Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 152)

152 Rockwell Automation Publication 520-UM001G-EN-E - September 2014
Chapter 4 Troubleshooting
Drive does not respond to changes in speed command.
Motor and/or drive will not accelerate to commanded speed.
Motor operation is unstable.
Drive will not reverse motor direction.
Cause(s) Indication Corrective Action
No value is coming from the source of the command. The drive “Run” indicator is
lit and output is 0 Hz. • Check b012 [Control Source] for correct source.
• If the source is an analog input, check wiring and use a meter to check for presence of
signal.
• Check b002 [Commanded Freq] to verify correct command.
Incorrect reference source is being selected by remote device or
digital inputs. None • Check b012 [Control Source] for correct source.
• Check b014 [Dig In Status] to see if inputs are selecting an alternate source. Verify
settings for t062 , t063 , t065 - t068 [DigIn TermBlk xx].
• Check P047 , P049 , P051 [Speed Referencex] for the source of the speed reference.
Reprogram as necessary.
• Review the Speed Reference Control chart on page 46 .
• Verify communications if used.
Cause(s) Indication Corrective Action
Acceleration time is excessive. None Reprogram P041 , A442 , A444 , A446 [Accel Time x].
Excess load or short acceleration times force the drive into
current limit, slowing or stopping acceleration. None • Compare b003 [Output Current] with A484 , A485 [Current Limit x].
• Remove excess load or reprogram P041 , A442 , A444 , A446 [Accel Time x].
• Check for improper A530 [Boost Select] setting.
Speed command source or value is not as expected. None • Verify b002 [Commanded Freq].
• Check b012 [Control Source] for the proper Speed Command.
Programming is preventing the drive output from exceeding
limiting values. None • Check P044 [Maximum Freq] to ensure that speed is not limited by programming.
• Verify programming of A572 [Speed Ratio].
Torque performance does not match motor characteristics. None • Set motor nameplate full load amps in parameter P034 [Motor NP FLA].
• Perform P040 [Autotune] “Static Tune” or “Rotate Tune” procedure.
• Set P039 [Torque Perf Mode] to 0 “V/Hz”.
Cause(s) Indication Corrective Action
Motor data was incorrectly entered. None 1. Correctly enter motor nameplate data into P031 , P032 and P033 .
2. Enable A547 [Compensation].
3. Use A530 [Boost Select] to reduce boost level.
Cause(s) Indication Corrective Action
Reverse is disabled. None Check A544 [Reverse Disable].
Digital input is not selected for reversing control. None Check [DigIn TermBlk xx] (See page 82 ). Choose correct input and program for reversing
mode.
Digital input is incorrectly wired. None Check input wiring (See page 42 ).
Motor wiring is improperly phased for reverse. None Switch two motor leads.