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Gravimetric Batch Blenders w/Mitsubishi Control Chapter 3: Installation 50
If the re-mix timer is disabled, the controller will run only a single, timed mix cycle after each
dump of the weigh hopper.
To view and change the value of the re-mix timer, refer to the “Mixer and Dump Setup”
menu. All current values for Mixing and Remixing Times will be shown on this screen. The
re-mix timer default value is factory preset at zero.
Weigh Hopper Dump Time
The weigh hopper dump time is the amount of time the weigh hopper’s dump valve remains
open to allow weighed material to exit the hopper and enter the mixer.
To view and change the current weigh hopper dump time settings, enter the Setup menu and
select the “Mixer and Dump Setup” screen. Press the field next to “Dump Time” to set the
operation of the Dump Valve.
The dump timer on the dump valve has a default time of eight (8) seconds. This time can be
adjusted to optimize the blender cycle time.
The timer should be set to close the dump valve shortly after the material has totally dumped
from the weigh hopper. This time can vary due to material flow characteristics, and the size
of the batch that is programmed into the blender control. Experimentation with this setting
can allow the operator to determine the best cycle for the material being weighed.
Weigh Hopper Dump Delay Time
The dump delay time is the amount of time from the end of metering the last ingredient until
the start of the actual dump cycle. The start of the dump cycle is marked by the opening of
the weigh hopper dump valve. This value has a range from 1 second to 999 seconds. To view
and change the current dump delay time, enter the Setup Menu, select “Mixer and Dump
Setup” screen, and then select “Dump Delay”.
The default time is factory set at zero seconds. This delay time is used to start the mixer prior
to dumping the material from the weigh hopper into the mix chamber of the blender.
Weigh Hopper Dump Cycle
The dump cycle allows the weigh hopper dump valve to cycle, or open and close, a number
of times prior to commencing with the next batch cycle. The setting allows from 1 to 9 dump
cycles between batches (open and closed cycles).
The normal and default factory setting is 1, meaning the weigh hopper dump valve will open
at the end of the weighed batch and close after the batch is discharged into the mixer.
Setting the dump cycle to more than one cycle may be useful when blending high static, dusty
material or those that have sticky tendencies. This will cycle the dump valve open and closed
to allow any material that may cling to the dump valve.
To enter the dump cycle menu, first enter the Setup menu by pressing the Manufacturer’s
icon from the main menu. Enter the password and press enter. Next, press the button marked
“Mixer and Dump Setup”. The display will show the “Mixer and Dump Setup” menu. Press
the “Dump Cycle” key to enter a dump cycle value and press enter. Please refer to the menu
structure tree shown on page 59.