Applies to

• 3244 Platesetter 
• 3244 Trendsetter 

Description 

• Engine reports roller backbone on the drum when it is not 
• Engine reports roller backbone on the drum when it is, but was not expected to be. 
• The normal rest state for the engine is ready to load. In this state the TEC backbone is up with clamps locked to it and the LEC backbone is extended and mated to the leading
  edge clamps.
• The machine can be left in a state other than the rest state after a machine reset. On startup, the machine is expected to be the rest state. 
• After a reset, the drum must initialize, but can't with the roller down.

Causes and solutions 

If the roller is not on the drum (sensor caused):

Misadjusted reed switches or reed switch magnets

• If the roller cannot be sensed in the extend position, it is assumed to be on the drum. 
• Roller reed sensors, cables or connectors disconnected, loose, misadjusted or damaged. 
• Confirm stable air pressure and supply
• See Diagnosing pneumatic cylinder problems
• See Adjusting the 3244 drum roller
• See KRS Proofsetter Spectrum Specifications
• See Reed switch sensor adjustment procedure
• Sensors can be masked until service is on site. See Masking sensors and timeout values in notes below. 

Return the engine to the rest state:

act drlr off 
drum init 

Submitted by: Andy Timberlake
Date: December 22, 1997

Notes 

Prior to masking any sensors, increase the timeout value (set aldly roller) to a safe level above the values reported by the time engine command. Failure to do so can result in serious damage to the engine. Masking sensors should be treated as a temporary fix only and should be used only to get the customer up and running.  

The switches at each end of the backbones are wired in series such that the actuation is sensed only when both sensors switch.