Common Symptoms and Corrective Actions

These are symptoms you may experience with your drive and corrective actions to take.

Drive Does Not Start from Inputs Wired to the Terminal Block

Cause(s)
Indication
Corrective Action
Drive is faulted
Flashing red status indicator
Clear fault.
  • Press Stop
  • Cycle power
  • ‘Clear Faults’ on the HIM Diagnostic menu
Incorrect input wiring. See publication 750-IN111, for wiring examples.
  • 2-wire control requires Run, Run Forward, Run Reverse, or Jog input
  • 3-wire control requires Start and Stop inputs
  • Verify 24 Volt Common is connected to Digital Input Common
None
Wire inputs correctly.
Incorrect digital input programming.
  • Mutually exclusive choices have been made (for example, Jog and Jog Forward)
  • 2-wire and 3-wire programming may be conflicting
  • Start configured without a Stop configured
None
Configure input function.
Flashing yellow status indicator and ‘DigIn Cnfg B’ or ‘DigIn Cnfg C’ indication on LCD HIM.
10:355 [Motor Side Sts 2] shows type 2 alarm(s).
Resolve input function conflicts.
Terminal block does not have control.
None
Check 0:41 [Logic Mask].

Drive Does Not Start from HIM

Cause(s)
Indication
Corrective Action
Drive is configured for 2-wire level control.
None
Change 0:101 [Digital In Cfg] to correct control function.
Another device has Manual control.
None
—
Port does not have control.
None
Change 0:41 [Logic Mask] to enable correct port.

Drive Does Not Respond to Speed Command

Cause(s)
Indication
Corrective Action
No value is coming from the source of the command.
LCD HIM Status Line indicates ‘At Speed’ and output is 0 Hz.
If the source is an analog input, check wiring and use a meter to check for presence of signal.
Incorrect reference source has been programmed.
None
  • Check 10:1800 [VRef A Sel] for the source of the speed reference
  • Reprogram 10:1800 [VRef A Sel] for correct source
Incorrect Reference source is being selected via remote device or digital inputs.
None
  • Check 10:354 [Motor Side Sts 1], bits 12 and 13 for unexpected source selections
  • Check 0:100 [Digital In Sts], to see if inputs are selecting an alternate source
  • Check configuration of 173…175 [DI Speed Sel n] functions

Motor or Drive Does Not Accelerate

Cause(s)
Indication
Corrective Action
Acceleration time is excessive.
None
Reprogram 10:1915/ 1916 [VRef Accel Timen].
Excess load or short acceleration times force the drive into current limit, slowing or stopping acceleration.
None
Check 10:354 [Motor Side Sts 1], bit 27 to see if the drive is in Current Limit. Remove excess load or reprogram 10:1915/1916 [VRef Accel Timen].
Speed command source or value is not as expected.
None
Check for the proper Speed Command using Steps 1 through 7 above.
Programming is preventing the drive output from exceeding limiting values.
None
Check 10:1898 [Vel Limit Pos], 10:1899 [Vel Limit Neg], and 10:422 [Maximum Freq] to assure that speed is not limited by programming.

Motor Operation Is Unstable

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 Tune’ or ‘Rotate Tune’ Autotune procedure. See parameter 10:910 [Autotune].

Drive Does Not Reverse Motor Direction

Cause(s)
Indication
Corrective Action
Digital input is not selected for reversing control.
None
Check that the DI Reversing function is correctly configured.
Digital input is incorrectly wired.
None
Check digital input wiring.
Direction mode parameter is incorrectly programmed.
None
Reprogram 10:930 [Direction Mode], for analog ‘Bipolar’ or digital ‘Unipolar’ control.
Motor wiring is improperly phased for reverse.
None
Switch any 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 bipolar analog signal wiring. Positive voltage commands forward direction. Negative voltage commands reverse direction.

Drive Stop Results in Decel Inhibit Fault

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.
Decel Inhibit fault screen. LCD Status Line indicates ‘Faulted.’
  1. Reprogram parameters 10:116/117 [Bus Reg Mode n] to eliminate any ‘Adjust Freq’ selection.
  2. Disable bus regulation (parameters 10:116/117 [Bus Reg Mode n]) and add a dynamic brake.
  3. Correct AC input line instability or add an isolation transformer.
  4. Access 10:170 [Dec Inhibit Actn] to select desired fault action.
  5. Reset drive.
Internal timer has halted drive operation.

Datalink Problems

Cause(s)
Indication
Corrective Action
Another device is communicating with the processor.
None
  • Verify that a PLC is not communicating with the drive.
  • Disconnect communication cable or inhibit communication in PLC software.
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