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Gravimetric Batch Blenders w/Mitsubishi Control Chapter 4: Operation 63
The open weigh hopper dump door will allow the material to drop into the mixer section of
the blender. If the dump delay is set, the mixer will start before the weigh hopper dump will
open for the selected time.
The blender will sit at rest until the high-level sensor in the mixing chamber is uncovered to
start another weigh cycle. (Unless the Re-Mix timer is set to a value other than 0 and times
out to restart the mixer to run for another mix cycle.)
The level sensor is located on the back wall of the mixer chamber. If the sensor is covered
with material, the indicator light on the back of the sensor will be lit.
Once this sensor is uncovered, the indicator lamp on the back of the level sensor will go out.
This level sensor must be uncovered for approximately 1 - 2 seconds to indicate to the
controller that there is room in the mixing section to accept a batch of material.
When the controller has determined that the mixer is ready for an additional batch of
material, the controller will begin metering material into the weigh hopper assembly.
Color Changes
The color change procedure is meant for use with the basic Slide Gate/Auger Blender. This
procedure assumes that the color component of the blend is in an additive ingredient hopper
(#2, #4, #5, or #6).
Note: The blender must be stopped to make color changes. The processing machine
can operate on virgin material only during this procedure with an optional
quick color change bypass tube that can be installed to bypass the blender.
Contact the factory for details.
1. Disable and clean any color loading equipment. Please refer to the loading equipment
manual for any clean up recommendations.
2. Using the blender “Abort” or “Push to Start or Stop” key, put the blender in stop
mode. After the cycle has completed, switch “OFF” the main power switch and
unplug the blender power supply.
3. Open the upper mixer access door. This shuts off air to the blender circuit by
deactivating the master air valve. Then unplug the quick disconnect from the air
supply hose to the blender to further ensure that no air pressure is supplied to the
blender.
WARNING!
Always unplug the main power cord.
WARNING! Always disconnect the air supply to the blender.
WARNING! ...prior to performing any operations inside any access areas of the blender where
there are moving parts.
4. Remove the weigh hopper by unplugging the air line disconnect fitting, holding the
dump valve closed, lifting the hopper to clear the load cell brackets, and gently
pulling the weigh hopper out of the blender.
Note: To reduce the chance for damage to delicate load cells, use care when lifting
the weigh hopper off load cell locating tabs and when reinstalling the weigh
hopper on load cell brackets.