94
5 Functional Description with Process Diagrams
5.2.5 CPI/POC - Closed Position Indication/Proof of Closure
5.2.5.1 Requirements
The gas valves to be monitored must be equipped with limit switches (CPI/POC).
5.2.5.2 Required Inputs/Outputs
CPI/POC input for 1
st
main valve for each fuel
CPI/POC input for 2
nd
main valve for each fuel
For a description of the digital inputs, see chapter 3.2 Digital Input/Output Functions
5.2.5.3 Required Parameters
5.2.5.4 Functional Description
The CPI/POC input monitors the position of the main valve to the CLOSED position by a limit
switch in the main valve.
As soon as the valve opens, the limit switch contact is also opened. If this contact does not
switch correctly, a fault shut-down is initiated.
t7 1
st
safety time P305 4.0 s
t8 Stabilization time P310 3.0 s
t9 2
nd
safety time P308 3.0 s
t11 Control release delay time P380 0.0 s
t12 Block and bleed of the gas train P334 3.0 s
t13 Post-ventilation time P319 0.0 s
t22 Program monitoring time P304 600 s
t23 Irrelevance time P323 2.0 s
Signal bar Significant times and their parameters Standard
P no. Description Attributes
329 Special functions of burner sequencer V1.0.0.0
0 = gas valve 1 opens together with pilot valve in the 1
st
safety time during ignition
1 = gas valve 1 opens together with gas valve 2 in the 2
nd
safety time during ignition
Write: 2/GUI/UI
Read: 0
Default: 0
Min.: 0
Max.: 7
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