Commissioning
Ex p control unit
Motor Purge Controller
Page 70 of 96
01-37A2-7D0003_Operating instructions_MPC_20210923_0_en.docx
Rev. 0
Purging programmes gas applications:
Progra
mm
e
A
p
p
lic
a
ti
o
n
Functions
Purging
phase
Purging time
starts when
p3 has been
exceeded
Purging
time stops
when p5
has been
reached
Ex p active after
Ex p
inactive
after
Ex_p_1
Gas
Yes
Yes
Yes
purging time has elapsed
po < p1
po > p4
Ex_p_2
Gas
Yes
Yes
Yes
purging time has elapsed
po < p1
Ex_p_4
Gas
Yes
Yes
No
purging time has elapsed
po < p1
po > p4
Ex_p_5
Gas
Yes
Yes
No
purging time has elapsed
po < p1
8.1.4.2
“Ex p Parameters / Pressure parameters” setting
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 the initial commissioning.
The following values can be used as basic settings:
po = 2.5 mbar (250 Pa)
p1 = 1.0 mbar (100 Pa)
p2 = 1.5 mbar (150 Pa)
p3 = automatic determination by Ex p control unit
p4/ P5 = Application-dependent, e.g. pressure-sensitive components?
Procedure
Connect the PC with the Ex p control unit and activate the programming
switch
Log into the WEB interface with the user level
Call up the menu “Purging parameters / Pressure parameter”
Enter the “po - operating overpressure” parameter and confirm
e.g. 250 Pa (2.5 mbar)
The value “po” is the internal operating overpressure of the pressurised
enclosure. This value is monitored by the Ex p control unit and
compensated, if necessary.
A pop-up window displaying the changed value opens;
Confirm the pop-up window with the changed value
Enter the pressure parameter “p1 - minimum pressure” and confirm
e.g. 100 Pa (1.0 mbar)
A pop-up window displaying the changed value opens;
Confirm the pop-up window with the changed value
Enter the pressure parameter “p2 – pre-alarm” and confirm
e.g. 150 Pa (1.5 mbar)
Confirm the pop-up window with the changed value
… Follow the same procedure for the other pressure parameters
Deactivate the programming switch
