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Diagnostics Optimization CT MODBUS RTU Technical Data
264 Installation and System Design Guide
Issue Number: 1
Reported fault Root cause Recommended actions
Motor goes into current
limit following drive
enable
Motor data, symmetrical
current limit
Ensure the motor data has been set-up correctly in the drive and the symmetrical
current limit has also been set-up for the system.
• Refer to Menu B Motor and Symmetrical Current Limit (B16)
Autotune
For a PM motor and operation in RFC-S if the motor goes into current limit on enable
ensure an autotune has been carried out to derive the correct encoder phase angle, or
this has been entered if known.
• Refer to Motor Autotune (B11)
Position feedback
Check the position feedback if this has failed or connected incorrectly the drive will no
longer operate correctly in either RFC-A or RFC-S.
• Refer to Drive Encoder Position (J53) and check connections to drive encoder port.
• Refer to Drive Encoder Feedback Reverse (C12) to change rotation of encoder
feedback where this is connected incorrectly.
Motor rated speed “slip”
incorrect (Open loop vector,
RFC-A)
The motor is unable to reach the demanded speed due to a limitation in output torque,
current limit operation as a result of the incorrect rated speed “slip”
• Manually adjust the rated speed to achieve the maximum torque in Torque
Producing Current (J24) (Open loop)
• Tune the rated speed to achieve the maximum torque using Motor Parameter
Adaptive Control (B25) (RFC-A)
Motor, motor connection fault
Check the connections from the drive output to the motor including the output motor
contactors and any shorting contactor which may be used.
Reported fault Root cause Recommended actions
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