Ex p Control unit
SILAS
pz
Functional test and procedure
Rev. 0
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Page 75 of 88
9
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 SILAS control unit and secure to prevent it restarting.
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
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)
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
