Product

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

Machines affected

All machines with Firmware 0, Firmware 1 or Lotem Control Software with UDRC capability.

Component

UDRC

Error

27028 (MCE) / 43028 (MCE / Lotem Control Software): There is a problem with the nozzle pressure sensor in the output device

Symptoms

The nozzle pressure sensor is reading 0 pressure while the UDRC is on.

Causes/Solutions

Cause 1:  The vacuum tube to the nozzle sensor is disconnected, broken or hooked up to the wrong sensing port on the sensor, causing the sensor to read out of range.
Solution:  Connect the vacuum tube from the nozzle to the port marked LOW on the Setra sensor. Inspect the length of the tubing looking for breaks or kinks.

Cause 2:  The collection nozzle has accumulated debris, blocking the small pressure sensing hole.
Solution:  Clean the nozzle, following the instructions under Maintenance on the TechPlanet Debris Removal site.

Cause 3:  The main vacuum collection hose is disconnected.
Solution:  Inspect the entire length of the collection hose from the UDRC to the collection nozzle in the output device, looking for disconnections or large holes.

Cause 4:  The cabinet has lost power.
Solution:  

The green light indicates power (coming from the device cable) to the UDRC relay.

• If the green light on top of the cabinet has turned on and then off again, the power supply to the cabinet may have failed.
  Solution:
  1. Make sure the power cable is plugged in at the cabinet and the wall. Check that there is power at the wall receptacle.
  
  WARNING:  The UDRC runs off 200-240 VAC. Please use appropriate precautions when tracing main power problems.
  2. The main power connection to the motor (molex connector inside the UDRC motor enclosure) may have come loose. Turn the UDRC upside down and remove the bottom cover to gain access to the motor enclosure.
• If the green light on top of the cabinet never comes on, the bulb may be burnt out, the connections may be loose, the UDRC relay may be broken, or the cabinet may have overheated.
  Solution:
  1. Check that the green light is not burnt out. If necessary, replace the bulb.
  2. Reseat the cable connection between the device and the UDRC.
  3. Trace the cables from the green light and check the connections.
  4. Check for voltage on the line when the light should be on.
  5. Replace the relay if defective. (Some UDRC disassembly is required to access the relay in the UDRC power box.)
  6. Check that the maximum operating conditions for the cabinet are 32°C (90°F) and 240 volts. If these are met, check the cooling air inlet for obstructions. The inlet is located at the bottom front of the cabinet.
     Note:  After the motor has cooled down, the UDRC will operate. However, if the cause was not identified there is a risk of repeat occurrence of this problem.

Cause 5:  The particulate filter (or filter spacer) has been installed upside down or is not installed.
Solution:  Check that the particulate filter is placed on the spacer. Also check that the spacer is level and properly oriented.

Cause 6:  The lid is not closed.
Solution:  Check that the lid closes securely without needing to apply a lot of force.

Cause 7:  On a particulate-only system (POC), the nozzle sensing line may be hooked up to the wrong sensor on the TEE board.
Solution:  See Trendsetter 800/400 Upgrade procedure, particulate ablative media. Reset the output device to continue.

Cause 8:  The nozzle pressure sensor is wired incorrectly
Solution:  Check the continuity of the sensor wires, looking for shorts.

Technical contact(s)

Tony Lamprecht (hardware)
Ryan Hines (firmware)

Submitted by

Vince Beyer

Date submitted

25 Mar 2003