
The drive prohibits reverse rotation.
A Reverse run signal has not been entered, although 3-wire
sequence is selected.

◆ Motor is Too Hot

Cause
The load is too heavy.
The air around the motor is too hot.
The drive is operating in a vector control mode but Auto-Tuning has
not yet been performed.
Insufficient voltage insulation between motor phases.
The motor fan has stopped or is clogged.

◆ Drive Does Not Allow Selection the Desired Auto-Tuning Mode

Cause
The desired Auto-Tuning mode is not available for the selected
control mode.

◆ oPE02 Error Occurs When Lowering the Motor Rated Current Setting

Cause
Motor rated current and the motor no-load current setting in the
drive are incorrect.

◆ Motor Stalls during Acceleration or Acceleration Time is Too Long

Cause
Torque limit has been reached or current suppression keeps the drive
from accelerating.
Load is too heavy.
Torque limit is not set properly.
Frequency reference is too low.
Load is too heavy.
Acceleration time has been set too long.
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• Disable bi-directional search (b3-14 = "0") so that Speed Search is performed only in the specified direction.
• Check parameter b1-04.
• Set the drive to allow the motor to rotate in reverse (b1-04 = 0).
• Make sure that one of the input terminals S3 to S8 used for the 3-wire sequence has been set for reverse.
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.
• Increase the acceleration and deceleration times.
• Check the values set for the motor protection (L1-01, L1-02) as well as the motor rated current (E2-01).
• Increase motor capacity.
• Check the ambient temperature.
• Cool the area until it is within the specified temperature range.
• Perform Auto-Tuning.
• Calculate the motor value and reset the motor parameters.
• Change the motor control method to V/f Control (A1-02 = 0).
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 (600 V for 200 V class, and 1200 V
for 400 V class).
• Use a motor with a voltage tolerance higher than the max voltage surge.
• Use a motor designed to work specifically with a drive when using a 400 V class unit.
• Install an AC reactor on the output side of the drive. The carrier frequency should be set to 2 kHz when installing
an AC reactor.
Check the motor fan.
• Check if the desired tuning mode is available for the selected control mode. Refer to
• Change the motor control method by setting A1-02.
• The user is trying to set the motor rated current in E2-01 to a value lower than the no-load current set in E2-03.
• Make sure that value set in E2-01 is higher than E2-03.
• If it is necessary to set E2-01 lower than E2-03, first lower the value set to E2-03, then change the setting in E2-01
as needed.
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.
Check the torque limit setting.
• 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, A2, or A3 (H3-03, H3-11, H3-07).
• 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.
• Increase the acceleration time.
• Check if the mechanical brake is fully releasing as it should.
Check if the acceleration time parameters have been set too long (C1-01, C1-03, C1-05, C1-07).
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Auto-Tuning on page 109.