Rice Lake 720i Programmable Indicator/Controller - Installation Manual - Manual (Page 82)

76 720i Installation Manual
Level 4 submenus
VALUE number Setpoint value.
• For weight-based setpoints: Specifies the target weight value, 0–9999999.
• For time-based setpoints: Specifies, in 0.1-second intervals, a time value in the
range 0–65535.
• For COUNTER setpoints: Specifies the number of consecutive batches to be run,
0–65535.
SOURCE source_scale Specify the scale number used as the source for the setpoint.
TRIP HIGHER
LOWER
INBAND
OUTBAND Specifies whether the setpoint is satisfied when the weight is higher or lower than the
setpoint value, within a band established around the value, or outside of that band.
In a batch sequence with TRIP=HIGHER, the associated digital output is active until
the setpoint value is reached or exceeded; with TRIP=LOWER, the output is active
until the weight goes below the setpoint value.
BANDVAL 0–9999999 For setpoints with TRIP=INBAND or OUTBAND, specifies a weight equal to half the
band width. The band established around the setpoint value is VALUE ±BANDVAL.
HYSTER 0–9999999 Specifies a band around the setpoint value that must be exceeded before the
setpoint, once off, can trip on again.
PREACT OFF
ON
LEARN
FLOW Allows the digital output associated with a setpoint to shut off before the setpoint is
satisfied to allow for material in suspension.
The ON value adjusts the setpoint trip value up or down (depending on the TRIP
parameter setting) from the setpoint value using a fixed value specified on the
PREVAL parameter.
The LEARN value can be used to automatically adjust the preact value after each
batch. LEARN compares the actual weight at standstill to the target setpoint value,
then adjusts the preact PREVAL by the PREADJ value times the difference after each
batch.
FLOW preact provides dynamic compensation for material flow rate in determining
when to shut off the digital output. Rather than waiting for the specified weight to be
reached, FLOW preact uses the change in weight over time to anticipate when the
TRIP minus PREACT weight value will be reached.
PREVAL 0–9999999 Specifies the preact value for setpoints with PREACT set to ON, LEARN, or FLOW.
Depending on the TRIP setting specified for the setpoint, the setpoint trip value is
adjusted up or down by the PREVAL value.
PREADJ 0.500000
0–9999999 Preact adjustment factor. For setpoints with PREACT set to LEARN, specifies a
decimal representation of the percentage of error correction applied (0.5 = 50%, 1.0
= 100%) each time a PREACT adjustment is made.
PRESTAB 0
0–65535 Preact stabilization time-out. For setpoints with PREACT set to LEARN, specifies the
time, in 0.1-second intervals, to wait for standstill before adjusting the PREACT
value. Setting this parameter to a value greater than zero disables the learn process if
standstill is not achieved in the specified interval.
PCOUNT 1
0–65535 Preact learn interval. For setpoints with PREACT set to LEARN, specifies the number
of batches after which the preact value is recalculated. The default value, 1,
recalculates the preact value after every batch cycle.
TOLBAND 0
0–9999999 Tolerance band. For setpoints with TRIP set to HIGHER or LOWER, specifies a
tolerance band around the target weight. If the captured weight is not within the
specified tolerance band, the preact learn function is not applied and the batch is
paused (based on the value of the TOLCNT parameter, below) until restarted or
reset.
SETPTS Menu
Parameter Choices Description
Table 8-2. Setpoint Menu Parameters (Continued)