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Chapter 4
REC Parameters
Parameter 1A REC Level %
The REC Level % (RECPERCENT or REC LEVEL% parameter) is a percentage of Max
Rate. It is the level of error above or below the Setpoint Rate that you can accept before
the instrument goes into REC mode. For example: If the rate calibration Max Rate is 5.0
lb/min, and the REC level % is 20%, the allowable deviation is 1.0 lb/min from the Rate
Setpoint before a Rate Exception error occurs.
Range: 0-100.0 (default 20%. This allows for a very large error. We recommend a setting
between 5% and 10% and allowing a RE+ or RE- indication about every five min.)
Parameter 1B REC Time
The time the unit must remain in the REC mode to get an alarm condition or if the
Shutdown parameter is selected to shutdown the operation.
Range: 0-999 (default 10)
Parameter 1C REC Shutdown
The REC Shutdown enables you to shutdown your operation if the system operates in
REC mode beyond the time limit set in REC Time. If you select YES for REC Shutdown
and the RE error goes beyond the REC Time, the HI 1756-FC goes to shutoff mode. If
you select NO, once the deviation goes beyond the REC Time, the system only sends an
alarm bit.
Range: NO/YES (default NO)
Parameter 1D Shutoff Percent
A shutdown signal can trigger a fixed OP % response if Shutoff Percent is greater than
0.0%. This allows for processes that should not be halted completely, even if an error
occurs, to continue at a slower rate.
Range: 0 decimal places. 0-100
Parameter 1E Total
The controller records the total amount dispensed. The Total number displays the amount
of material that has been processed from the start of the process until the process
completes or is interrupted. You would probably not want to reset the Total value each
time you start the module, but for error correction, the Total parameter can be cleared (in
either continuous or batch modes). For example, if a power failure shuts the system down
during a process, before you resume operation you can re-enter the lost total from the
front panel.
CAUTION
If you change the Total, stop the system.
Total Range 0 - >99,999.0 wt units (default 0.0)
Parameter 1F Batch Total
The Batch Total reads the total amount of material for the selected batch that has been
processed from the start of a batch process until the batch process ends (by intent or other
reason). When the Batch is complete, the Batch Total resets to 0.0 for the next batch. The
Batch Total parameter can be changed should there be an error in the batch total amount
while processing.
CAUTION
If you change the Batch Total, stop the system.
Batch Total Range 0 - >99,999.0 wt units (default 0.0)
