Hardy HI 1756-FC - Manual (Page 27)

ON-FIXED: With Auto Refill, you can use ON-FIXED to either lock in an effective
learned value or enter a noted value that has worked well on previous applications.
Range: 0, 1 or 2
Parameter 18 OP Adjust %/wgt during refill
Refill OP Adjust %/wgt
This is the OP (Output Percentage) Adjust % per unit of wgt. Rate calibration determines
this parameter, so you may not want to set it. It would be difficult to know what to enter.
The weight of an ingredient in a hopper can affect the rate of feed. For example, a liquid
at the base of a full hopper is under greater pressure than a liquid at the base of a near
empty hopper. If no adjustment is made, the liquid flows out faster when the hopper is
full than when it is low. When the OP Adjust parameter is ON (i.e., not set to OFF), the
OP Adjust %/wgt value will adjust the refill rate to compensate for any change in weight
of the ingredient in the hopper. OP Adjust On Learn is used to calculate this value.
Range: -100 to +100 up to six decimal places (Default 0.0)
Parameter 19 Wait Time
Time the controller waits for the material to settle before it calculates the batch total.
Seconds, 0 decimal places. Must be > or = 0
Parameter 20 Low Alarm Shut Down Rate
If the actual flow rate is below the setpoint beyond the alarm delay time, the Lo Shutoff
alarm can be configured to signal an alarm condition that can either shut the process
down or lower the output to a set percentage (See Shutoff % Out below). The decimal
point is positioned based on the Rate DP parameter.
NOTE The Lo Shutoff alarm value must be equal to or less than the lowest set point value.
Range: No limits
Parameter 21 High Alarm Shut Down Rate
If the actual flow rate is above the setpoint beyond the alarm delay time, the Hi Shutoff
alarm can be configured to signal an alarm condition that can either shut the process
down or lower the output to a set percentage (See Shutoff % Out below). The decimal
point is positioned based on the Rate DP parameter.
Range: No limits
Parameter 22 Alarm Delay
The number of seconds you want the instrument to delay before setting off either a HI
shutoff or LO shutoff alarm after detecting a flow rate that is out of tolerance. This avoids
nuisance alarms and gives the system time to clear a problem.
If a product is easily liquefied, set a very short delay to prevent large spills. If a product
tends to plug or bridge set a longer delay.
Range: 0 decimal places. Must be > or = 0.
Parameter 23 Rate Setpoint
The Rate Setpoint is the ingredient target flow rate (Loss in Weight) you want to
maintain for your process. The decimal point is positioned based on the Rate DP
parameter.
Range: Must be > or = 0, < the maximum rate set for rate calibration.
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Chapter 4 ●
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