HACH LANGE RTC103 N-Module User manual

DOC023.52.90448
RTC103 N-Module
Real-Time Control System for Ammonium Removal
User manual
07/2013, Edition 1A
© HACH-LANGE GmbH 2013. All rights reserved. Printed in Germany.

3
Table of Contents
Section 1 Technical data ........................................................................................................................ 7
Section 2 General Information............................................................................................................... 9
2.1 Safety information............................................................................................................................... 9
2.1.1 Use of hazard information.......................................................................................................... 9
2.1.2 Precautionary labels .................................................................................................................. 9
2.2 Areas of application .......................................................................................................................... 10
2.3 Scope of delivery .............................................................................................................................. 10
2.4 Instrument overview.......................................................................................................................... 11
2.5 Theory of operation........................................................................................................................... 12
2.5.1 Theory of operation of the RTC103 N-Module......................................................................... 12
Section 3 Installation ............................................................................................................................ 15
3.1 Installation of the RTC Module ......................................................................................................... 15
3.1.1 Power supply to the RTC module ............................................................................................15
3.2 Connection of process measuring instruments (for NH4-N, TSS and O2) ........................................ 15
3.2.1 Power supply of the sc sensors and the sc1000 controller...................................................... 15
3.3 Connecting the sc 1000 controller .................................................................................................... 16
3.4 Connection to the automation unit on the plant side.........................................................................16
Section 4 Parameterization and operation ......................................................................................... 21
4.1 Operating the sc controller................................................................................................................ 21
4.2 System setup .................................................................................................................................... 21
4.3 Menu structure.................................................................................................................................. 21
4.3.1 SENSOR STATUS................................................................................................................... 21
4.3.2 SYSTEM SETUP ..................................................................................................................... 21
4.4 1-Channel RTC103 N-Module parameterization on sc1000 controller ............................................. 21
4.4.1 1-Channel RTC103 N-Module .................................................................................................22
4.4.2 1-Channel RTC103 N-Module Stages ..................................................................................... 26
4.4.3 1-Channel RTC103 N-Module VFD ......................................................................................... 29
4.5 2-channel RTC103 N-Module parameterization on the sc1000 controller........................................ 32
4.5.1 2-Channel RTC103 N-Module .................................................................................................33
4.5.2 2-Channel RTC103 N-Module Stages ..................................................................................... 37
4.5.3 2-Channel RTC103 N-Module VFD ......................................................................................... 40
4.6 Select sensors .................................................................................................................................. 45
4.7 Control programs .............................................................................................................................. 47
4.8 Automatic program change............................................................................................................... 47

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Table of Contents
4.9 Explanations of nitrification controller parameters.............................................................................47
4.9.1 SRT MODE ..............................................................................................................................47
4.9.2 SRT (MANUALLY) ...................................................................................................................48
4.9.3 DAILY SURPLUS MASS..........................................................................................................48
4.9.4 COD-TKN RATIO .....................................................................................................................48
4.9.5 MIN NITRIFERS CONC. ..........................................................................................................48
4.9.6 MAX NITRIFERS CONC. .........................................................................................................48
4.9.7 MODEL CORRECTION FACT. ................................................................................................48
4.9.8 SUBSTIT. DO FOR MODEL ....................................................................................................48
4.9.9 NH4-N SETPOINT ...................................................................................................................48
4.9.10 P FAKT NH4 (only if NH4-N measurement in effluent is available for feed back control)......48
4.9.11 INTEGRAL TIME NH4 (only if NH4-N measurement in effluent is available for feed back
control).........................................................................................................................................49
4.9.12 DERIVATIVE TIME NH4 (only if NH4-N measurement in effluent is available for feed back
control).........................................................................................................................................49
4.9.13 Min DO ...................................................................................................................................49
4.9.14 Max DO ..................................................................................................................................49
4.9.15 SMOOTHING .........................................................................................................................49
4.10 Explanations of DO CONTROL (For DO control option only) .........................................................49
4.10.1 P FAKT O2 (For VFD option only)..........................................................................................49
4.10.2 DERIVATIVE TIME ................................................................................................................49
4.10.3 INT PART ...............................................................................................................................49
4.10.4 DAMPING...............................................................................................................................49
4.10.5 SUBST AERATION ................................................................................................................50
4.10.6 NUMBER OF STAGES ..........................................................................................................50
4.10.7 VFD P MIN (For DO control without VFD option this is fixed to 100%)..................................50
4.11 INPUTS ...........................................................................................................................................50
4.11.1 MIN INFLOW..........................................................................................................................50
4.11.2 MAX INFLOW.........................................................................................................................50
4.11.3 0/4 to 20mA ............................................................................................................................50
4.11.4 MIN RECIRCULATION ..........................................................................................................50
4.11.5 MAX RECIRCULATION .........................................................................................................50
4.11.6 0/4 to 20mA ............................................................................................................................50
4.11.7 Q RECI RATIO.......................................................................................................................50
4.11.8 MIN RETURN SLUDGE .........................................................................................................51
4.11.9 MAX RETURN SLUDGE........................................................................................................51
4.11.10 0/4 to 20mA..........................................................................................................................51
4.11.11 Q RETURN RATIO...............................................................................................................51
4.12 OUTPUTS .......................................................................................................................................51
4.12.1 MIN DO SETTING (only for option without DO control) .........................................................51
4.12.2 MAX DO SETTING (only for option without DO control)........................................................51
4.12.3 0/4 to 20mA ............................................................................................................................51

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Table of Contents
4.13 Volume............................................................................................................................................ 51
4.13.1 Aerated volume...................................................................................................................... 51
4.14 MODBUS ........................................................................................................................................ 51
4.14.1 ADDRESS.............................................................................................................................. 51
4.14.2 DATAORDER ........................................................................................................................ 51
4.15 Displayed measurement values and variables ............................................................................... 52
Section 5 Maintenance ......................................................................................................................... 53
5.1 Maintenance schedule...................................................................................................................... 53
Section 6 Troubleshooting................................................................................................................... 55
6.1 Error messages ................................................................................................................................ 55
6.2 Warnings........................................................................................................................................... 55
6.3 Wear parts ........................................................................................................................................ 55
Section 7 Replacement parts and accessories.................................................................................. 57
7.1 Replacement Parts ........................................................................................................................... 57
Section 8 Contact information ............................................................................................................ 59
Section 9 Warranty and liability........................................................................................................... 61
Appendix A MODBUS address setting ............................................................................................... 63
Index ...................................................................................................................................................... 65

6
Table of Contents

7
Section 1 Technical data
These are subject to change without notice.
Embedded PC (compact industrial PC)
Processor Pentium®1, MMX compatible, 500 MHz clock rate
Flash memory 2 GB compact flash card
Internal working memory 256 MB DDR-RAM (not expandable)
Interfaces 1× RJ 45 (Ethernet), 10/100 Mbit/s
Diagnostic LED 1× power, 1× LAN speed, 1× LAN activity, TC status, 
1× flash access
Expansion slot 1× CompactFlash type II slot with ejector mechanism
Clock Internal, battery-buffered clock for time and date (battery can be
replaced)
Operating system Microsoft Windows®2 CE or Microsoft Windows Embedded Standard
Control software TwinCAT PLC Runtime or TwinCAT NC PTP Runtime
System bus 16 bit ISA (PC/104 standard)
Power supply Via system bus (through power supply module CX1100-0002)
Max. power loss 6 W (including the system interfaces CX1010-N0xx)
Equipment properties
Dimensions (L × W × H) 350 mm × 120 mm × 96 mm
(13.78 in. × 4.72 in. × 3.78 in.)
Weight Approximately 0.9 kg (1.98 lb)
Analog input 0/4 to 20 mA for flow rate measurement
Internal resistance 80 ohm + diode voltage 0.7 V
Signal current 0 to 20 mA
Common mode voltage (UCM)35 V max.
Measurement error (for entire measurement
range) < ± 0.3 % (from measurement range end value)
Electrical surge resistance 35 V DC
Electrical isolation 500 Veff (K-bus/signal voltage)
Digital outputs Aeration and alarm activation
Number of outputs 2 (KL2032), 4 (KL2134), 8 (KL2408), 16 (KL2809)
Nominal load voltage 24 V DC (–15 % / +20 %)
Load type ohmic, inductive lamp load
Max. output current 0.5 A (short-circuit proof) per channel
Reverse polarity protection Yes
Electrical isolation 500 Veff (K-bus/field voltage)




8
Technical data
Analog output Outputs for DO setpoint or VFD control
Number of outputs One-channel: 1 (KL4011); 1 (KL4012) VFD control 
Two-channel: 1 (KL4012); 2 (KL4012) VFD control
Supply voltage 24 V DC via the power contacts
(Alternatively, 15 V DC with bus termination KL9515)
Signal current 0/4 to 20 mA
Working resistance < 500 Ohm
Measurement error
± 0.5 LSB linearity error
± 0.5 LSB offset error
± 0.5 % (relative to the measuring range end value)
Resolution 12 bit
Conversion time Approximately 1.5 ms
Electrical isolation 500 Veff (K-bus/field voltage)
Environmental conditions
Working temperature 0 to 50 °C (32 to 122 °F)
Storage temperature –25 to +85 °C (–13 to 185 °F)
Relative humidity 95 %, non-condensing
Miscellaneous
Pollution degree
Protection class
Installation category
Maximum altitude
3
III
I
2000 m (6.562 ft.)
Degree of protection IP20
Installation DIN rail EN 50022 35 × 15
1 Pentium is a registered trademark of the Intel Corporation.
2 Microsoft Windows is a brand name for operating systems of the Microsoft Corporation.

9
Section 2 General Information
2.1 Safety information
Please read this entire manual before unpacking, setting up, or operating this equipment.
Pay attention to all danger and caution statements. Failure to do so could result in serious
injury to the operator or damage to the equipment.
To prevent damage to or impairment of the device's protection equipment, the device may
only be used or installed as described in this manual.
2.1.1 Use of hazard information
Note: Information that supplements points in the main text.
2.1.2 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed.
DANGER
Indicates a potentially or imminently hazardous situation that, if not avoided, can result in death or
serious injury.
WARNING
Indicates a potentially or imminently dangerous situation that, if it is not avoided, can lead to
death or to serious injuries.
CAUTION
Indicates a possible dangerous situation that can have minor or moderate injuries as the result.
NOTICE
Indicates a situation that, if it is not avoided, can lead to damage to the device. Information that
requires special emphasis.
This symbol is a warning triangle. Follow all safety notes that follow this symbol to prevent possible injuries. If
this symbol is located on the device, it refers to information in the operating- and/or safety notes of the user
manual.
This symbol can be attached to a housing or a barrier in the product and shows that electric shock risk and/or
the risk of a death through electric shock exists.
Electrical equipment marked with this symbol may not be disposed of in European domestic or public disposal
systems after 12 August 2005. In conformity with European local and national regulations, European electrical
equipment users must now return old or end-of life equipment to the manufacturer for disposal at no charge to
the user.
Note: You obtain instructions on the correct disposal of all (marked and not marked) electrical products that
were supplied or manufactured by Hach-Lange at your relevant Hach-Lange sales office.
CAUTION
The manufacturer is not responsible for any damages due to misapplication or misuse of this
product including, without limitation, direct, incidental and consequential damages, and disclaims
such damages to the full extent permitted under applicable law. The user is solely responsible to
identify critical application risks and install appropriate mechanisms to protect processes during a
possible equipment malfunction.

10
General Information
2.2 Areas of application
The RTC103 N-Module is an universally applicable control unit which optimizes
nitrification processes in wastewater treatment plants. In addition, the RTC103 N-Module
can optionally be equipped with a closed-loop controller for setting the dissolved oxygen
concentration (O2) in the activated sludge tank. The single-channel version of the RTC
module controls one activated sludge tank. The two-channel version controls two
activated sludge tanks simultaneously.
2.3 Scope of delivery
Each RTC103 N-Module is supplied with:
•A SUB-D connector (9 pin)
•Ferrite core, foldable
•User manual
Check that the order is complete. All listed components must be present. If anything is
missing or damaged, contact the manufacturer or distributor immediately.
NOTICE
The use of an RTC module (Real-Time Controller) does not release the operator from the
responsibility of maintaining the system.
In particular, the operator must make sure that instruments connected to the RTC
open/closed-loop controller are always fully functional.
To make sure these instruments supply correct, reliable measurement values, regular
maintenance work (for example, cleaning of the sensors and laboratory comparative
measurements) is essential! (Refer to the user manual for the relevant instrument.)
NOTICE
The combination of pre-assembled components supplied by the manufacturer does not represent
a standalone functional unit. In accordance with EU guidelines, this combination of
pre-assembled components is not supplied with a CE mark, and there is no EU declaration of
conformity for the combination.
However, the conformity of the combination of components with the guideline can be proved
through technical measurements.

11
General Information
2.4 Instrument overview
Figure 1 Base module RTC 100-240 V version
Note: All components are pre-wired.
1L(+) 7Automatic circuit breaker (ON/OFF switch for item 10
and 11 without fuse function)
2N(–) 8sc 1000 connection: RS485 (CX1010-N041)
3Input AVC 100–240 V / Input DC 95–250 V 9Battery compartment
4PE (protective earth) 10 CPU base module, consisting of Ethernet port with
battery compartment (CX1010-N000), CPU module with
CF card (CX1010-0021) and passive aeration element.
524 V transformer (Specifications refer section 3.1.1,
page 15)
11 Power supply module, consisting of bus coupler
(CX1100-0002) and terminal module 24V.
6Output DC 24 V, 0.75 A

12
General Information
Figure 2 Design of the analog and digital input and output modules
Note: The number of LEDs indicates the number of channels.
2.5 Theory of operation
2.5.1 Theory of operation of the RTC103 N-Module
The RTC103 N-Module (Real-Time Controller for Nitrification) optimises nitrification
processes in waste water treatment plants which are continuously aerated (e.g. plug flow
nitrification tanks or pre-denitrification).
The RTC103 N-Module consists of an open-loop controller, based on NH4-N influent
concentration, flow rate, and the temperature in the aeration tank. Optionally, the Total
Suspended Solids concentration in the aeration tank (MLSS) can be taken into account.
Based on that information, a DO set-point is calculated which is required to reach the
desired NH4-N set-point at the effluent of the aeration tank. In addition to open-loop
control, there is also a closed-loop PID based on the NH4-N concentration at the end of
the nitrification zone that can be applied to improve control performance. The PID-output
values are combined with the open-loop output to calculate the required DO set point
(Figure 3).
1Analog or digital input or output module 
or bus termination module
2LED area with installed LEDs or free LED installation
spaces.
2
1

13
General Information
Figure 3 Principle operation mode of RTC103 N-Module
Basic RTC103 N-Module
For each lane the calculated DO set point is delivered either by analog output or via the
sc1000 ProfiBus communication card to the PLC. The DO control algorithm has to be
implemented on the PLC.
Option 2: RTC103 N-Module with DO aeration stages controller
The RTC103 N-Module is equipped with an additional DO controller adjusting the aeration
intensity to reach the calculated DO concentration. The DO control can have up to
6 different aeration stages per channel (e.g. in order to activate blower or activate discrete
aeration intensities). These aeration stages are activated by a min limit DO concentration
and the calculated DO set-point.
Option 3: RTC103 N-Module with analog DO controller
The RTC103 N-Module is equipped with an additional DO controller which, using
6 different aeration stages, adjusts the aeration intensity to reach the calculated DO
concentration. This option has two analog outputs per lane, to control up to two variable
speed drive blowers per lane.
All the above options for the RTC103 N-Module are available as single-channel (for
control of one lane) or dual-channel (for control of two lanes).

14
General Information

15
Section 3 Installation
3.1 Installation of the RTC Module
Only install the RTC Module on a DIN rail. The module must be attached horizontally, with
at least 30 mm (1.2 in.) space at the top and bottom to make sure that the passive aeration
element can function correctly.
When used indoors, the RTC Module must be installed in a control cabinet. 
When used outdoors, the RTC Module requires a suitable enclosure that supplies the
following technical specifications (see Section 1 Technical data, page 7).
The RTC Module is only operated via the sc1000 controller (see the user manual for the
sc1000 controller).
Note: The software version of the sc1000 controller must be V3.20 or above.
3.1.1 Power supply to the RTC module
Note: An external deactivation switch is recommended for all installations.
3.2 Connection of process measuring instruments (for NH4-N, TSS and
O2)
The measurement signals of the sc sensors for measuring NH4-N, TSS, Dissolved
Oxygen and Temperature (e.g. AMTAX sc, AN-ISE sc, AISE sc, SOLITAX sc, LDO2 sc,...)
are supplied to the RTC module via the RTC communication card (YAB117) in the sc1000.
3.2.1 Power supply of the sc sensors and the sc1000 controller
See operating instructions of the respective sc sensors and the sc1000 controller.
DANGER
Only qualified experts may perform the tasks described in this section of the manual, while
adhering to all locally valid safety regulations.
CAUTION
Always lay cables and hoses so that they are straight and do not pose a tripping hazard.
CAUTION
Before switching on the power supply, you must refer to the instructions in the relevant operating
manuals.
WARNING
Alternating current may destroy the direct current system and therefore jeopardize user safety.
Never connect an alternating current voltage to the 24 V direct current model.
Table 1 Supply voltage of the RTC Module
Voltage 24 V DC (–15 % / +20 %), max. 25 W
Recommended fuse C2
With 110–230 V option 230 V, 50–60 Hz, approximately 25 VA

16
Installation
3.3 Connecting the sc 1000 controller
The supplied SUB-D connector is attached to a two-wire, shielded data cable (signal or
bus cable). For additional information regarding the data cable connection, refer to the
enclosed assembly instructions.
3.4 Connection to the automation unit on the plant side
Depending on the variant (1-channel or 2-channel RTC103 N-Module, with or without DO
control) the RTC103 N-Module is equipped with various components that have to be
connected to the automation unit of the plant:
Output signals from RTC103 N-Module:
Input signals to RTC103 N-module:
•Flow rate, overall wastewater (Q_in, 0/4 to 20 mA)
•IRC flow rate input (Q_IRC, 0/4 to 20 mA) 
or 
IRC flow = C1 * Q_in with minimum and maximum values
•RAS flow rate (Q_RAS 0/4 to 20 mA)
or
RAS flow = C2 * Q_in with minimum and maximum values
Note: 0/4 to 20 mA input can be used either for Q_IRC or for Q_RAS. The other value has to be
calculated (C*Q_xxx with minimum and maximum values).
Input signals from sc1000 via RTC communication card to RTC103 N-module
•Common or individual NH4-N – concentration inlet aeration 
(Measuring points: 1. Inflow 2. Settled Sewage and RAS Mixing / Distribution
Chamber 3. aeration tank after IRC input)
•Common or individual NH4-N – concentrations at the end of each lane
•DO concentration for each lane
•TSS concentration aeration tank (option)
•Temperature (coming from a connected sensor DO or NH4, or via analog input card)
Main Input parameters:
•Parameters for open-loop control
•Parameters for PID control (closed-loop)
•Min/max DO concentration, max. rate of change
•Control parameters for DO control
Basic For each lane, a single DO set-point 0/4 to 20 mA or ProfiBus / ModBus via
sc1000 communication card
Option 2 For each lane, Aeration intensity (1 to 6 stages) for the aeration system
(0/24 V per stage or ProfiBus / MODBUS) via sc1000 communication card
Option 3 For each lane, 2 additional analog outputs (0/4 to 20 mA or ProfiBus /
MODBUS) via sc1000 communication card

17
Installation
1-Channel RTC103 N-Module
Module Name Terminal Signal Channel Function
2 fold digital output1KL2032 1 +24 V/0 V Input Signals ok (24V), Input signal faulty (0V)
5 +24 V/0 V RTC operating (24V), RTC failure (0V)
1 fold analog output KL4011 1 - 3 0/4 to 20 mA Output DO set point
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA Flow rate aeration lane
1 fold analog input KL3011 1 - 2 0/4 to 20 mA Flow rate internal recirculation or return sludge
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.
2-Channel RTC103 N-Module
Module Name Terminal Signal Channel Function
4 fold digital output1KL2134
1 +24 V/0 V 1 Input Signals ok (24V), Input signal faulty (0V)
5 +24 V/0 V 1 RTC operating (24V), RTC failure (0V)
4 +24 V/0 V 2 Input Signals ok (24V), Input signal faulty (0V)
8 +24 V/0 V 2 RTC operating (24V), RTC failure (0V)
2 fold analog output KL4012 1 - 3 0/4 to 20 mA 1 Output DO set point lane 1
5 - 7 0/4 to 20 mA 2 Output DO set point lane 2
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 1 Flow rate aeration lane 1
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 2 Flow rate internal recirculation or return sludge
lane 1
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 1 Flow rate aeration lane 2
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 2 Flow rate internal recirculation or return sludge
lane 2
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.
1-Channel RTC103 N-Module DO aeration stages control
Module Name Terminal Signal Channel Function
8 fold digital output1KL2408
1 +24 V/0 V Input Signals ok (24V), Input signal faulty (0V)
2 +24 V/0 V Aeration step 1 ON / OFF
3 +24 V/0 V Aeration step 2 ON / OFF
4 +24 V/0 V Aeration step 3 ON / OFF
5 +24 V/0 V Aeration step 4 ON / OFF
6 +24 V/0 V Aeration step 5 ON / OFF
7 +24 V/0 V Aeration step 6 ON / OFF
8 +24 V/0 V RTC operating (24V), RTC failure (0V)
1 fold analog output KL4011 1 - 3 0/4 to 20 mA Output DO set point
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA Flow rate aeration lane
1 fold analog input KL3011 1 - 2 0/4 to 20 mA Flow rate internal recirculation or return sludge
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.

18
Installation
2-Channel RTC103 N-Module DO aeration stages control
Module Name Terminal Signal Channel Function
16 fold digital output1KL2809
1 +24 V/0 V 1 Input Signals ok (24V), Input signal faulty (0V)
2 +24 V/0 V 1 Aeration step 1 ON / OFF
3 +24 V/0 V 1 Aeration step 2 ON / OFF
4 +24 V/0 V 1 Aeration step 3 ON / OFF
5 +24 V/0 V 1 Aeration step 4 ON / OFF
6 +24 V/0 V 1 Aeration step 5 ON / OFF
7 +24 V/0 V Aeration step 6 ON / OFF
8 +24 V/0 V RTC Channel 1 operating (24V), RTC failure (0V)
9 +24 V/0 V 2 Input Signals ok (24V), Input signal faulty (0V)
10 +24 V/0 V 2 Aeration step 1 ON / OFF
11 +24 V/0 V 2 Aeration step 2 ON / OFF
12 +24 V/0 V 2 Aeration step 3 ON / OFF
13 +24 V/0 V 2 Aeration step 4 ON / OFF
14 +24 V/0 V 2 Aeration step 5 ON / OFF
15 +24 V/0 V Aeration step 6 ON / OFF
16 +24 V/0 V RTC Channel 2 operating (24V), RTC failure (0V)
2 fold analog output KL4012 1 - 3 0/4 to 20 mA 1 Output DO set point lane 1
5 - 7 0/4 to 20 mA 2 Output DO set point lane 2
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 1 Flow rate aeration lane 1
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 2 Flow rate internal recirculation or return sludge
lane 1
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 1 Flow rate aeration lane 2
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 2 Flow rate internal recirculation or return sludge
lane 2
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.
1-Channel RTC103 N-Module connectors DO aeration stages / analog control
Module Name Terminal Signal Channel Function
8 fold digital output1KL2408
1 +24 V/0 V Input Signals ok (24V), Input signal faulty (0V)
2 +24 V/0 V Aeration step 1 ON / OFF (VFD)
3 +24 V/0 V Aeration step 2 ON / OFF (VFD)
4 +24 V/0 V Aeration step 3 ON / OFF
5 +24 V/0 V Aeration step 4 ON / OFF
6 +24 V/0 V Aeration step 5 ON / OFF
7 +24 V/0 V Aeration step 6 ON / OFF
8 +24 V/0 V RTC operating (24V), RTC failure (0V)
2 fold analog output KL4012 1 - 3 0/4 to 20 mA Output 1 VFD for DO control
5 - 7 0/4 to 20 mA Output 2 VFD for DO control
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA Flow rate aeration lane
1 fold analog input KL3011 1 - 2 0/4 to 20 mA Flow rate internal recirculation
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.

19
Installation
2-Channel RTC103 N-Module connectors DO aeration stages / analog control
Module Name Terminal Signal Channel Function
16 fold digital output1KL2809
1 +24 V/0 V 1 Input Signals ok (24V), Input signal faulty (0V)
2 +24 V/0 V 1 Aeration step 1 ON / OFF (VFD)
3 +24 V/0 V 1 Aeration step 2 ON / OFF (VFD)
4 +24 V/0 V 1 Aeration step 3 ON / OFF
5 +24 V/0 V 1 Aeration step 4 ON / OFF
6 +24 V/0 V 1 Aeration step 5 ON / OFF
7 +24 V/0 V 1 Aeration step 6 ON / OFF
8 +24 V/0 V 1 RTC Channel 1 operating (24V), RTC failure (0V)
9 +24 V/0 V 2 Input Signals ok (24V), Input signal faulty (0V)
10 +24 V/0 V 2 Aeration step 1 ON / OFF (VFD)
11 +24 V/0 V 2 Aeration step 2 ON / OFF (VFD)
12 +24 V/0 V 2 Aeration step 3 ON / OFF
13 +24 V/0 V 2 Aeration step 4 ON / OFF
14 +24 V/0 V 2 Aeration step 5 ON / OFF
15 +24 V/0 V 2 Aeration step 6 ON / OFF
16 +24 V/0 V 2 RTC Channel 2 operating (24V), RTC failure (0V)
2 fold analog output KL4012 0/4 to 20 mA 1 Output 1 VFD for DO control
0/4 to 20 mA 1 Output 2 VFD for DO control
2 fold analog output KL4012 0/4 to 20 mA 2 Output 1 VFD for DO control
0/4 to 20 mA 2 Output 2 VFD for DO control
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 1 Flow rate aeration lane
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 1 Flow rate internal recirculation
1 fold analog intput KL3011 1 - 2 0/4 to 20 mA 2 Flow rate aeration lane
1 fold analog input KL3011 1 - 2 0/4 to 20 mA 2 Flow rate internal recirculation
Bus termination KL9010 Bus termination
1 Ground Connector 3 and 7, 24 V Connector 6.

20
Installation