Commissioning
Ex p Control unit
SILAS
pz
Page 74 of 88
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Rev. 0
Setting the “Purge gas valve“
Due to the fact that no purging is
performed in Ex pD (dust) applications,
the purging gas valve is replaced by an
adjustable purging gas nozzle.
To ensure that the control unit does
not activate a valve, the setting
"without" must be adopted in the
corresponding WEB-Interface menu
"Extended / Valves".
Inlet- and Outlet valve are set to
“without”.
Setting the “Ex p parameters / pressure parameter“
The pressure parameters to be observed are part of
IEC / EN 60079-2.
Furthermore, the pressure parameters are application-dependent and
must be checked during initial commissioning.
The following values can be applied as a basic setting:
po = 1.5 mbar (150 Pa)
p1 = 1.0 mbar (100 Pa); p2 = 1.2 mbar (120 Pa)
p3 = not applied for dust applications
p4 =5.0 mbar (500 Pa); P5 = 5.0 mbar (500 Pa)
Procedure
Connect PC with Ex p control unit, activate programming switch
Login to the WEB interface with the user level
Call up the Purge parameter / Pressure parameter menu
Enter and confirm the "po - operating overpressure" parameter
e.g. 250 Pa (2.5 mbar)
The value "po" is the internal operating overpressure of the pressurized
enclosure. This value is monitored by the Ex p control unit and
compensated if necessary.
Pop-up window with display changed value opens
Confirm pop-up window with changed value
Enter and confirm pressure parameter "p1 - minimum pressure
e.g. 100 Pa (1.0 mbar)
Pop-up window with display changed value opens
Confirm pop-up window with changed value
Enter and confirm pressure parameter "p2 - Pre-alarm"
e.g. 120 Pa (1.2 mbar)
Confirm pop-up window with changed value
… Follow the same procedure for the other pressure parameters
Deactivate programming switch
