© NOVATEC, Inc. 2013 All Rights Reserved
VL-VLP IM 4-12-2013
8
6- OPERATION OVERVIEW
Pressing the OFF/ON switch will start the vacuum motor, creating vacuum suction through the
conveying line, to the pick-
up wand and the loader will load material into the loader’s vacuum
chamber for an adjustable length of time.
When the load time is completed, the vacuum motor will stop, allowing material in the vacuum
chamber to relax and flow through the dump valve to the hopper or machine below.
Simultaneously, the filter will be cleaned with pulses of compressed air blown down through the
filter media. The dump time and the number of pulses used to clean the filter are adjustable.
Load and dump/pulse cycles will continue until the drying hopper, surge bin or machine hopper
below the loader is full, at which time loaded material will either hold the dump valve flapper open
or trigger a sensor, placing the system in a holding mode. As material is consumed by the
process and flows from the hopper below the loader, the material level will fall, the flapper will
close or sensor will be uncovered, and the loader will begin to load automatically again, to keep
the hopper full.
NOTE: Once the vacuum motor starts, a loading cycle will continue through the load, dump, and
pulse cycles, even if the dump flapper is held open. The loader control senses a full condition
only after the completion of the dump/pulse cycle.
7- NO-LOAD ALARM FEATURE
The No-Load alarm feature monitors the dump flapper on hopper mounted units, to assure it
opens as it should by material discharging after loading. If the flapper does not open 3 seconds
after the dump sequence has started, the no load alarm on the side of the control will sound. On
machine mounted units, the No-Load alarm monitors the photo-eye demand sensor on the glass
base to determine if loaded material interrupts the sensor path.
The alarm horn can be silenced with the silence pushbutton on the side of the control.
