ABB ACX Commissioning Instruction page 41

Start of the Back-Purging Procedure
Start of the Back-
Purging Procedure
Start
Controlled by Time
Start
Controlled by Event
Manually Controlled
Start
CI/ACX-EN Rev. D
The start of the back-purging procedure can be carried out
•
Controlled by time
•
Controlled by event
•
Manually controlled.
After a cycle time has run down, the back-purging procedure will start automatically.
The cycle time can be adjusted individually (see section "Adjustment of Cycle Time and
Post-Purge Time", page 46). A cycle time of 4 hours is factory-set.
A flow fault during normal measuring operation will start the automatic back-purging
procedure. After back-purging was started by event, the procedure will run only once.
If the procedure is finished (waiting time 30 sec) and the starting event (flow fault) is
still active, the back-purging procedure will not start again, even not controlled by
time, and a status message "Probe or line is plugged" will be generated. However, the
back-purging procedure can be started manually.
The manual start of back-purging procedure can be executed locally by softkey "Start
Purge" on the system's display and control unit (see section "Control Panel Screen",
page 70) or remote-controlled via Modbus-DI or Profibus-DI.
ACX Analyzer System Commissioning Instruction 41