Ogden ETR-8300, Инструкция по эксплуатации

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5 8 Differential Control 5 8 Differential Control
In certain applications it is desirable to control a second process such that its
process value always deviates from the first process with a constant value.
Water tank 1 is 5.12 meters height and water tank 2 level is desirable to be
maintained at 1 meter lower than tank 1 level. In certain applications it is desirable to control a second process such that its
process value always deviates from the first process with a constant value.
Water tank 1 is 5.12 meters height and water tank 2 level is desirable to be
maintained at 1 meter lower than tank 1 level.
Set the following parameters in the setup menu:
FUNC= FULL
IN1, IN1L, IN1H : According to Sensor 1 signal
IN1U= PU
DP1= 2-DP
IN2, IN2L, IN2H : According to Sensor 2 signal
IN2U= PU
DP2= 2-DP
OUT1= REVR
O1TY= 4 20
PVMD= P1-2
SPMD=SP1.2 FUNC= FULL
IN1, IN1L, IN1H : According to Sensor 1 signal
IN1U= PU
DP1= 2-DP
IN2, IN2L, IN2H : According to Sensor 2 signal
IN2U= PU
DP2= 2-DP
OUT1= REVR
O1TY= 4 20
PVMD= P1-2
SPMD=SP1.2
Outlet
Outlet
From Controller Output From Controller Output
4-20 mA Valve Control Output 4-20 mA Valve Control Output
Water Tank 1 Water Tank 1
Water Tank 2 Water Tank 2
Level Sensor 1 Level Sensor 1
Level Sensor 2 Level Sensor 2
5.12 M Height 5.12 M Height
4.12 M Height 4.12 M Height
IN1 IN2
SV=1.00
PV=1.00
PV1=5.12
PV2=4.12 SV=1.00
PV=1.00
PV1=5.12
PV2=4.12
OUT1
Figure 5.13 Figure 5.13
Differential Control Example Differential Control Example
Adjust SP1( here is 1.00 ) to control the difference between PV1 and PV2. Choosing P1-2
for PVMD, the PV display will show the difference value ( PV1-PV2 ) between PV1 and
PV2, and this value will be stabilized to the set point ( here is 1.00 ).
If you need PV1 or PV2 instead of PV, you can use the Display Mode to select PV1 or PV2
to be displayed. See
. The above diagram indicates PV2 instead of PV. Section 3-23
Adjust SP1( here is 1.00 ) to control the difference between PV1 and PV2. Choosing P1-2
for PVMD, the PV display will show the difference value ( PV1-PV2 ) between PV1 and
PV2, and this value will be stabilized to the set point ( here is 1.00 ).
If you need PV1 or PV2 instead of PV, you can use the Display Mode to select PV1 or PV2
to be displayed. See
. The above diagram indicates PV2 instead of PV. Section 3-23
93
ETR-8300
Out1 Out2 Alm1 Alm2