YASKAWA FSDrive-MV1000 - Motor Is too Hot

5.11 Troubleshooting without Fault Display
154 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
■ Motor Rotates in the Opposite Direction from the Run Command
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
◆ Motor is Too Hot
Cause Possible Solutions
Phase wiring between the drive and motor is incorrect.
Check the motor wiring.
⇒Switch two motor cables (U, V, and W) to reverse motor direction.
⇒Connect drive output terminals U, V, and W in the right order to match motor
terminals U, V, and W.
The connection is incorrect between the drive’s
control circuit terminals (forward/reverse) and
forward/reverse signals of control panel.
Check to see the wiring of control circuit.
⇒Correct the wiring.
The forward direction for the motor is setup
incorrectly.
⇒Connect the drive’s output terminals (U, V, and W) and motor terminals (U, V,
and W) properly.
⇒When the wiring is correct, exchange two of cables U, V, and W connected to the
motor.
The motor is running at almost 0 Hz and the Speed
Search estimated the speed to be in the opposite
direction.
⇒Disable bi-directional search (b3-14 = “0”) so that Speed Search is performed
only in the specified direction.
Cause Possible Solutions
The drive prohibits reverse rotation.
Check parameter b1-04.
⇒Set the drive to allow the motor to rotate in reverse (b1-04 = 0).
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.
Note: 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.
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 a motor is connected to the drive output terminals (U, V, W), a surge voltage
is generated between the drive’s switching and motor’s winding coil. Generally, the
maximum surge voltage is about 1.5 times the Power Cell input power supply
voltage (1500 V with a 1200 V input).
⇒Use a motor with a voltage tolerance higher than the max voltage surge.
The motor fan has stopped or is clogged. Check the motor fan.
2
1
1 Typically, forward is designated as being
counterclockwise when looking from the motor shaft.
2 Motor Shaft