ABB AnalyzeIT AX460 User manual

AnalyzeIT
Single Input pH/Redox (ORP) Analyzer
AX460
User Guide –
PID Control Supplement
IM/AX4PID_2

ABB
The Company
We are an established world force in the design and manufacture of instrumentation for industrial
process control, flow measurement, gas and liquid analysis and environmental applications.
As a part of ABB, a world leader in process automation technology, we offer customers
application expertise, service and support worldwide.
We are committed to teamwork, high quality manufacturing, advanced technology and unrivalled
service and support.
The quality, accuracy and performance of the Company’s products result from over 100 years
experience, combined with a continuous program of innovative design and development to
incorporate the latest technology.
The UKAS Calibration Laboratory No. 0255 is just one of the ten flow calibration plants operated
by the Company and is indicative of our dedication to quality and accuracy.
Health and Safety
To ensure that our products are safe and without risk to health, the following points must be noted:
1. The relevant sections of these instructions must be read carefully before proceeding.
2. Warning labels on containers and packages must be observed.
3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with the
information given.
4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressure and/
or temperature.
5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry. Normal safe handling procedures
must be used.
6. When disposing of chemicals ensure that no two chemicals are mixed.
Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may be
obtained from the Company address on the back cover, together with servicing and spares information.
EN ISO 9001:2000
Cert. No. Q 05907
R
E
G
I
S
T
E
R
E
D
EN 29001 (ISO 9001)
Lenno, Italy – Cert. No. 9/90A
0255
Stonehouse, U.K.
Information in this manual is intended only to assist our customers in the efficient operation of our equipment. Use of this manual for
any other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval of the
Technical Publications Department.
Warning – Refer to the manual for instructions
Caution – Risk of electric shock
Protective earth (ground) terminal
Earth (ground) terminal
Direct current supply only
Alternating current supply only
Both direct and alternating current supply
The equipment is protected
through double insulation
Electrical Safety
This instrument complies with the requirements of CEI/IEC 61010-1:2001-2 "Safety requirements for electrical equipment for
measurement, control, and laboratory use". If the instrument is used in a manner NOT specified by the Company, the protection
provided by the instrument may be impaired.
Symbols
One or more of the following symbols may appear on the instrument labelling:

1
1 INTRODUCTION .......................................................... 2
1.1 Single PID Controller .......................................... 2
1.1.1 Reverse Acting (Base)
Single PID Control ................................ 2
1.1.2 Direct Acting (Acid)
Single PID Control ................................ 3
1.2 Dual (Bi-directional) PI Controller ........................ 3
1.3 Ouput Assignment ............................................. 4
2 OPERATION ................................................................. 5
2.1 Introduction ........................................................ 5
2.2 Operating Page .................................................. 7
2.2.1 Single PID Controller ............................. 7
2.2.2 Dual (Bi-directional) PI Controller .......... 8
3 OPERATOR VIEWS .................................................... 10
3.1 View Set Points ................................................ 10
4 PROGRAMMING ........................................................ 11
4.1 Setting Up Three Term (PID)
Control Parameters .......................................... 11
4.2 Manual Tuning .................................................. 11
4.3 Configure Control ............................................. 12
4.3.1 Configure Single PID Controller .......... 13
4.3.2 Configure Dual (Bi-directional)
PI Controller ........................................ 16
4.4 Configure Power Failure Recovery Mode ......... 19
CONTENTS

2
Process Variable
Control Set Point
Manual Output
PID Output Output 1
PID Control Loop
Fig. 1.1 Single PID Controller
1 INTRODUCTION
Control
Output
100%
0%
0pH 7pH 14pH
Reverse
Acting
Process Variable
1.1.1 Reverse Acting (Base) Single PID Control – Fig. 1.2
Reverse acting control is used when the process pH is less than the required output pH. Normally, a base is added to the sample to
increase the pH value.
The AX460 Single Input pH Analyzer has been enhanced with the addition of Proportional Integral Derivative (PID) control.
PID control can be either relay output (Time Proportioning or Pulse Frequency) or analog output.
The control output can be configured as either a Single PID Controller (Reverse or Direct Acting) or as a Dual PI Controller (Bi-directional
Acid/Base).
The output from the Single PID Controller is assignable to either a relay or an analog output.
The outputs from the Dual PI Controller are assignable to either relays, analog outputs or one of each type.
This supplementary manual provides additional information relevant to the PID control features of the analyzer and must be read in
conjunction with the User Guide (IM/AX4PH).
1.1 Single PID Controller – Fig. 1.1
The single PID controller is a basic feedback control system using three-term PID control with a local set point.
Fig. 1.2 Reverse Acting (Base) Single PID Control

3
Fig. 1.3 Direct Acting (Acid) Single PID Control
Control
Output
100%
0%
0pH 7pH 14pH
Direct
Acting
Process Variable
1.1.2 Direct Acting (Acid) Single PID Control – Fig. 1.3
Direct acting control is used when the process pH is greater than the required output pH. Normally, acid is added to the sample to
decrease the pH value.
Process Variable
High Set Point
Manual Output
Output 1
Output 2
PI Control Loop
Process Variable
Low Set Point
PI Control Loop
PI Output
PI Output
Fig. 1.4 Dual (Bi-directional) PI Controller
1.2 Dual (Bi-directional) PI Controller – Figs 1.4 and 1.5
The dual (bi-directional) PI controller is a a dual-feedback control system using P + I control with two local set points.
1 INTRODUCTION…

4
Reverse Acting
Base Controller
(Output 1)
Control
Output
100%
0%
0pH 6pH 8pH 14pH
Direct Acting
Acid Controller
(Output 2)
…1.2 Dual (Bi-directional) PI Controller – Figs 1.4 and 1.5
Dual (bi-directional) control is used if the pH value must be controlled within specified upper and lower limits. The minimum span
between set points is 0.5pH.
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golanA ✗✗✗✔✗
esluProemiT ✔✗✗✗✗
rellortnoCIP)lanoitcerid-iB(lauD
epyTtuptuO
)rellortnoCdicA–gnitcAtceriD(
epyTtuptuO
)rellortnoCesaB–gnitcAesreveR( 1yaleR2yaleR3yaleR1OA2OA
golanAgolanA ✗✗✗✔✔
esluProemiTgolanA ✔✗✗✗✔
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esluProemiTesluProemiT ✔✔✗✗✗
Table 1.1 Output Assignment
Fig. 1.5 Dual (Bi-directional) PI Control
…1 INTRODUCTION
1.3 Ouput Assignment
For single PID control, the output signal is assignable to either relay 1 or analog output 1. For dual (bi-directional) PI control, the output
signals are assignable to any two of the following outputs: relay 1, relay 2, analog output 1 and analog output 2 – see Table 1.1 and
Section 4.3.

5
Controller
Use the Menu Key to
scroll through the Menus
Refer to User Guide (IM/AX4PH)
Section 4.3, Page 12
CONFIG. CONTROL
CONFIG. SECURITY
OR
Use the Downscroll
Key to scroll through
the Parameters
within each Page
Use the Sidescroll Key to scroll through the Pages within each Menu
CONFIG. CLOCK Analog option board fitted
PID Controller
Control Action
Proportional Band
Integral Time
Derivative Time
Output Type
Pulses/Minute
Cycle Time
Output Range
OR
OR
Power Recovery
Power Rec. Mode
Default Output
Analog option board not fitted
SENSOR CAL.
Security Code
CONFIG. DISPLAY
CONFIG. SENSORS
CONFIG. ALARMS
CONFIG. OUTPUTS
OPERATING PAGE
Refer to User Guide (IM/AX4PH)
Fig. 2.1 Overall Programming Chart –Single PID Controller
2 OPERATION
2.1 Introduction
The location of the PID controller programming pages and menus within the analyzer's operating software is shown in the overall
programming charts – see Figs. 2.1 and 2.2.

6
Controller
Use the Menu Key to
scroll through the Menus
Refer to User Guide (IM/AX4PH)
Section 4.3, Page 12
CONFIG. CONTROL
CONFIG. SECURITY
OR
Use the Downscroll
Key to scroll through
the Parameters
within each Page
Use the Sidescroll Key to scroll through the Pages within each Menu
CONFIG. CLOCK Analog option board fitted
Acid Controller
Proportional Band
Integral Time
Output Type
Pulses/Minute
Cycle Time
Output Range
OR
OR
Power Recovery
Power Rec. Mode
Default Output
Analog option board not fitted
SENSOR CAL.
Security Code
CONFIG. DISPLAY
CONFIG. SENSORS
CONFIG. ALARMS
CONFIG. OUTPUTS
OPERATING PAGE
Refer to User Guide (IM/AX4PH)
Base Controller
Proportional Band
Integral Time
Output Type
Pulses/Minute
Cycle Time
Output Range
OR
OR
…2 OPERATION
Fig. 2.2 Overall Programming Chart –Dual (Bi-directional) PI Controller

7
2 OPERATION…
Setpoint 7.00pH
7.00
pH
24.6
Deg.C
Control Mode
pH
Manual
7.00
----
Setpoint 7.00pH
pH
% Man
7.00
60.0
Control Setpoint
pH
7.00
pH
7.00
Wash Function
Monitoring pH
Millivolts
404
mV
A: Slope & Check
100.0
%
7.00
pH
Measured Values
pH.
Temperature.
Control set point.
Control Mode
Measured pH.
Control mode.
Use the and keys to switch between manual (Manual) and automatic (Auto) control.
Control Output
Measured pH.
Control output (%), manual (Man) or automatic (Auto).
When Control Mode is set to Manual (see above), use the and keys to adjust the
control output between 0 and 100%.
Control Set Point
Measured pH.
Control set point.
Use the and keys to adjust the control set point between 0 and 14pH.
Measured Millivolts
Millivolts.
% Slope and pH Check Value
% slope value.
A value between the programmed minimum % slope value (see Set Min Slope in the
CONFIG. SENSORS page – User Guide Section 5.3) and 105% is displayed. If the value is
outside these limits, check the electrode system.
pH check value (zero point).
Displayed as an additional indication of pH electrode system condition; 7pH is the
optimum value for glass electrodes and 0pH for Antimony electrodes.
Alarm 3 set to Wash (A3: Type, User Guide Section 5.4) – see User Guide
Section 2.3.3.
Alarm 3 not set to Wash.
2.2 Operating Page
2.2.1 Single PID Controller
Note. The Single PID Controller operating page replaces the Single Input pH operating page shown in Section 2.3.1 of the User
Guide, IM/AX4PH.

8
Measured Values
pH.
Temperature.
High and low control set points.
Control Mode
Measured pH.
Control mode.
Use the and keys to switch between manual (Manual) and automatic (Auto) control.
Control Output
Measured pH.
Control output (%), manual (Man) or automatic (Auto).
When Control Mode is set to Manual (see above), use the and keys to adjust the
control output between –100 and 100%.
High Control Set Point
Measured pH.
High control set point.
Use the and keys to adjust the high control set point between 0.5 and 14pH.
Low Control Set Point
Measured pH.
Low control set point.
Use the and keys to adjust the low control set point between 0 and 13.5pH.
Note. The minimum span between low and high control set points is 0.5pH.
Continued on next page.
…2.2 Operating Page
2.2.2 Dual (Bi-directional) PI Controller
Note. The Dual (Bi-directional) PI Controller operating page replaces the Single Input pH operating page shown in Section 2.3.1
of the User Guide, IM/AX4PH.
Hi 8.00 Lo 6.00
7.00
pH
24.6
Deg.C
Control Mode
pH
Manual
7.00
----
Hi 8.00 Lo 6.00
pH
% Man
7.00
60.0
Low Setpoint
pH
7.00
pH
6.00
High Setpoint
pH
7.00
pH
8.00
Millivolts
…2 OPERATION