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Conveying System Mechanical Components Chapter 6: Troubleshooting 95 of 138
Problem Possible Cause Possible Remedy
The bin below the vacuum
receiver is full if the amber
receiver indicator light is off.
Normal operation. When
hopper level drops, material
begins conveying to it.
The receiver is off line. Put it on line via menus.
Static convey time was set to
zero.
Put in a reasonable convey
time via menus.
Field installed station by-
pass switch is simulating a
bin-full condition.
Normal operation. Throw
field-installed switch to put
hopper back in the loading
sequence.
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;
see Page 76.
A vacuum receiver bypasses
in the Loading cycle.
(Refer to enclosed Control
Panel Manual)
The Receiver-Full proximity
sensor has failed closed
(Volume Fill systems only).
Replace.
Improper pump rotation.
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 empty. Refill the supply.
Material supply bridging. Agitate material supply.
Pick up device not in supply.
Re-insert the probe.
Flapper stuck in open
position.
Clear flapper of obstructions.
Power to vacuum pump off. Inspect power.
Bad level sensor. Replace level sensor.
Plugged material line. Find and remove obstruction.
Vacuum line leak. Find and repair leak.
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.