Dungs MPA 5111, Руководство пользователя

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16 … 68
Printed in German
y • Edition 02.14 • Nr
. 254 722
7.6 State description
MPA 5111
State xx Designation Description
15 Pre-aeration B This time is a second pre-aeration time.
Contrary to the "Pre-aeration A" state, this state is skipped
if the last switch-off of the MPA was a regular switch-off
with successful valve tightness test. Moreover, no power
failure must have been occurred since the last switch-off.
This state can be used, for example, to realise a "Reduced
pre-aeration" whose duration (P61) is defined in the state
"Pre-aeration B" and the duration of the "Pre-aeration A"
(P60) is set to 0 seconds or to the minimum required pre-
aeration time.
Please observe: The actual pre-aeration time increases by
the time for the valve tightness tests (P40 to P45) in the
startup phase, if they are activated.
See also section 7.2.3 "Operation with reduced pre-aera-
tion".
16 Ignition position The MPA moves to the special modulation point "Ignition
position".
This state lasts as long as the stepped motor has reached
its new position and the fan works with the set speed. The
fan monitoring of the MPA waits until the fan has swung
into the regular operation (detection of upper and lower
limit in the tolerance range).
17 Gas detection GDWVPS The valve 1 is opened so that a gas pressure can be built
up between the valves and the GDWVPS can detect a gas
pressure (P62). If both types of valve test (startup P40 and
switch-off P41) are deactivated, the GDWVPS is not moni-
tored! A bridge is not necessary.
18 Pre-ignition The ignition is already activated here (P63) without open-
ing valve 2. The valve output 1 is already active!
19 SZA - Ignition During this period (P64), the ignition remains active and
valve 2 is open. The gas can flow now and a flame can be
generated.
This state is 0.5 seconds shorter than the time set in P64
because the safety time for startup is divided in state 19
and 20!
20 SZA - Flame detection The ignition is deactivated 0.5 seconds before the end
of the safety time for startup (P64) and the procedure for
flame detection (ionisation input) is started.
If an ionisation current is detected, the MPA reports a
flame.
21 Stabilisation flame A The flame can be stabilised with the help of a configurable
special modulation point. The duration of the stabilisation
phase (P65) can be configured.
22 Stabilisation flame B Another special modulation point can be defined for this
stabilisation phase (P66). When using the MPA with pilot
burner, this state can be used to activate the main flame.
The main gas valve (=additional valve) can be activated af-
ter an adjustable time (P50 and P52) after the changeover
to the state.
See also section 7.4.4 Operation with ignition gas flame
23 Changeover to the standard mode The MPA leaves the current special modulation point and
moves to the start simulation point of the standard mode
(P67).