TECO-Westinghouse PA7300 Series, Инструкция по установке и эксплуатации

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(16) Differential Time D (Bn-16)
• Output D is obtained by multiplying variation by D gain. Variation is defined as the output
obtained by multiplying the difference between the prior value of deviation and the current
value by a gain of (Bn-16 set value/7msec). No D operation occurs when Bn-16= 0.00 sec. Refer
to Figure 11a, the block diagram of PID control section. After the output D is obtained, the
current variation reading becomes the prior reading for the next reading See Appendix B.
(17) PID offset Adjustment (Bn-17)
• Constant Bn-17 adjusts the PID control offset. If both the set point value and the feedback
value are set to zero, adjust the AC drive’s output frequency to zero. See Appendix B.
Fig 11-(a) Block Diagram of PID Control Section
Fig 11-(b) Block Diagram of PID Control Section (For Versions×× and Later - Note 3))
Note 1) All PID calculations are executed every 7 msec.
2) The PID final outputs are all added.
3) See Parameter Un-10 for software version.
4) See Appendix B for detailed discussion of PID Control.
5) See page 2-70 for detailed discussion of parameter On-Ø4
(18) PID Sleep Frequency (Bn-18)
• Frequency level to activate the sleep function. When the PA output frequency drops
below the PID sleep frequency set in parameter Bn-18, the PID sleep mode timer is started.
The present output frequency (f
out
) will follow the frequency command (f
CMD
) until
f
min
is reached.
2-6
PA 7300 PART II: OPERATION MANUAL
Set point
Value
Feedback
Value
Upper Limit
Value
Primary Lag
Time Constant
Frequency
Reference
I
Upper Limit Value
Cn-43
(I)
BN-15
(D)
BN-16
offset
Bn-17
Cn-44
(P)
Bn1-14
-1
(D)
Bn-16
On-04.0
Bn-13
On-04.3
±109%
0
1
0
1
On-04.1
0
1
On-04.0
0
1
0
1
On-04.2
Bn-13
Bn-14
Bn-15
Bn-16
Bn-17
Cn-44
(P)
(I)
(D)
Upper limit Value
Limit
±109%
Offset Value
Cn-43
+
+
+
+
Primary Lag Time Constan t
Frequency
Reference
Set Point
(Multi-functional
analog input AUX
When Sn-19=09)
Feedback
(VIN or AIN)
-
+
+