Maguire Products, Inc.
Rev. March 5, 2018 – VBD-1000 Touchscreen
25
VBD
- Vacuum Dryer
What is happening when the dryer is running:
During the Pre-heat operation material in the heating hopper is brought up to temperature
(T1s). Preheat time is determined by the specified Preheat Time on the Pre-Start screen
(timed preheat, default 60 minutes) or by the Preheat Setup Auto option, which sets an inlet
to outlet temperature delta and a minimum preheat time.
After pre-heat, approximately one third of the material in the heating hopper is dispensed
into vacuum chamber, and the first vacuum cycle begins. Each vacuum cycle has a
minimum vacuum time, set on the Pre-start screen, or the main run screen (VTs). (default
is 20 minutes).
The loader loads the Heating Hopper with new material as the Vacuum Chamber receives
the heated material and heating cycle begins concurrent to vacuum cycle (the first vacuum
cycle is timed). The new batch of material in the upper portion of the heating hopper will
take less time to heat. Minimum time in the heating is dictated vacuum time.
After first vacuum cycle, material is then dispensed into retention hopper ready for use.
Material in the retention hopper is blanketed with dry air.
The rate of consumption of dried material from the retention hopper ultimately dictates the
amount of time that the material will be preheated and under vacuum.
Examples:
If it
takes 30 minutes to deplete the retention hopper, the vacuum cycle will run past its 20
minute setpoint (pre-start screen) to 30 minutes. This is normal operation. However if the
retention hopper is depleted in 15 minutes and the vacuum time is set to 20 minutes, there
will be a 5 minute window where no material is available. This indicates that the throughput
of the dryer has been exceeded. If the Throughput Alarm is enabled (Alarm Setup), a
Throughput Alarm (Alarm Code 20) will be triggered.
Summary of Contents for VBD-1000
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