Rockwell Automation MD65 User Manual Version 2.0 - Manual (Page 116)

10-10 MD65 AC Drive User Manual
10.2.5 Problem: Motor and/or Drive Will Not
Accelerate to Commanded Speed
10.2.6 Problem: Motor Operation is Unstable
Table 10.5 – Problem: Motor and/or Drive Will Not Accelerate to Commanded Speed
Cause(s) Indication Corrective Action
Acceleration time is
excessive. None Reprogram P039 (Accel Time
1) or A067 (Accel Time 2).
Excess load or short
acceleration times force the
drive into current limit,
slowing or stopping
acceleration. None • Compare Output Current
(d003) with Current Limit
(A089).
• Remove excess load or
reprogram Accel Time 1
(P039) or Accel Time 2
(A067).
• Check for improper Boost
Select (A084) setting.
Speed command source or
value is not as expected. None • Verify Commanded Freq
(d002).
• Check Control Source
(d012) for the proper Speed
Command.
Programming is preventing
the drive output from
exceeding limiting values. None Check Maximum Freq (P035)
to ensure that speed is not
limited by programming.
Torque performance does
not match motor
characteristics. None • Set motor nameplate full
load amps in Motor NP FLA
(A126).
• Perform Autotune
procedure (A127 = Static
Tune or Rotate Tune).
• Set Torque Perf Mode
(A125) to 0 = V/Hz.
Table 10.6 – Problem: Motor Operation is Unstable
Cause(s) Indication Corrective Action
Motor data was incorrectly
entered. None 1. Correctly enter motor
nameplate data into P031,
P032, and P033.
2. Enable Compensation
(A097).
3. Use Boost Select (A084) to
reduce boost level.