Lotem Spectrum - Checking and Adjusting the drum vacuum analog detector

Description
Unique to the Lotem Spectrum, the proofing media is held to the drum with vacuum alone (and without grippers). The Drum Vacuum Analog Detector, also unique to Spectrum machines, measures the vacuum pressure on the drum during loading with the Carrier, with the Receiver and with the Donor. It is important to set the correct value to prevent the media from flying off during exposure.

• To access the Drum Vacuum Analog Detector parameter, select
  Utilities>Hardware>Drum System>Drum Detectors>Drum Vacuum Analog Detector.
  The Drum Vacuum Analog Detector dialog box appears:
  

Loading the Carrier
The Carrier loading sequence is similar to the plate loading sequence. When the Carrier is wrapped on the drum, the Drum Vacuum Pressure
should be in the range of ~-250 - -470.

Proofing Media - Receiver & Donor
The proofing media - Receiver and Donor - are loaded on top of the Carrier and are held by vacuum only. You must set a minimum Drum Vacuum Value prior to loading the media, and during exposure.

• Receiver - When the Receiver is loaded, the Drum Vacuum Pressure should be in the range of ~ -550 - -730.
  
• Donor - When the Donor is loaded, the Drum Vacuum Pressure should be in the range of ~ -740 - -860.
  
  Note: After loading the Donor, deactivate the Drum Vacuum Release Valve before checking the Drum Vacuum Pressure. (Hardware>Loading system>Loading plate to drum>Solenoids/Valves)