Applies to

• VLF Platesetter
• VLF Trendsetter
• Trendsetter 3244
• Platesetter 3244

Description

Causes

• Increase drum maxdiff
• Dirty encoder disk
• Dirty encoder block
• Faulty or misaligned encoder electronics
• Damaged cable
• Drum noisy
• Drum speed not constant

Solutions

Ensure proper grounding of the drum drive motor to the frame.

NOTE: See also Understanding Dependancies of Hall Sensors and Encoder.

Dirty encoder disk

Phone fix: Have operator inspect encoder disc for foreign objects or dirt. Clean the encoder disk.

Dirty encoder block

Blow off inside (laser diode) of the encoder block using a can of compressed air with a straw nozzle.

Damaged Cable

Phone fix: If it's possible to do a drum spin 60, have a technician on site move the whole card cage frame open, and then closed. See if bending the cables causes the error.

Site visit: Check the encoder cable and / or the 14 strand ribbon cable from J6 of the backplane to J2 of the drum drive amp. Replace if necessary.

Faulty or misaligned encoder electronics

Symptoms & Verification: May also be accompanied by other errors such as: "Velocity error -drum rotation blocked or PID gain settings wrong", "Timeout on velocity settling", "Timeout on velocity acceleration." Cleaning the encoder disk does not improve situation.

Phone fix: None

Site visit: Check the encoder. Align the encoder. Replace faulty encoder if necessary.

Drum Noisy

If the servo is noisier than usual when performing a drum spin 50, see Drum spin is noisy.

Drum speed not constant

Phone fix: If the drum speed appears to waver, the NVS PID gain settings may be wrong or corrupt. Do not change from the settings as shipped (VLF Platesetter, Platesetter 3244, Trendsetter 3244, VLF Trendsetter) without advice from Creo Engineering.

Perform a Drum torque test if it can be done safely. (i.e. the drum is balanced, plates are off, TEC magnets off, door closed.)

See also

• General VLF drum drive, encoder, and PLL troubleshooting
• Firmware error message 6030