AEC OS Series Gravimetric Batch Blenders - Manual (Page 95)

Page 94 of 118
Problem Possible solution
Blender occasionally
dumps an incorrect The blender intermittently dumps a batch of material with one or
more of the components incomplete.
batch. Check the recipe information; ensure that both the percentages
and batch size are set properly.
Check the status of the alarm flags to ensure that they are not set
wrong.
Check supply hopper ventilation.
Blender keeps dumping
after mixer is full. Check the mixer high-level switch sensitivity. When the sensor is
covered by material, the indicator lamp on the back of the switch
should be lit. To adjust the sensitivity, use the small adjustment
screwdriver that was provided with the blender. The adjustment pot
is located on the back of the sensor. Rotate clockwise to increase
the sensitivity (less material in front of the switch to actuate it).
Rotate counter clockwise to decrease the sensitivity (more material
covering the switch).
Check the mixer high-level sensor connection to the control panel.
Blender will not batch
with empty mixer. Check the mixer high-level switch sensitivity. Fines may have
coated the level switch; it needs readjustment.
Check the proximity switch connection.
Make sure that the recipe is correct.
Check batch size.
Check the air safety system to verify that a safety switch has not
tripped. Verify that the blender front indicator is green.
Mix motor does not run Check the value of the mixer timer setting.
when batch dumps. Check the value of the dump delay timer.
Check the mixer motor fuse. This is located in the control panel on
the SSR for the mixer motor. If the unit has two (2) power inlets
with a separate power inlet for the mix motor the overload fuse will
be located in the rear junction box on the blender frame.
Check the power source to the blender.
Scale is inoperable. Check the load cell in diagnostics under direct scale readout. Place
a calibration weight on the weigh hopper; determine if the weight
corresponds.
Check the load cells to make sure that a pellet has not jammed
under a load cell.
Check the load cell connections to the control panel
Check the power supply voltage and readjust as necessary as
described earlier.
Blender loses
calibration when power
is interrupted. Check the memory battery voltage on the CPU board. If the battery
is dead, the blender “forgets” settings when the power is off.
Replace it with a new battery. Order a spare CPU board; send the
replaced one back to the factory to have a new battery holder and
battery installed. If this is done in the field, the controller warranty
will be voided.