Rockwell Automation 20B PowerFlex 700 Installation Instructions - Frames 0…6 - Manual (Page 75)

Rockwell Automation Publication 20B-IN019E-EN-P - July 2013 75
PowerFlex 700 Adjustable Frequency AC Drive – Frames 0…6
Motor and/or drive do not accelerate to commanded speed.
Motor operation is unstable.
Drive does not reverse motor direction.
Stopping the drive results in a Decel Inhibit fault.
Cause(s) Indication Corrective Action
Acceleration time is excessive. None Reprogram [Accel Time x].
Excess load or short acceleration times force
the drive into current limit, slowing or
stopping acceleration. None Check [Drive Status 2], bit 10 to see if the
drive is in Current Limit.
Remove excess load or reprogram [Accel
Time x].
Speed command source or value is not as
expected. None Check for the proper Speed Command by
using Steps 1 through 7 above.
Programming is preventing the drive output
from exceeding limiting values. None Check [Maximum Speed] and [Maximum
Freq] (parameters 082 and 055) to assure
that speed is not limited by programming.
Cause(s) Indication Corrective Action
Motor data was incorrectly entered or Autotune
was not performed. None 1. Correctly enter motor nameplate data.
2. Perform “Static” or “Rotate” Autotune
procedure.
Cause(s) Indication Corrective Action
Digital input is not selected for reversing
control. None Check [Digital Inx Sel]. Choose correct
input and program for reversing mode.
Digital input is incorrectly wired. None Check input wiring.
Direction mode parameter is incorrectly
programmed. None Reprogram [Direction Mode] for analog
“Bipolar” or digital “Unipolar” control.
Motor wiring is improperly phased for reverse. None Switch two motor leads.
A bipolar analog speed command input is
incorrectly wired or signal is absent. None 1. Use meter to check that an analog
input voltage is present.
2. Check wiring.
Positive voltage commands forward
direction. Negative voltage commands
reverse direction.
Cause(s) Indication Corrective Action
The bus regulation feature is enabled and is
halting deceleration due to excessive bus
voltage. Excess bus voltage is normally due to
excessive regenerated energy or unstable AC
line input voltages.
Internal timer has halted drive operation. Decel Inhibit fault screen.
LCD Status Line indicates
“Faulted”. 1. See Attention statement on page 6 .
2. Reprogram parameters 161/162 to
eliminate any “Adjust Freq” selection.
3. Disable bus regulation (parameters 161 &
162) and add a dynamic brake.
4. Correct AC input line instability or add an
isolation transformer.
5. Reset drive.