Troubleshooting
The following checklist has been provided to assist in the analysis and repair of potential trouble
situations with the Digital Line Guide. If a situation occurs that is not described in this list, contact
AccuWeb for assistance.
Problem Solution
The display does not display any characters. Check item 1 in the table
below.
The display is active but the keys do not work. Check item 2 in the table
below.
The system does not respond to parameter changes entered
through the Digital Line Guide keypad.
Check item 1 in the table
below.
The display shows “EEPROM error – Set defaults.” Check item 3 in the table
below.
The display shows “Serial i/o error.” Check item 1 in the table
below.
The sensor does not follow the line or edge. Check item 4 in the table
below.
The guide steers the web away from the sensor. Check item 5 in the table
below.
Item Description / Repair Procedure
Bad cable connection. If the display is not working, check the interface
cable and replace if bad.
1
Keypad is disabled. Refer to page 2 78 for more information about this
feature.
Non-volatile memory contains bad data. Reset all parameters to their
default values:
3
To reset all parameters to their default values, pre
ss and hold the ENTER
key while cycling AC power to the attached controller. When the power-up
message appears release the ENTER key.
Sensor in wrong position. The Digital Line Guide must be mounted 1.00”
[25.4mm] above the web surface, and its sight-point scribe marks must be
aligned with the roll center-line as shown in the application drawing on page
4
137. The sensor should be positioned so that the line or edge to be guided
is ce
ntered in its field of view when the guide is in Servo-Center mode.
Sensor polarity is wrong. The value of controller parameter 3, 4, or 50
must be changed for the selected sensor. Refer to page
5
17 for more
informatio
n about setting controller parameters.
AccuBeam 3 Digital Line Guide Sensor
79
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