Dungs MPA 5111 User Manual

17 … 68
16 … 68
Printed in Germany • 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-o of the MPA was a regular switch-o
with successful valve tightness test. Moreover, no power
failure must have been occurred since the last switch-o.
This state can be used, for example, to realise a "Reduced
pre-aeration" whose duration (P61) is dened 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-o 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 ow now and a ame 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
ame detection (ionisation input) is started.
If an ionisation current is detected, the MPA reports a
ame.
21 Stabilisation ame A The ame can be stabilised with the help of a congurable
special modulation point. The duration of the stabilisation
phase (P65) can be congured.
22 Stabilisation ame B Another special modulation point can be dened for this
stabilisation phase (P66). When using the MPA with pilot
burner, this state can be used to activate the main ame.
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 ame
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).

Dungs MPA 5111 Specifications

General

Brand	Dungs
Model	MPA 5111
Category	Control Unit
Language	English