Dover Markem-Imaje 5200, Service Manual

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SECTION 4 Diagnostic Tools
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4–21
2.7 VPC 1-2 and 3-4
The VPC 1-2 and VPC 3-4 menus are used to test the functioning of
the respective VPC. VPC 1-2 supports Printheads 1 and 2; VPC 3-4
supports Printheads 3 and 4.
2.7.1 High Vacuum Pump
Parameter Options: On, Off
Access Level: Read–3; Write–3
The High Vac Pump parameter regulates vacuum to the printhead to
remove air from the ink. This is a 24 VDC diaphragm pump and has
a check valve attached just downstream to ensure the proper level.
2.7.2 Hi Vac Sensor
Parameter Options: In. Hg.
Access Level: Read–3
This value indicates the high vacuum level reaching the printhead,
and should be above 16.5 In. Hg.
NOTE: On early model VPCs, the parameter options are “Present”
or “Absent.”
"Present" - High Vacuum sensor is satisfied (closed).
"Absent” - High Vacuum sensor is not satisfied (open) and the high
vacuum pump will stay on longer in an attempt to maintain the
required vacuum.
2.7.3 High Vacuum Duty Cycle
Parameter Options: 0-100% (Default is 5%)
Access Level: Read–3
The High Vac Duty Cycle parameter reports the percentage of time
the high vacuum pump is on.
The system turns on the high vacuum pump in 5-second increments
and then checks that the high vacuum switch is triggered. If the
switch is not triggered, an error appears.