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TRANSCRIPT
DECLINING WEIGHT BLENDING SYSTEM
OPERATION MANUAL
12285 E. MAIN ST.
MARSHALL, IL 62441
PHONE: 217-826-6352
FAX: 217-826-8551
WEB SITE: www.yargus.com
OPENING SCREEN
The OPENING SCREEN is just the screen that the PLC system boots up to if ever a
power cycle was to occur. From here you can navigate to any location in the system. At the
bottom of this screen and all other screens is the menu bar. Most of the operations will be
performed through the SYSTEM MENU and VAVLE MENU buttons. A description of each
button will follow later in the manual.
SYSTEM MENU button
The SYSTEM MENU button groups system related screens
DISPLAY SETTINGS
Here you can adjust the display brightness, activate a screen saver and set the system time
and date. For brightness control you would just arrow up or arrow down. The screen saver is
activated by pressing its button. The time and date can be set by pressing the SET TIME/DATE
button and follow the format shown.
BLEND ENTRY
Blend Entry begins the process of running a blend. Here you would enter the weight of
each chemical in each hopper. The name of each chemical is listed above the hopper weight
entry button. Entering actual weight per each hopper would be the method used when not
running a ratio blend. Running a ratio blend is described later in this manual. After you enter in
all desired weight for each chemical, you would then press the RUN BLEND button. Any alarms
that may occur will appear towards the bottom of the screen. For instance if weight is entered for
a hopper and that hopper does not have its VOLUME CONSTANT, BULK DENSITY, or
VALVE DELAY set, an alarm will appear. These three characteristics must be set before
running a hopper. The numeric values shown at each hopper is the valve RPM speed at which the
valve will run. As the weight changes for each valve, these values may also change. 75RPM is
the fastest and 8RPM is the slowest speed a valve can start out at.
RUN BLEND
The RUN BLEND screen can only be accessed through the Blend Entry screen when weight has
been entered in one or more valves. Here only the hopper or hoppers with blend weight will
appear. Also the run-time is also calculated and displayed. The color scheme for each valve is as
follows: green indicated the valve is in DW mode, Silver indicates volumetric mode, and orange
indicates impregnation mode. Once the run-time is displayed and the START button, the blend
will start when the operator presses the START button. After a blend is started, this same button
becomes the PAUSE button for pausing blends. Then START again to re-start. After a blend has
started a CANCEL button appears which can be used to cancel a blend completely.
RUN TAPERED BLENDER
RUN TAPERED BLENDER is the only screen for running the tapered blender. It can be
run at any time separate from the RUN BLEND mentioned above. First you press the start button
to turn on the blender. If the HOA switch on front of the PLC panel is at Auto the gate would
close at this time. If the HOA switch is in HAND you would verify the gate status is closed and
if not press the CLOSE button. Now add weight to the blender and view the weight here on the
screen or the large display. After finishing adding the weight the REQUIRED box shows how
much liquid is needed for impregnation. Press the START TAPERED BLENDER button and the
impregnation will begin and stop when it’s reached the REQUIRED amount.
SPOUT LOCATION
The SPOUT LOCATION screen can also be accessed through the RUN BLEND screen.
Here you just select which spout you want your blend to travel through. The current location of
the SPOUT is shown in the top right corner. The SP1,SP2…names can be changed to the users
liking of 14 characters or less.
LOADOUT DELAYS
The LOADOUT DELAY should be set to a high enough number so at the end of a blend
all product has left the load out section/s. This would include all conveying sections after the
under bin. The delay time is in seconds.
I/O SCREEN
The I/O SCREEN is mainly used for troubleshooting and/or maintenance. Here you can
view all input and output status.
VALVE MENU button
The VALVE MENU button groups valve related screens.
VALVE MODE
The VALVE MODE screen is used to switch a valve or valves from a DW mode
to a volumetric mode. This can be useful if a load cell ever quit working you could come
here and switch to volume metric mode and continue to use that hopper. When the load
cell got replaced or repaired you could then switch back to DW mode.
VOLUME CONSTANT
VOLUME CONSTANT screen is used to set the volume constant of each valve. In a DW
system this value can be self adjusted or calibrated at the end of each blend for more precise
weight loss accuracy.
BULK DENSITY
Each chemical for each hopper should have its BULK DENSITY measured and the
measured values recorded here.
EMPTY HOPPERS
EMPTY HOPPER screen is used for cleaning out a hopper in order to fill that hopper
with a different chemical. There is no system feedback when emptying a hopper. Once you press
the button the hopper will run until you press the button again to stop it.
SCALE READINGS
The SCALE READINGS screen will allow all hopper weight to be read if it is a DW
valve and it’s in DW mode.
VALVE DELAYS
The value entered here for each DELAY VALVE is in seconds and should be a measured
time of how long it takes for the product to get from one valve to the next valve in front of it.
This run-time can be calculated or simply entered by using a stop watch. A DELAY VALUE
cannot be equal to zero. If a zero is needed a value of .01 is sufficient. The VALVE DELAY
time reference is the end of the under bin. This is referred to as the focal point. Start out by
measuring the time the chemical of the last valve (closest to the focal point) takes to reach the
focal point. After this then measure the time the chemical of the next valve back (second to last)
takes to reach the valve just in front of it takes. The one just measured. And repeat this process
until you reach the first valve.
VALVE TEXT ENTRY
The chemical name that’s in each hopper can be entered here and is used throughout the
system. This name can be 14 characters or less and can be the same name that’s in another
hopper.