Product

• Platesetter 3244
• ThermoFlex
• Trendsetter 400/800
• Trendsetter Autoloader
• Trendsetter NEWS
• Trendsetter Spectrum
• Trendsetter VLF
• Trendsetter VLF Autoloader
• VLF Platesetter

Machines affected

All machines with Firmware 0 or Firmware 1.

Component

UDRC, Pressure sensor, Lionel Board - POC Start, PACC Start

Error

27024/43024:  Unable to calibrate pressure sensor. Where = nozzle, bellmouth, or differential as appropriate

Cause

1. NVS parameters may be incorrect.
2. The line may be plugged and under vacuum or the sensor may be defective.
3. The control lines to the nozzle sensor may have touched together while energized, damaging a diode on the Lionel board.

Solution

Cause 1:  NVS parameters may be incorrect.
Solution:
Verify against Debris Removal Firmware Guide-Parameter Values, Descriptions and Flowchart

Cause 2:  The zero pressure value for the sensor is not close enough to zero. The line may be plugged and under vacuum or the sensor may be defective.
Solution:

1. Disconnect the sensing line at the sensor.
2. Reset the output device.
   If the error goes away, then there is a blockage in the line that keeps the sensor under vacuum. This is most likely to happen to the nozzle sensor, since the collection nozzle could become clogged with debris over time, blocking the small pressure-sensing hole.
3. Clean the nozzle (see cleaning instructions).
4. If you are using a TH1.x nozzle that has its sensing port on the top of the nozzle, replace the nozzle with the current version (min Ver C) to avoid future problems.
5. If the error does not go away, replace the sensor.


Note:  The bellmouth sensor is the 0-100" scale Setra brand sensor. The differential sensor is the 0-10" scale.

Cause 3:  On systems equipped with a Setra nozzle sensor, the control lines to the nozzle sensor may have touched together while energized. This will damage a diode on the Lionel board, causing the sensor to display half its value. This value will be greater than +-5% from the anticipated 0 value and will not permit calibration.
Solution:

1. Start the system.
2. Type debris debug to list the offset values (this command may not be available in Lotem Control Software).
   The offset for the nozzle Setra sensor should be about 180.
3. If the value is about 90:
   • Unplug the UDRC and remove the chemical upgrade enclosure.
   • Measure the resistance between the negative lead of the pressure sensor and the ground socket on the Lionel board.
     The value should be 220 OHMS.
   • If the value is not 220 OHMS, replace the Lionel board or remove the following diodes from the board: D37, D46, D41.

Technical contact(s)

Andrew So

Submitted by

Ryan Hines

Date submitted

30 Sep 2003