Ex p Control unit
APEX
mv
Functional test and procedure
Rev. 0
01-37A2-7D0005_MV_Manual_Exp-Control-Unit_2021005_0_en.docx
Page 67 of 80
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Functional test and procedure
Safety during operation
DANGER
DEATH OR SERIOUS INJURY CAUSED BY DAMAGED EXPLOSION PROTECTION
MEASURE.
Safe operation of the control unit is no longer possible.
Risk of an explosion
Deactivate the APEX control unit and secure to prevent it restarting.
RISK OF DEATH OR SERIOUS INJURY WHEN INCORRECTLY SETTING THE PRESSURE
PARAMETERS
Risk of an explosion.
Set the pressure parameters carefully and conduct a functional test.
Functional flow diagram for the Ex p control station
Operation of pressurized equipment can be divided into two or three phases.
With gas applications there are three phases, while with dust applications there
are just two because the purge phase is replaced here by manual cleaning.
Ex p control flow chart
With the previous chapters the required parameters and functions were defined
and stored to the control unit.
The following parameters have been defined.
Purge program / Purge mode
Operating pressure for the Ex p equipment (po)
Shutdown when pressure falls below minimum (p1)
Pre-alarm for minimum pressure (p2)
Purge pressure (p3), depending on "Manual / Automatic" purge modes
Maximum pressures during operation and purge (p4 and p5),
depending on applied rinsing program
Applied pressure outlet device, for automatic purging
Volume of protected Ex p equipment, for automatic purging
The Ex p control executes the following sequence during commissioning:
Activation
Safety state
- Ex p Control Unit -
Pre-Purge-Condition
fullfilled
- Ex p Control Unit -
Purge time
counts down
- Ex p Control Unit -
Ex p Equipment
in Ex safe state
Parameter mode
- Pre pressure exceeded
- Flow
reached
- Countdown
ready
-
Minimum pressure drop
-
Maximum pressure exceeded
-
Electronic failure
- Active parameter switch
