Allen-Bradley PowerFlex 70 User Manual page 87

Drive does not Start from HIM.
Cause(s)
Drive is programmed for 2 wire
control. HIM Start button is
disabled for 2 wire control.
Drive does not respond to changes in speed command.
Cause(s)
No value is coming from the
source of the command.
Incorrect reference source has
been programmed.
Incorrect Reference source is
being selected via remote
device or digital inputs.
Motor and/or drive will not accelerate to commanded speed.
Cause(s)
Acceleration time is excessive. None
Excess load or short
acceleration times force the
drive into current limit, slowing
or stopping acceleration.
Speed command source or
value is not as expected.
Programming is preventing the
drive output from exceeding
limiting values.
Indication
None
Indication
LCD HIM Status Line indicates
"At Speed" and output is 0 Hz.
None
None
Indication
None
None
None
Troubleshooting
Corrective Action
If 2 wire control is required, no
action is necessary.
If 3 wire control is required, program
[Digital Inx Sel] for correct inputs.
(See page 3-35)
Corrective Action
1. If the source is an analog input,
check wiring and use a meter to
check for presence of signal.
2. Check [Commanded Freq] for
correct source. (Param #002,
page 3-8)
3. Check [Speed Ref Source] for
the source of the speed
reference. (Param #213, page
3-24)
4. Reprogram [Speed Ref A Sel] for
correct source.
(Param #090, page 3-13)
5. Check [Drive Status 1], bits 12
and 13 for unexpected source
selections. (Param #209, page
3-23)
6. Check [Dig In Status] to see if
inputs are selecting an alternate
source. (Param #216, page 3-25)
7. Reprogram digital inputs to
correct "Speed Sel x" option.
(See page 3-35)
Corrective Action
Reprogram [Accel Time x].
(See page 3-17)
Check [Drive Status 2], bit 10 to see
if the drive is in Current Limit.
(See page 3-23)
Remove excess load or reprogram
[Accel Time x].
(See page 3-17)
Check for the proper Speed
Command using Steps 1 through 7
above.
Check [Maximum Speed]
#082, page 3-12) and [Maximum
Freq] (Param #055, page 3-10)
insure that speed is not limited by
programming.
4-11
(Param
to