Sterlco SGBD Series Batch Gravimetric Blenders - Manual (Page 71)

BLN1-600A Chapter 4: Operation 71 of 116
Power Interruption while metering a Batch: This alarm indicates that the blender’s power
was turned off while the blender was making a batch. The batch accuracy would have been
compromised since it did not finish the batch in progress.
PLC Battery Low: PLC battery is low and may cause the blender to lose both the program
and the blender configuration. Notify Maintenance immediately.
PLC Module Loaded: This alarm occurs after a software upgrade to the PLC. The alarm
instructs you to turn off power to the blender, remove the Memory Module, turn on power,
and then reconfigure the blender parameters.
Inventory Cleared: This is only logged in the Alarm Log and does not cause a pop-up
message or audible alarm. Each time the inventory is cleared, the time and date are logged to
the Alarm Log. An alarm will sound and a screen will pop up when Auto. Inventory
Shutdown has been reached.
E-Stop Screen: The blender is equipped with an System-stop switch that removes the power
from all mechanical outputs. The System-stop Screen appears along with an audible alarm
whenever the System-stop is activated. The operator can not access any screens until
System-stop is deactivated. The Panel View will then put the screen back to the display that
the operator was on prior to hitting the System-stop. The System-stop does not provide a
category 0 or 1 stop. It is recommended that the System-stop be moved closer to the power
input so as to disconnect all power when the System-stop is pushed.
BLENDING MODE SEQUENCE
Once the operator initiates the run mode of operation, the blending system controller will
begin monitoring the mixer high-level switch. Nothing will happen until the mixer high-level
switch is uncovered. This tells the controller that the mixing chamber is capable of holding
another batch of material.
Once the mixer high-level switch is uncovered, and the weigh hopper has dumped, the system
will meter the ingredients from the supply hoppers, through the metering units, into the weigh
hopper. Each component will be metered individually to allow accurate weighing of the
material.
Each component is metered in the order specified by the “Metering Order” setup. See the
Installation & Setup chapter for further details.
Once the final ingredient specified in the recipe has been metered into the weigh hopper, the
controller will take a final weight reading of the weigh hopper. This will start the “Dump
Delay” timer. (See Page 58). Once the dump delay timer has timed out, the controller will
activate the weigh hopper dump valve, initiating the weigh hopper dump cycle.
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.
• Before starting Batch blending systems, each ingredient hopper in the
current recipe must contain material! Virgin material must be loaded in
hopper #1 and hopper #3 should only be used for regrind!!