YSI 5X00
161
YSI 5X00
160
Follow page link below to see example to configure PID control mode:
-PID/PWM and PID 4/20mA control mode example - page 176;
Notes:
-
Changing control method between PID and Set Point may result in invalid
setp point, control and alarm value configurations. Always reconfirm sensor
setup system menu configuration when control mode is changed.
-
PID control is not available for aux digital systems.
-
DO system(s) PID set point can be configured using either mg/L or %Sat.
In contrast to the Set Point Control mode - page 153, when a system is operating
in PID/PWM or PID 4/20 mA control mode there are no user configured control
values. Instead control relays energize anytime a value is reported that is away from
the set point and the output
on time
is proportional to certain conditions and values
being reported to the 5X00.
PID/PDW and PID 4/20mA menu configurations are described in following sections.
-Interval - see page 162
-Gain - see page 162
-Reset Interval - see page 162
-Up or down control - see page 161
An example of a PID control mode system configuration is provided at page 176.
.
PID 4/20mA Control Mode
A PID (Propotional, Integral and Derivative) 4/20mA control mode system uses
an IOEM 4/20mA output device to control the system. The 4/20mA output control
device is wired (at an IOEM instrument) - see IOEM/REM Safety and Installation
Guide>chapter 3>directions to wire 4/20mA outs for wiring directions and config-
ured (using AquaManager) - see IOEM/REM Safety and Installation Guide>chapter
4>configure IOEM 4/20mA output for configuration directions.
PID Tuning
Each and every water system responds very differently to peripheral control devices
due to many factors. Factors that can influence the ability of a control device to
maintain a certain set point include size of system, peripheral equipment such as
pumps, lighting, system location and the like. While PID tuning is an important
and necessary requirement to properly configure the control system it is outside
the scope of this document to describe the tuning process. There is a wealth of
information available on the www as well as in print. Please familiarize yourself
with additional information in order to further your understanding of the PID/
PWM control method.
NEW
Configuring the 5X00
AquaManager includes a PID Tuning tool which allows simulation of various control
action values and functions. The PID tuning tool should be helpful in mimicking
your system through simulation. The AquaManager PID Tuning tool is explained in
detail in the AquaManager Help System. At AquaManager Help Contents>Working
with Nodes>PID Tuner.
Set Point
Configure the set point to be the value at which you’d like the system to ideally oper-
ate at. Configure the set point at PID mode menu. DO set point can be configured
in either mg/L or %Sat at the. Configure at PID mode menu.
Control Up/Down
Configure the PID control system to either control up (Falling, to create a control
action to reduce down the system water parameter value) or control down (Rising,
to create a control action to increase up the system water parameter value). A PID
control can be used only to control the system by either driving the system value up
or down. A PID control cannot be used to drive the system value both up and down.
PID Control Actions
Interval, Gain, Reset Interval
Configuration of three control actions allows for greater control and stablity of a
particular environment. The control actions are Gain (page - 162), Reset/Inteval
(page - 162) and Interval (page -162). These three control actions are closely
interrelated in terms of how the PID/PWM algothrium works. The objective is to
tune and configure these control actions in order that the corrective action (output
control on time
) performed by the 5X00 results in system stability. That is, the system
will hold the set point without oscillating wildly (overshooting or undershooting
by significant amounts) over and under the set point. A large amount of ocillation
could cause irreparable damage to the system by dosing too large an amount, or too
small an amount, of a control dosing additive to the system stream.
AquaManager includes a PID Tuning tool which allows simulation of various control
action values and functions. The PID tuning tool should be helpful in mimicking
your system through simulation. The AquaManager PID Tuning tool is explained
in detail in the AquaManager Help System.
Configuring the 5X00
