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Ex p Control Unit
SIEMENS Set
Function check and sequence
Rev. 0
01-37A2-7D0004_SIEMENS_Manual_Exp-Control-Unit_20220216_0_en.docx
Page 63 of 80
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9
Function check and sequence
Safety during operation
DANGER
DEATH OR SERIOUS BODILY INJURY DUE TO DAMAGED EXPLOSION PROTECTION
MEASURE.
It is no longer possible to operate the control unit safely.
Danger of explosion
Put APEX control unit out of operation and ensure that it is not restarted.
Function flow diagram of the Ex p control unit
The operation of a pressurized device can be divided into three phases.
Flow diagram of the Ex p control unit
The Ex p control executes the following sequence during commissioning:
Activation
Safety state
- Ex p Control Unit
-
Pre-Purge-
Condition fullfilled
Purge time
counts down
Ex p Equipment
in Ex safe state
Parameter mode
- Pre pressure exceeded
(p1)
- Flow
Reached (p3)
- Countdown
ready
-
p1 pressure drop
-
p4 pressure exceede
-
Electronic failure
- Active parameter switch
Operating flow
Содержание Ex p Control Unit APEX
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