AEC VacTrac Series Conveying Systems - Manual (Page 106)

Page 106 VacTrac™ Series Conveying Systems
WH2-605A.4 Mechanical Components
Problem Possible cause Solution
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.
Bad level sensor. Replace level sensor.
Plugged material line. Find and remove obstruction.
Vacuum line leak. Find and repair leak.
No-Convey alarm.
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. Clean filter.
Vacuum hopper filter dirty. Clean filter.
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.
High-Vacuum alarm.
Improper piping. Locate and correct.
Conveying times are too long
(Time Fill only).
Observe and time the hopper(s)
when loading. Note the time
needed to fill a hopper. Set the
conveying time to a few seconds
less.
Vacuum receivers are being
overfilled.
Maximum conveying times are
too long (Volume Fill only) and
the Receiver Full proximity
switch(es) are not being
recognized by the PLC.
Check proximity sensors for
proper operation and proper
wiring to PLC. Repair. Re-set
the conveying times to
reasonable times. Re-adjust if
needed; see Section 3-32 on
Page 69.
Conveying times are too short
(Time Fill only).
Observe and time the hopper(s)
when loading. Note the time
needed to fill a hopper. Set the
conveying time to a few seconds
more.
Vacuum line leak. Find and repair leak.
No material to convey.
Make sure pickup probe is
buried in material source.
Vacuum receivers are being
underfilled.
Vacuum filter is plugged. Clean and/or replace filter.