2.13.1.4
Controller Accuracy
Controller shall have an accuracy of plus or minus 0.30 percent of input
span, plus or minus one digit.
2.13.1.5
Controller Self Tuning
Controller self-tuning operation shall apply proportional, integral, and
derivative modes of control; mode constants shall be modified as required.
Self tuning shall only operate when selected from the front panel.
2.13.1.6
Controller Manual Tuning
Controller manual tuning operation shall provide proportional, integral,
and derivative control modes, or any combination thereof, by means of
individual mode constant adjustments. Adjustments shall be set for the
appropriate value if a particular control mode action is desired, or to
zero for the particular mode not desired. The proportional mode constant
shall be adjustable from 0 to 200 percent of input signal range; the
integral mode constant shall be adjustable from 0 to 20 repetitions per
minute; and the derivative mode constant shall be adjustable from 0 to 5
minutes.
2.13.2
Pneumatic Controllers
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NOTE: Indicate on drawings in sequence of
operation, the following controller characteristics:
1. Type of setpoint adjustment: local or remote.
Specify "field selectable" where future provisions
for remote setpoint may be foreseen, or where
similar units, a portion of which requires remote
adjustment, are to be used at remote job sites.
2.
Type of input ports:
single or dual.
3. Type of inputs: primary with single input
ports, or primary and secondary with dual input
ports.
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Controllers shall be two-pipe devices which use main air supplied to
controller and pneumatic relay to produce the controller output signal.
Controllers shall have field selectable local and remote adjustable
setpoints, and an adjustable proportional band for analog (proportional)
control or an adjustable differential for binary (two-position or floating)
control. Controllers shall have single- or dual-input ports as required
for the application and field selectable direct or reverse action for
inputs. Dual input controllers shall have adjustable secondary input
authority. Controllers shall have integral gage or test connections for
testing or indication of input and output signals.
2.13.3
Analog Electronic Controllers
Controllers shall be solid-state electronic devices which sense the
difference between input sensor analog values (resistance or voltage) and
setpoint adjustment analog values (resistance or voltage), and shall
amplify the difference signal to provide the output signal. Controllers
SECTION 15901N
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