VL-VLP IM 19 JUNE 2017 © 2017 NOVATEC, Inc. All Rights Reserved
Page 10
No-Load Alarm Horn
Alarm Horn Silencer
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.
8-
ADJUSTING the LOADER CONTROL
The VL and VLP series loaders
from NOVATEC employ a
Siemens brand, model LOGO!
Mini-PLC Control for loading functions. The control is
housed in a rugged enclosure and is factory programmed
for functions related to vacuum loading.
NOTE: The user may adjust certain parameters of the
control to fine tune their loader’s
operation, but changing settings
other than those listed can
damage control operation.
The control is equipped with a small LCD screen that displays operating and programming
prompts, plus pushbuttons to aid in selecting parameters and making changes. A No-Load
alarm horn is located on the side of the enclosure along with a silence button.
Instructions listed here are repeated on the control face for ease of use.
