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7/50D Plus or 7/50D Controller Chapter 2: Functional Description 11
2-3 Standard Features
Mechanical Features
Time-fill Capability. The length of time allowed for material to drain from the station to its
receiver. During this time, the controller does not attempt to deliver any more material to the
station.
Volume-fill Capability. The length of time a station’s vacuum valve remains open to allow
material to be drawn in. The vacuum valve will close when material covers the station’s
volume-fill proximity sensor or this time elapses, whichever comes first.
Vent Valve Output. The vent valve protects the pump motor from damage during high
vacuum conditions if an undetected failure of the vacuum switch should occur. The vent
valve limits system vacuum by allowing a plunger in the valve to shift and vent the pump.
Closed-Loop Conveying. This feature allows material to be conveyed and processed
without being contaminated by outside influences (such as dust, other materials, etc.).
Common Purge Valve Output Control for Each Pump. This feature allows any remaining
material to be cleaned out of the vacuum pump or station.
Local Blowback Filter Cleaning Outputs. When this feature is enabled, the controller
periodically sends compressed air backward through the pump’s air filter to dislodge
accumulated dust and debris.
Electrical Features
• 115/1/60 or 230/1/50/60 supply voltage
• 24 VDC control voltage
• Single-point power and ground connection
• Non-fused disconnect switch, lockable
• Branch circuit fusing
• Fully accessible NEMA 4-style electrical control enclosure
Controller Features
• Allen-Bradley SLC 5/04 programmable controller with 10” color touch screen operator
interface
• Diagnostics, operating instructions and parts information are built into the interface
• Controls up to fifty (50) stations and up to seven (7) Vacuum Power Units.
• Controls up to three central alarms
• Allows operator to transfer stations to a standby pump when a pump fails
• Electronic time delay between pump startups to prevent an excessive power demand at
your facility