MC³ 24.96.EX O&M Manual Page 13 08/14/01 4:34 PM/LDD
Alarm Screen
Belt Load Over Limit
If the load on the belt exceeds the Overload Limit set in the Limit Switches on page 26, a General
Alarm of this value will occur.
Belt Load Under Limit
If the belt load ever drops below the value Underload Limit this General Alarm will be set. See Limit
Switches on page 26 for more information.
PCAD Near Zero
This error message indicates that a Raw (Gross) A/D reading less than 10 occurred. This could be
caused by the belt being lifted off of the weigh deck.
NOTE: This alarm is an indication of a serious problem. If this alarm is observed damage may have
occurred to the load cell or the suspension.
PCAD Near Full
This error message indicates that a Raw (Gross) A/D reading greater than 1,000,000 occurred.
This could be caused by too high a load on the belt.
NOTE: This alarm is an indication of a serious problem. If this alarm is observed damage may have
occurred to the load cell or the suspension.
Z Track Out Of Range
This alarm indicates that after attempting to complete a Zero Tracking calibration, the calculated
zero change was larger than the maximum specified by the operator. See Page 28 for an
explanation of Zero Tracking Parameters.
PCAD Discrepancy
If there is a discrepancy between two load cell channels (PCADs) greater that the allowed
difference this alarm will be displayed. There are several ways for this error to occur. For example,
if there is only one PCAD on the card stack but the number of PCAD’s is set to two or if the load
has shifted significantly to one side of the belt this error can occur.
Tachos Do Not Comply
This error can occur if a belt slippage condition exists. When using two tachos, the controller looks
for a specific ratio and allowed difference between the tachos. If a discrepancy occurs this alarm
will be set. If you are using only one tacho but the number of tachos is set to two this error will
occur.
Communications Lost
This error message indicates that no communications message has been received for a time
period exceeding the maximum time allowed. See the Merrick communications Specification
Manual for a complete explanation of this error.
Setpoint Out Of Range
If the feedrate setpoint is less than zero or is greater than the design feedrate this alarm will occur.
This alarm will also be enabled if the batch setpoint exceeds 10,000,000 engineering units.
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