Chapter 7. Usage of Various Functions
7-20
2) Specification
(1)
Control operation
(a)
Proportional operation (P operation)
(a)
P action means a control action that obtain a manipulate value which is proportional to the deviation (E : the
difference between SV and PV)
(b)
The deviation (E) is obtained by multiplying a reference value to the actual difference between SV and PV. It
prevents the deviation from a sudden change or alteration caused by external disturbance. The formula of
deviation is as following;
(c) E happens, MV by P operation is like Fig.7.1
Fig 7.1 MV by P operation
(d) If the Kp is too large, the PV reaches to the SV swiftly, but it may causes a bad effect like oscillations.
(e) If the Kp is too small, oscillation will not occur. However, the PV reaches to the SV slowly and an offset may
appear between PV and SV shown in the Fig. 7.2.
(f) The manipulation value (MV) varies from 0 to 4,000. User can define the maximum value of MV (MV_MAX)
and minimum value (MV_MIN) within the range 0 ~ 4,000.
(g) When an offset remains after the system is stabilized, the PV can be reached to the SV by adding a certain
value. This value is called as bias value, and user can define the bias value
Fig. 7.2 The relation between Proportional constant (Kp) and present value (PV)
Time
:
Deviation
:
Manipulating
value
Deviation(E)
Manipulate value (MV)
Time
PV
SV
Oscillation
Offset
: Kp is too large
: Kp is too small
E
K
MV
P
×
=
Summary of Contents for GLOFA G7M-DR20U
Page 28: ...Chapter 4 Names of Parts 4 3 2 G7M DRT60U N 3 G7M DT60U N 4 G7M DT60U P...
Page 29: ...Chapter 4 Names of Parts 4 4 5 G7M DR60U DC 6 G7M DRT60U N DC 7 G7M DT60U N DC...
Page 31: ...Chapter 4 Names of Parts 4 6 3 G7M DT40U N 4 G7M DT40U P 5 G7M DR40U DC...
Page 32: ...Chapter 4 Names of Parts 4 7 6 G7M DRT40U N DC 7 G7M DT40U N DC 8 G7M DT40U P DC...
Page 33: ...Chapter 4 Names of Parts 4 8 4 1 3 30 point main unit 1 G7M DR30U 2 G7M DRT30U N 3 G7M DT30U N...
Page 34: ...Chapter 4 Names of Parts 4 9 4 G7M DT30U P 5 G7M DR30U DC 6 G7M DRT30U N DC...
Page 36: ...Chapter 4 Names of Parts 4 11 2 G7M DRT20U N 3 G7M DT20U N 4 G7M DT20U P...
Page 37: ...Chapter 4 Names of Parts 4 12 5 G7M DR20U DC 6 G7M DRT20U N DC 7 G7M DT20U N DC...
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Page 159: ...Chapter 7 Usage of Various Functions 7 52 c Program...
Page 183: ...Chapter 7 Usage of Various Functions 7 76 c Program...
Page 253: ...Chapter 8 Communication Functions 8 27 b When uses Ch 1 Built in RS 485...
Page 356: ...Appendix 1 System Definitions App1 9 6 Position Parameter...
Page 357: ...Appendix 1 System Definitions App1 10 7 High Speed Counter Parameter...