Hach-Lange RTC103 N-Module - Manual (Page 16)

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 NH
4
, 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