AccuWeb EVO 150, Instruction Manual

Page: 81 / 137

AccuBeam 3 Digital Line Guide Sensor 79
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
1 Bad cable connection. If the display is not working, check the interface
cable and replace if bad.
2 Keypad is disabled. Refer to page 78 for more information about this
feature.
3 Non-volatile memory contains bad data. Reset all parameters to their
default values:
To reset all parameters to their default values, press and hold the ENTER
key while cycling AC power to the attached controller. When the power-up
message appears release the ENTER key.
4 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
121. The sensor should be positioned so that the line or edge to be guided
is centered in its field of view when the guide is in Servo-Center mode.
5 Sensor polarity is wrong. The value of controller parameter 3, 4, or 50
must be changed for the selected sensor. Refer to page 21 for more
information about setting controller parameters.