6. Function blocks
6.1 Manufacturer function blocks
6.1.4.4 TC - Three step controller
General
TC three-step controllers feature three states for the manipulated
variable. These states are implemented with two function block out-
puts Q1, Q2, of which either none or only one can be closed. I1 is the
setpoint and I2 is the actual value. X = I1 - I2 yields control deviation
X, which is applied on the actual controller. The controller will then
determine the manipulated variable for function block outputs Q1, Q2.
Figure 157: Three-step controller schematic diagram
I1: Setpoint
I2: Actual value
Operating principle
The following timing diagram shows how the three-step controller behaves.
Figure 158: Timing diagram for three-step controller
XH/ -XH: Distance X from switching point
H1: Hysteresis 1 for XH
H2: Hysteresis 2 for -XH
Y(t): Operating points for Q1/ Q2
Q1: Switch output X = positive
Q2: Switch output X = negative
easyE4
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Summary of Contents for easyE4 series
Page 1: ...Manual 11 18 MN050009 EN easyE4 Manual...
Page 4: ......
Page 16: ...12 easyE4 11 18 MN050009 EN www eaton com...
Page 22: ...0 1 About this manual 18 easyE4 11 18 MN050009 EN www eaton com...
Page 169: ...easyE4 11 18 MN050009 EN www eaton com 165...
Page 490: ...7 System settings 7 16 Time and Date setting 486 easyE4 11 18 MN050009 EN www eaton com...
Page 520: ...9 easyE4 inside 9 7 NET network 516 easyE4 11 18 MN050009 EN www eaton com...
Page 570: ...11 Connection to other devices 11 6 E mail function 566 easyE4 11 18 MN050009 EN www eaton com...
Page 578: ...12 Faults 12 4 Functionality of the NET faulty 574 easyE4 11 18 MN050009 EN www eaton com...
Page 582: ...13 Maintenance 13 3 Storage transport and disposal 578 easyE4 11 18 MN050009 EN www eaton com...
Page 594: ...590 easyE4 11 18 MN050009 EN www eaton com...