Dungs MPA 5111, Руководство пользователя

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39 … 68
38 … 68
Printed in German
y • Edition 02.14 • Nr
. 254 722
9.2 Definition of terms
9.2.1 Burner capacity
Indicates the capacity and/or heat
produced by the burner. Typically,
the capacity is indicated in kWh.
9.2.2 Modulation degree
Normally, there is a difference be-
tween the modulation degree and
the burner capacity. However, it is
possible to program the MPA in a
way so that the two values comply
with each other!
It is possible to predefine the so-
called "modulation degree" of the
burner in the state "Standard mode"
on the MPA using several options
(see P72).
9.2.4. Special point
In order to define the respective
combinations for fan, stepped motor,
PWM 2 and PWM 3 also outside the
standard mode, there are the so-
called "Special points". They indicate
A specific combination of nominal
value for the fan, stepped motor
position and nominal value for PWM
2 and 3 is assigned to each modula-
tion degree via the curve segment.
That means that, if a new modula-
tion degree is predefined, the MPA
calculates the corresponding nomi-
nal values for the fan, for the stepped
motor, for PWM 2 and PWM 3.
Afterwards, the fan, the stepped mo-
tor, PWM 2 and PWM 3 are adapted
to the new value.
The modulation degree can be
changed in the range between 0 %
and 100 %.
Attention!
0 % (100 %) do not comply neces-
sarily to the lowest (highest) possible
burner capacity! The actual burner
capacity depends on the combina-
tion of all influencing values.
But the MPA can be set in a way
that 0 % of the modulation degree
complies to the minimum burner
capacity and 100% to the maximum
burner capacity. Minimum means in
this case not "Flame Off" / " No heat"
but "smallest possible flame". Also
the modulation degrees between
0% and 100% can be programmed
proportionally to the burner capacity.
A relationship between modulation
degree and burner capacity, how-
ever, is not necessary for the MPA.
the nominal values, for ex. during the
pre-aeration, the ignition, the post-
aeration, etc. These special points
are assigned to specific states. They
are not assigned to the modulation
degree, since these special points
must represent not valid combina-
tions of the curve segment.
9.2.3 Curve point
In the MPA, up to 30 curve points
can be programmed for the stand-
ard mode. At least 2 points must be
available: one for the modulation
degree 0 % and the second for a
modulation degree 100 %.
A curve point defines the nominal
value for the fan, the position of
the stepped motor and the nominal
values of the PWM signals 2 and 3 at
the assigned modulation degree.
For modulation degrees which are
not explicitly defined as a curve
point, the MPA calculates the re-
spective intermediate value from the
previous and the subsequent point
(linear interpolation).
2 curve points for the same modu-
lation degree are not allowed! The
curve points are automatically as-
sorted in increasing order according
to the modulation degree.
The programmed nominal values, for
example for the stepped motor, can
also be curves with changing curve
directions, that means that even a
curve can be programmed in the fol-
lowing way: