Maguire Products VBD-1000, Installation Operation & Maintenance

Page: 65 / 85

Maguire Products, Inc.
Rev. March 5, 2018 – VBD-1000 Touchscreen
65
VBD

- Vacuum Dryer

THROUGHPUT
ALARM:20
Problem: The throughput of the dryer has been
exceeded.
This is an optional alarm (under alarms menu), defaulted to enabled.
This alarm is triggered when the Retention Hopper low level has been
reached before the vacuum timer has elapsed. This means demand for
material has exceeded dried material supplied. This alarm is non-fatal,
dryer continues to run.
Solution: This is cause by exceeding material demand.
LOW VACUUM
ALARM:21
Problem: Dryer failed to pull vacuum down to target
vacuum pressure set in VPL parameter.
Dryer attempted to pull a vacuum down to target vacuum pressure
within 120 seconds (default value in LVT parameter).
Possible causes and Solution: If dryer alarms, check: compressed air
connection and pressure (dryer’s regulator should be reading 85psi).
Check for debris in seals above and below Vacuum Chamber. Alarm
may also have been caused by a vacuum leak. Contact Maguire
technical support if cause is not found.
LOW BATCH
ALARM:22
Problem: Material supplied to Vacuum Chamber is
below minimum allowable weight.
This alarm is triggered by the VFA parameter (Vessel Fill Adjust) and
pertains to filling the Vacuum Chamber. The VFA parameter is a two
part parameter. The first three digits are the number of retries to fill the
Vacuum Chamber (default 3 retries). Last two digits are the minimum
allowable percent under the targeted maximum fill weight of the Vacuum
Chamber (VTH parameter). After the third failed retry the “Low Batch”
alarm is generated while the retries continue.
Solution:
Check material supply feeding the heating hopper. Check heating
hopper material flow (sticking material, melted material, hard to flow
regrind). Check Vacuum Chamber Fill Valve (butterfly valve below
heating hopper). Check air pressure (80 psi).
RESIDENCE ALARM
ALARM:23
Problem: Material has been in the retention hopper too
long.
This alarm is triggered by the RAL parameter. When the Residence
Alarm has been enabled, this alarm will sound if not enough material
has been removed from the retention hopper in the time specified in the
RAL parameter. For more information, see the RAL parameter on page
41.
Solution:
To prevent this alarm: decrease fill weight, or turn on Fill Weight Adjust
(Material Setup menu).
BATCH COMPLETE
ALARM:24
Batch is complete
This alarm triggers at the end of a batch run, the end being defined as
the time at which the retention hopper is depleted to the HHL parameter
level after the final vacuum chamber dump of said batch run.