MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company P3-07 - P3-09
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Parameter Details
Fig. 9.2.4.5 below is a block diagram depicting the external PID function.
Fig. 9.2.4.5 External PID Functional Block Diagram
When the External PID Set Point P1-07 is set to 0 (keypad), P2-05 is used to the value of the set point in percent.
External PID Feedback Gain P2-06 is used to set the feedback gain for the External PID Feedback Source P1-08.
Note: If the Set Point Source P1-07 and Feedback Source P1-08 are set to the same input an ERROR
MESSAGE will occur.
External PID P Gain P2-07 is used to set the proportion gain (01 – 10).
External PID I Time P2-08 is used to set the integral time (0 – 100 sec.). Setting I to= 0, disables the integral
function.
External PID D Time P2-09 is used to set the differential time (0 – 1 sec.). Setting D to =0, disables the differential
function.
External PID Bias P2-10 is used to set the offset (-100 to +100%).
External PID I Limit P1-09 is used to set the integral limit (1 – 100%).
External PID Filter P1-10 is used to set the filter time constant (0 – 2.5 sec.).
External PID Feedback Un-42, is used to monitor the feedback of the External PID Function.
External PID Input, External PID Output, and External PID Output 2 are monitored by Un-43, Un-44, and Un-45
respectively.
The PID Input and Output 2 can be accessed through Analog Output Terminal AO1 or AO2 by setting the
corresponding parameter Sn-33 and Sn-34 to =12 (External PID Input) or to =13 (External PID Output)
By setting one of the digital inputs Sn25-28 to =31 (External PID Invalid), the External PID function can be
disabled by activating that input. During the External PID Invalid mode, the PID feedback, Input, Output 1, and
Output 2 are equal to zero.
By setting one of the digital inputs Sn25-28 to =32 (External PID Integration Reset), the accumulated integration
error can be reset by activating that input.
The following parameters pertain to the load loss function.
P3-01
Load loss detection level (Cannot change during operation)
P3-01 Range: 000 – 200%
P3-02
Load loss detection time (Cannot change during operation)
P3-01 Range: 00.0 – 25.5 sec.
P3-03
Load loss action (Cannot change during operation)
P3-03=0: None
2: Load loss alarm
3: Load loss fault
Cont.