Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 87 / 268

MFC
Functions
4.
87
4.5.4 Setpoint Trim
This controller type consists of a compound-loop-control with
adaptive setpoint. A second measurement controls possible
controldeviations, which, for example, arise as a result of attrition
in the delay tank. The compound-loop-control's adaptive setpoint
adjustment automatically equalises control deviations developing
in the system.
Input signals:
• Flow measurement (0/4–20mA, 0–10V) scalable
• Measured variable 1 compound-loop-control
(Sensor module 1 - Cl
2
, pH, mA, – )
• Measured variable 2 control measurement
(Sensor module 2 - Cl
2
, pH, mA, – )
The following requirements must be met:
Measured variables 1 and 2 must be equal measurements with the
same unit. The format (e.g. 00.00, 0000, 000.0) must be identical
as well.
The measuring range may differ (e.g. mod. 1 = 10.00 mg/l, mod. 2
= 5.00 mg/l).
When using different sensor measuring modules (e.g. Cl
2
= Mod1,
mA/V = Mod2), the measuring ranges must be adjusted
accordingly.
m g / l
6 , 8 5 7 0 5
0 , 0 0
1 . 0 0
0 . 4 3
4 . 0 0
9 . 0 0
7 . 0 0
4 0 0
p H m V
9 0 0
0 , 6 5
1 2 : 3 5 K r e i s 1
1 0 0 % 2 8 ° C
M O D E C A L M E N U
m A ?
D I
I D I I I D I I I I
E S C
F l o w s e n s o r
c o n t r o l o u t p u t
D o s i n g d e v i c e
p o s i t i o n e r , p u m p s
S e n s o r s
+ T e m p .
F l o w
s e n s o r
Q
C o n t a c t T a n k
S e n s o r s
+ T e m p .
F l o w
s e n s o r