Nordson Encore HD iControl System, Hardware Manual

Page: 61 / 93

Troubleshooting
4-21
Part 1603054-02
E 2015 Nordson Corporation
Correction Cause Problem
Auto mode is selected,
in/out positioner stays
at the reverse limit
position.
Refer to Problem “Auto mode is selected, homing has completed, but no auto
positioning response from in/out positioner.“
Park/Clean and Retract
position values set too high.
Set the Park/Clean and Retract position
values to less than reverse limit switch
position value. If the values are greater, the
in/out positioner will stop at the reverse limit
switch and generate a fault condition during
normal operation.
NOTE: If the in/out positioner is an analog
version, then the Reverse Limit value must
equal the position at the reverse limit switch.
Unwanted movement
as In/Out Positioner
“hunts” for the target
position.
In/Out Positioner Hysteresis
value too small.
Open In/Out Positioner Configuration screen
and increase the Hysteresis value.
The hysteresis value is the allowable over- or
under-shoot distance from the target position.
If the in/out positioner is within this distance of
the desired position when it stops, the iControl
system will not attempt to move to the target
position. If this value is not large enough, the
in/out positioner will “hunt” for the position,
causing unwanted motion.
A typical setting is 0.5
− 0.7 inches depending
on the in/out positioner speed setting.
In/Out Positioner actual
travel distance does not
match value shown on
iControl screens.
In/Out Positioner position
calibration not completed, or
in/out positioner forward or
reverse limit switch moved
since last position calibration.
In/Out Positioner calibration involves moving
the in/out positioner to a stop at the forward
limit switch and then within 60 seconds
moving it to the reverse limit switch. This sets
zero at the forward limit switch and a reverse
limit reference at the reverse limit switch.
Calibration is performed during in/out
positioner configuration, but can be performed
at any time while in Manual mode.
If the physical position of either limit switch
has been changed, then positioning will be
incorrect. You must recalibrate the in/out
positioner if you move the limit switches.
NOTE: The first time Auto mode is selected
after in/out positioner power up, the in/out
positioner moves to the reverse limit switch
(home) and acquires a reverse reference
value. This value is used to reset the in/out
positioner position for Auto operations.
Continued...
Obsolete