Pumps & Conveying System Components Chapter 6: Troubleshooting 40
The field-installed station
bypass switch is bad or
miswired.
Repair, replace, or rewire.
Insufficient compressed air to
shift valves.
Supply 80 psi (552 kPa)
compressed air to all
compressed air- operated
valves.
The Bin-Full switch sensor
fails to close.
Standard switch is normally
open, held closed by the
magnet. Check for the
presence of the magnet and for
proper switch operation.
The Receiver-Full proximity
sensor is fouled, creating a
false reading (Volume Fill
systems only).
Wipe off the proximity sensor.
Re-adjust if needed.
A vacuum receiver bypasses in
the Loading cycle. Cont’d.
(Refer to enclosed Control
Panel Manual)
The Receiver-Full proximity
sensor has failed closed
(Volume Fill systems only).
Switch any two wires at the
incoming power.
Pressure is present at the
vacuum inlet.
Blowback solenoid failed
open.
Check filter chamber or pump.
Material supply bridging.
Pick up device not in supply.
Flapper stuck in open
position.
Clear flapper of obstructions.
Power to vaccum pump off.
Find and remove obstruction.
No-Convey alarm.
(Part of vacuum control panel.
Refer to enclosed Control
Panel Manual.)
Sequence-T valve problem
(where used).
Check for signal, sufficient
compressed air, proper wiring
and operation.
Material or vacuum line
plugged.
Find and remove the
obstruction, such as a coupling
gasket.
Filter chamber filter dirty.
Vacuum hopper filter dirty.
Bad atmospheric/sequence-T
valve.
Check for signal, sufficient
compressed air, proper wiring
and operation.
Vent valve on pump package
not operating correctly.
Check for signal, sufficient
compressed air, proper wiring
and operation.
Convey time set too long.
