81
Operating and functions
10.6.5 Doing a dosing in dosing mode "EXT. [T]"
In this mode, the dosing starts as soon as the digital input DI1 is switched.
The dosing mode "EXT. [T]" allows for starting the dosing of a quantity proportional to the duration the digital
input DI1 is activated.
Danger
Danger due to electrical voltage.
▶ Disconnect the electrical power for all the conductors and isolate it before carrying out work on the system.
▶ Observe all applicable accident protection and safety regulations for electrical equipment.
→ Connect the valves to the DO2 and DO3 outputs: see chap. 8.14.
→ Wire the output DO4 and the digital inputs DI as described in Fig. 44, chap. 10.6.3, and depending on the
following requirements:
• the transistor output DO4 allows for transmitting the dosing state.
• the digital input DI1 allows for starting a dosing whose dosing quantity is proportional to the activation duration
of DI1.
• the digital input DI4 allows for interrupting or continuing a dosing. It also allows for confirming an alarm, if the
generation of alarms has been activated on the device (see chap. 10.7.16 and 10.7.17).
• when a dosing has been interrupted, the digital inputs DI2 and/or DI3 allow for the navigation within the pause
menu, between the function "CONTINUE" and the function "RESET".
→ Restart the device:
• If the DI4 input is at the low level (not powered) when energizing the device, the four digital inputs will be active
at high level.
• If the DI4 input is at the high level (not powered) when energizing the device, the four digital inputs will be
active at low level.
→ Configure the device with this dosing mode: see chap. 10.7.11.
→ Do a dosing as shown in Fig. 50.
• If the generation of alarms (alarm "DURING") for problems occurring during a dosing has been activated
(see chap. 10.7.16), an alarm is generated if there is no flow rate measured in the pipe whereas the
valves are open. See chap. 11.3.4 to solve the problem.
• If the generation of alarms (alarm "AFTER") for problems occurring at the end of the dosing has been
activated (see chap. 10.7.17), an alarm is generated if there is still flow in the pipe whereas the valves
are closed. See chap. 11.3.4 to solve the problem.
English
Type 8025 - 8035 - SE35 BATCH
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