Ex p control unit
Motor purge controller
Operation
Rev. 0
01-37A2-7D0003_Operating instructions_MPC_20210923_0_en.docx
Page 61 of 96
7.15
Optional sensors
Upon delivery, the “Optional sensors” are deactivated and can be
activated if required.
The Ex p control APEX with additional pressure
monitoring is based on the standard version. Purging
and operating phase are carried out in the same way.
The deviation from the standard is during the
operating phase. By means of two optional
connectable pressure sensors during the operating
phase, the control unit also monitors that the
operating equipment is at minimum pressure.
Procedure:
Connect the PC with the Ex p control unit
Activate the programming switch
Log in to the WEB interface with the user level
Call up the “Extended / Sensors” menu
You can activate the “Pressure sensor” function under Current sensor 1
and Current sensor 2 in the displayed table displayed. In addition, the
minimum and maximum measuring range of the sensor must be entered.
Confirm pop-up window with the changed value(s)
Call up the “Pressure parameters” menu and enter the required setpoints
for the optional pressure sensors “pa and pb”.
e.g. specify pa - pressure sensor A with a trigger value of 2.00 mbar.
If the value falls below 2.00 mbar at the measuring point, the
associated Ex p equipment is deactivated.
Confirm pop-up window with the changed value(s).
Active pressure sensors are marked as active in the “Purge
parameters/Purge modes” menu for the associated purge program.
Deactivate programming switch
Allow purging phase to run
Functional test: Ex p operating equipment is deactivated if the pressure
falls below the limit.
Additional purging via a signal
Additional purging can be activated on the Ex p control unit by means of the
current inputs. In this case, the Ex p operating equipment remains in the
operating phase and it can be purged once again. In order to use this function,
the “Additional purging” function must be activated in the “Extended / Sensors”
parameter menu for the associated current input.
4 mA = purging with active operating phase
7 mA = normal operating phase
