Pumps & Conveying System Components Chapter 6: Troubleshooting 41
Test – ON – replace switch.
High-Vacuum alarm. Cont’d.
Take off compartment closed.
Conveying times are too long
(Time Fill only).
Special convey enabled.
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.
(Refer to enclosed Control
Panel Manual)
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.
Poor take-off adjustment.
Conveying times are too short
(Time Fill only). (See control
panel’s O & I.)
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.
Make sure pickup probe is
buried in material source.
Vacuum receivers are being
underfilled.
Vacuum filter is plugged.
Clean and/or replace filter.
Dump Delay time set to zero,
or insufficient dump delay
time.
Set dump delay time to the
time it takes the largest
vacuum hopper in the system
to dump.
Consult sales representative.
Filter chamber filter cartridge is
becoming obstructed too
frequently by fines and dust.
Dusty material — Optional
compressed air filter cleaning
may be needed on filter
chamber.
Consult sales representative.
No material demand at
receivers if none of the amber
lights on the optional light
board are lit.
Normal operation. Pump
packages shut off thirty (30)
seconds after no demand is
detected for the time
programmed.
Pumps and receivers are on-
line, but the pumps are not
conveying material.
(Refer to enclosed Control
Panel Manual for specific
instructions.)
The on-line receivers are not
assigned to the pumps that are
on-line.
Reconfigure the control panel,
assigning the pumps to the
desired hopper.
