Motor Is Too Hot - YASKAWA U1000 Series Technical Manual

6.10 Troubleshooting without Fault Display
Motor Rotates in the Opposite Direction from the Run Command

Cause
Phase wiring between the drive and motor is incorrect.
The forward direction for the motor is setup incorrectly.
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.
Carrier frequency is too low.
 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.
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• Check the motor wiring.
• Switch two motor cables (U, V, and W) to reverse motor direction.
• Connect drive output terminals U/T1, V/T2, and W/T3 in the right order to match motor terminals U, V, and W.
• Change the setting of parameter b1-14.
Typically, forward is designated as being counterclockwise when looking from the motor shaft (see figure below).
1. Forward Rotating Motor (looking down the motor shaft)
2. Motor Shaft
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.
Check the motor fan.
Increase the carrier frequency to lower the current harmonic distortion and lower the motor temperature.
• Check if the desired tuning mode is available for the selected control mode. Refer to Auto-Tuning on page 116.
• 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.
YASKAWA ELECTRIC SIEP C710636 03A YASKAWA U1000 Technical Manual
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