Troubleshooting
4-30
Part 1105779-04
E 2014 Nordson Corporation
CorrectionCauseProblem
Reciprocator measured
travel position does not
match the value shown
on the reciprocator
control panel or
configuration screen
Reciprocator not homed. Touch the Home button and wait for the
homing sequence to finish, then check the
position accuracy. The displayed position will
not be correct until the reciprocator is homed.
Incorrect reciprocator
encoder value entered.
The accuracy of the displayed position versus
the actual position of the reciprocator is
determined by the configured encoder
resolution. Check the encoder resolution
value.
Belt drive sprocket slipping. Make sure the drive belt sprocket is securely
connected to the gear reducer output shaft.
Reciprocator does not
move in response to
move command
Refer to condition “No movement from reciprocator in response to move
command.”
Mechanical failure, drive belt
not engaging drive sprocket,
or drive sprocket slipping.
The position value changes but the
reciprocator does not move. This can occur
because the encoder is connected directly to
the gear reducer output shaft. Check the
drive belt and sprocket.
Incorrect reciprocator speed
controller parameters.
Speed controller parameters must be set to
specified values in order to respond correctly
to signals from reciprocator controller. Refer
to the In/Out Positioner/Reciprocator Control
Panel drawings in Section 7 of this manual.
No reciprocator
response when Auto
mode selected
Refer to condition “No reciprocator response when Auto mode selected.”
Auto cycle delay in progress A 5 second delay occurs when Auto mode is
selected. During the delay a warning beeper
should sound.
An end-of-travel limit switch
is engaged.
Check the iControl Alarm log. Identify the
fault and review the fault troubleshooting
information.
Invalid reciprocator stroke
settings.
Speed controller parameters must be set to
accept commands from the reciprocator
controller. Refer to the In/Out
Positioner/Reciprocator Control Panel
drawings in Section 7 of this manual.
Reciprocator “jumps”
back to a stop after
moving to a new
position
Reciprocator Hysteresis
value too small.
Open Reciprocator Configuration screen and
increase the Hysteresis value.
The hysteresis value is the allowable over- or
under-shoot distance from the target position.
If the reciprocator is within this distance of the
desired position when it stops, the iControl
system will not move it again to the target
position. If the value is not large enough, the
reciprocator will over- or under-shoot its
destination and then “jump” back to it (called
hunting).
A typical setting is 0.5 − 0.7 inches depending
on the reciprocator speed setting.
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