38
The figure below shows in principle how the TPC algorithm works. The curve depicts a process where
a certain pH value (setpoint) is required. This example is taken from conditioning of heating water from
a district heating plant, where the required pH value lies on 9.8 pH
Parameter
Description
Range
Default
Ts [s]
Start up - timer
0.0 to 999s
10.0
Limit 1
Setpoint for limit 1 *
5.0 - 99.9%
80.0
Display mode %
Display mode pH
0.1 - 14.0pH
11.2
Display mode Con
1 - 500 **
400 **
Display mode ISE
1 - 999 ***
800 ***
Limit 2
Setpoint for limit 2 *
5.0 - 99.9%
20.0
Display mode %
Display mode pH
0.1 - 14.0pH
2.8
Display mode Con
1 - 500 **
100 **
Display mode ISE
1 - 999 ***
200 ***
Tr [s] (limit 1)
Reaction time limit 1 ^
00.0 to 99.9s
10.0
Tr [s] (limit 2)
Reaction time limit 2 ^
00.0 to 99.9s
10.0
**
Values depend on display mode and range selected with P06, P07 and P08
***
Decimal point depends on selected range for conductivity
****
Decimal point depends on selected range for ISE
^
During this time period, no relay action will be undertaken when P06 is set to
Off (supervision/alarm function only) or On/Off Relay control mode
8 Additional Measurement & Function Modules
FX-300-REL Relay & Control
