Daytronic 10APID Bedienungsanleitung
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10APID
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For use in System 10 ....... The Model 10APID is a flexible means of achieving stable, high-speed closed-loop control in engine
dynamometry, fluid pumping, hydraulic servo operations, and any number of other industrial applications. It is compatible with all
System 10 mainframe models.
Operating on standard SET-POINT (“COMMAND”) and FEEDBACK (“RESPONSE”) inputs that may be analog, digital, or
mixed, the 10APID generates a fast, selectively damped ERROR SIGNAL. The COMMAND input is user-adjustable, while the
RESPONSE input represents the measured process variable to be “controlled”— temperature, pressure, position, etc. The ±7
V-DC ERROR SIGNAL output can be used to drive a motor, pump, solenoid valve, relay, temperature regulator, or other servo
equipment, in order to continuously control the measured variable, thereby keeping the process at a steady state, even under
widely varying conditions.
The fastest loop response characteristics are obtained when COMMAND and RESPONSE inputs to the 10APID are both
“real-time” analog signals. This permits continuous error-sensing feedback independent of the mainframe’s internal scan
speed—resulting in a speed that is simply not possible with most sample-based multiplexing systems. In this case, the 10APID
may receive its COMMAND and RESPONSE signals either via hardwire connection to the mainframe’s analog motherboard
(when the signal source is internal to the mainframe system) or via the card’s rear 20-pin I/O connector (when the source is
external).
The COMMAND and RESPONSE inputs may also be established digitally, as standard system data channels. This permits
them to be directly loaded by the operator or supervisory computer, or to represent continuous arithmetic functions of other
system channels that report either constant or variable data. In this case, the COMMAND and RESPONSE inputs may be
easily set and/or modified through the ANALOG OUTPUT (ANO) or CALCULATE (CLC) command. Although the overall
control-loop response time is now limited by the scan rate of the system Central Processor, this will not be a problem in most
applications, since the scan rate is typically over 2500 channels per second.
Regardless of their respective sources, the COMMAND and RESPONSE inputs are continuously available as standard ±5
V-DC analog outputs both from wirewrap pins on the mainframe motherboard and from the 10APID’s rear I/O connector. They
may thus be read by other signal-processing and/or display elements either internal or external to the mainframe system.
Derived from the arithmetic difference between the COMMAND and RESPONSE inputs, the ±7-V ERROR SIGNAL is
continuously available as an analog output from the rear I/O connector only, for connection to the process actuator. You
can easily and precisely adjust the 10APID’s PROPORTIONAL, INTEGRAL, and DERIVATIVE coefficients to tailor the
characteristics of the ERROR SIGNAL output to your specific control application. In general, you will want to make the error
signal react as fast to a change in the COMMAND and/or RESPONSE input as the actuator to which it is issued allows or
requires.
This procedure (“tuning the loop”) is again accomplished by means of the ANALOG OUTPUT (ANO) command. The millivolt
value to which the 10APID’s INTEGRAL (“I”) input is set determines the “rise time” of the error signal, thereby controlling the
basic response time of the loop. A nonzero PROPORTIONAL (“P”) gain term may then be applied to stabilize the error signal
(if it has a large “I” rate). Finally, a nonzero DERIVATIVE (“D”) input may be applied to “soften” the error signal, so that the user’s
servo equipment does not receive a step impulse, and also to slow down the RESPONSE as it approaches the COMMAND
value, thus reducing or eliminating overshoot or undershoot.
SINGLE CHANNEL “PID” LOOP CONTROL
CARD
MODEL 10APID
SINGLE CHANNEL “PID” LOOP CONTROL CARD
[“A’ CARD SERIES]
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10APID |
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