YASKAWA CIMR-JA Series Installation & Start-Up Manual page 145

Cause
The forward direction for the motor is setup
incorrectly.
Note: Check the motor specifications for the forward and reverse directions. The motor specifications will vary
depending on the manufacturer of the motor.
n 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.
n Motor is Too Hot
Cause
The load is too heavy.
The air around the motor is too hot.
Insufficient voltage tolerance between
motor phases.
The motor fan has stopped or is clogged.
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
5.8 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
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 S5 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.
When the motor is connected to terminals U/T1, V/T2, and W/T3, 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 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.
Check the motor fan.
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