STORM
™
- SETTLING RATE MONITOR
INSTALLATION, OPERATION & MAINTENANCE MANUAL
ESTDS-STORM-IOM - REV K
Page 12 of 31
6.3
Coagulant Control Configuration Screen
The Coagulant control configuration screen is the second configuration screen and is accessed
from the Floc Control Config Screen.
Control Functions
The operator can adjust all tuning parameters of the Coagulant Pump control loop. The most
common parameters that require tuning are highlighted white. Parameters that are normally
not adjusted are ‘greyed out’.
If the
‘
ACTUAL FINAL TURBIDITY
’
(
Turbidity
) is higher than the
‘F
INAL TURBIDITY
SP’
(
SP
) then
the Coagulant Pump speed is increased. The increase is clipped to a maximum of
∆𝑆𝑝
+
.
𝐶𝑜𝑎𝑔 𝑃𝑢𝑚𝑝 𝑆𝑝𝑒𝑒𝑑 𝐼𝑛𝑐𝑟𝑒𝑎𝑠𝑒 =
(𝑇𝑢𝑟𝑏𝑖𝑑𝑖𝑡𝑦 − 𝑆𝑃). ∆𝑆𝑝
+
∆𝑁
+
If the
‘ACTUAL FINAL TURBIDITY’ (
Turbidity
) is lower than the
‘FINAL TURBIDITY SP’
(
SP
) then
the Coagulant Pump speed is slowed. The decrease is clipped to a maximum of
∆𝑆𝑝
−
.
𝐶𝑜𝑎𝑔 𝑃𝑢𝑚𝑝 𝑆𝑝𝑒𝑒𝑑 𝐷𝑒𝑐𝑟𝑒𝑎𝑠𝑒 =
(𝑆𝑃 − 𝑇𝑢𝑟𝑏𝑖𝑑𝑖𝑡𝑦). ∆𝑆𝑝
−
∆𝑁
−
If the
‘ACTUAL FINAL TURBIDITY’
is close to the
‘FINAL TURBIDITY SP’
(within a deadband), then
the same pump speed will be maintained.
To improve the response time of the Coagulant Pump control loop (on system start-up), the
coagulant pump speed will begin from
‘
INITIAL SPEED
(%)’
.
The Coagulant Pump speed is limited to operate in the band between
‘
MAX SPEED (%)
’
and
‘
MIN SPEED (%)
’
.
Navigation
There are two (2) navigation buttons at the bottom of the screen, allowing the operator to
open other screens;
•
Main (Home) screen
•
Sequence Configuration
