Motor Rotates In One Direction Only; Motor Is Too Hot - YASKAWA V1000 Series Installation & Start-Up Manual

Cause
The forward direction for the motor is
set-up 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.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
5.9 Troubleshooting without Fault Display
Possible Solutions
• Typically, forward is designated as being counterclockwise when
looking from the motor shaft (refer to the 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.
Possible Solutions
• 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 S7 used for the 3-wire
sequence has been set for reverse.
Possible Solutions
• 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").
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