Hach-Lange RTC113 ST-Module - Manual (Page 18)

18
Installation
3.4 Connection to the automation unit on the plant side
The one-channel and two-channel versions of the ST-Module are equipped with various
modules that must be connected to the plant automation system.
•
The feed flow rate must be provided to the ST-Module as a 0/4 to 20 mA signal.
• The polymer flow rate must be provided (on both versions) to the ST-Module as a
0/4 to 20 mA signal.
• The status signal of the thickened sludge pump (on/off) must be a digital input signal
(24 V/0 V).
• The polymer pump can be operated in pulse/pause mode (PWM).
• The status signals and fault indications are output as 0 V/24 V signals.
• Measurement errors are shown 5 minutes after the error occurs. In the event of a new
startup (return of power supply), the unit is set back to ON (24 V) after approximately
1 minute and 40 seconds if there are no measurement errors.
• In the event of a new startup (return of power supply), the RTC operating signal is set
back to ON (24 V) after approximately 1 minute and 25 seconds.
Table 3 Connections for the 1-channel RTC113 ST-Module
Module Name Connection Signal Function
2x digital input KL1002
1 Input + 24 V/0 V Status of thickened sludge pump (on/off)
2 Source + 24 V 24 V for relay
4x digital output 1 KL2134
1 +24 V/0 V Polymer pump on/off (24 V/0 V)
5 +24 V/0 V
Closed-loop control of the feed flow rate
active/inactive (24 V/0 V)
4 +24 V/0 V Input signals OK (24 V), input signal faulty (0 V)
8 +24 V/0 V RTC operational (24 V), RTC faulty (0 V)
2x analog output KL4012
1(+) - 3(-) 0/4 to 20 mA Output of the polymer pump flow rate
5(+) - 7(-) 0/4 to 20 mA Output of the feed flow rate
1x analog input KL3011 1(+) - 2(-) 0/4 to 20 mA Input of the feed flow rate
1x analog input KL3011 1(+) - 2(-) 0/4 to 20 mA Input of the polymer flow rate
Bus termination KL9010 Bus termination
1 Ground to connection 3 and 7 or to the supply voltage connections
Table 4 Connections for the 2-channel RTC113 ST-Module
Module Name Connection Signal Channel Function
4x digital input KL1002
1 Input + 24 V/0 V 1 Status of thickened sludge pump (on/off)
2 Source + 24 V 1 24 V for relay
5 Input + 24 V/0 V 2 Status of thickened sludge pump (on/off)
6 Source + 24 V 2 24 V for relay