Actuators References; Gas Proving System; Air-Fuel Curve Points - Siemens AZL2 Series Service Manual

Actuators references

An incremental transducer is used to ensure position feedback. Referencing of the actuators must be performed after power-on. In
addition, at the end of each shutdown in phase 10, the actuators are referenced to ensure that individual stepping errors, which could
lead to shutdown, do not accumulate. If a position error occurs, the system switches to the safety phase (phase 01), enabling the actua-
tors with detected position errors to be referenced. During the following phase 10, the only actuators that are referenced are those that
were not referenced before in the safety phase (phase 01). The position of the reference point can be selected depending on the type
of burner design, either the CLOSED position (<0°) or the OPEN position (>90°).
Param. Descrizione
Impostazione punto di riferimento
Indice 0 = combustibile
601
Indice 1 = aria
0 = chiuso (<0°)
1 = aperto (>90°)
If the acutators position is exchanged (error code: 85), the burner will lockout and will try to adjust for three times, then it will lock out.

Gas proving system

Valve proving is only active when firing on gas. This is a leakage test designed to detect leaking gas valves and, if necessary, to pre-
vent the valves from opening or ignition from being switched on. Lockout is initiated. When performing valve proving, the gas valve on
the burner side is opened first to bring the test space to atmospheric pressure. Then, the valve is closed whereupon the pressure in the
test space must not exceed a certain level, measured by the gas leakage pressure switch (PGCP). Then, the gas valve on the mains
side is opened to fill the gas pipe. When the valve is closed again, the gas pressure must not drop below a certain level. Valve proving
can be parameterized to take place on startup, shutdown, or on both phases.

Air-fuel curve points

There are 10 air-fuel curve points: T
P0 = ignition position. Only for ignition; after the ignition, the burner works between Point P1 (low flame) and point P9 (high flame)
without going back to P0.
P0 can be set everywhere irrespective of all the other points.
Description
Selection of reference point
Index 0 = fuel
Index 1 = air
0 = closed (<0°)
1 = open (>90°)
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