Setpoint Rate/Ramp/Soak Program Operation
5/00 UDC3300 Expanded Model: DC330E User Manual 69
Output Override Hi/Lo Select
Output Override allows you to select the higher of Output 1 and Output 2 (Hi Select)
or the lower of Output 1 and Output 2 (Lo Select) to appear at Output 1 terminals to
drive the final control element. Refer to Section 4.8 for Override rules.
Override prompts appear under the Algorithm Set Up group, function prompt OUT
OVRD.
4.11 Three Position Step Control Algorithm
The Three Position Step Control algorithm (Loop 1 only) allows the control of a valve
(or other actuator) with an electric motor driven by two controller output relays; one
to move the motor upscale, the other to move it downscale, without a feedback
slidewire linked to the motor shaft. Accutune SP or SP+PV tuning does not function
with this algorithm. Accutune TUNE will operate with this algorithm.
Displaying the Motor Position
Table 4-18 Procedure for Displaying the 3PSTEP Motor Position
Step Operation Press Action
1
Access the
displays
LOWER
DISPLAY
until you see the PV Value in the Upper Display and
either POS or OUT in the Lower Display.
4.12 Input Math Algorithms
If selected via Math options, this controller has two input algorithms available. Each
algorithm can be configured to provide a derived (calculated) PV or a derived
remote setpoint. Up to three inputs may be applied to the calculation. In addition, the
two algorithms may be “linked” to combine two calculations by configuring one
algorithm to be an input to the other algorithm.
Standard functionality:
• Basic models (DC330B) contain as standard: Weighted Average, Feedforward
Summer, Feedforward Multiplier.
• Expanded models (DC330E) provide as standard: Weighted Average,
Feedforward Summer, Feedforward Multiplier, Relative Humidity.
The Math option, which provides additional algorithms plus two Characterizers,
Totalizer, and Gain Scheduling, is available only on Expanded Model
DC330E-XX-XXX.
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