Functional test and procedure
Ex p Control unit
SILAS
pz
Page 76 of 88
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Rev. 0
The Ex p control executes the following sequence during commissioning:
Functional flow diagram – dust
DANGER
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.
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)
Maximum pressures during operation and purge (p4 and p5),
depending on applied rinsing program
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
Activation
Safety state
- Ex p Control Unit -
Pressure-Condition
fulfilled
Ex p Equipment
in Ex safe state
Parameter mode
- Pre pressure exceeded
- Pressure
reached
-
Minimum pressure drop
-
Maximum pressure exceeded
-
Electronic failure
- Active parameter switch
