700 P electronics module
Description
3.
35
Possible error messages:
Initial value not reached (display: "T = > 8h")
When adaption has started and the dosing system has closed or
the dosing pump has switched off, the measuring amplifier waits
until the actual value has dropped below the initial value (0.2 x the
measurement range value). This delay is indicated by “2: X = 20
%" being displayed and must not exceed 8 hours.
Loop dead time too long (display: "Tu = > 1h")
The value determined by the time measurement between starting
up the dosing, switching on the dosing pumps and the rise of the
actual value may only take a maximum of 1 hour. This measured
time is displayed by “6: Tu!”.
Loop rise time too long (display: "Ts = > 8h")
The time is determined by a measurement, which the control loop
requires at a 100 % dosing rate of the dosing system or the dosing
pump, to increase the actual value to 50 % of the measuring range.
This measurement is indicated with “9: Ts!” and may take a maxi-
mum of 4 hours.
Determination of the control pa-
rameters with known Tu and Ts
times
If the loop times Tu and Ts are already known or if these cannot
be determined automatically due to specific system conditions, the
loop times can be entered into the “Tu” and “Ts” menus. When Tu
or Ts are saved, the control parameters Xp and Tn are also calcu-
lated and entered in the menus.
3.4.11
Flocculation control
In the "Input/Output” menu, an output “Flocculation” can be
defined. This output is used for example to drive a dosing pump for
flocculant dosing.
"Signal default" setting
The dosing rate with which the flocculation output doses the chem-
ical is calculated automatically in % with the input parameters, dos-
ing rate of the pump, and amount of flocculant added.
"Signal default with ECO" setting
For reduced circulation a second dosing capacity (50 %) is calcu-
lated at the same time. Both dispensing rates can also be entered
directly. To activate the second dosing capacity (ECONOMIC),
assign the function "Changeover ECONOMIC" to one of the digital
inputs. An external contact (NC) with the function “Circulation low-
ered” must be connected to the corresponding DI.
Содержание WALLACE & TIERNAN 700 P
Страница 1: ...WALLACE TIERNAN ELECTRONICS MODULE 700 P Version 1 31 and later INSTRUCTION MANUAL...
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