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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 10 Actuators X53 / X54 01.12.2009
10.3 Referencing
An incremental transducer is used to ensure position feedback. Hence, referencing of
the actuators must be performed after power-on. In addition, at the end of each shut-
down 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 actuators with detected position
errors to be referenced. During the following phase 10, the only actuators that are refer-
enced 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°).
No. Parameter
601
Selection of reference point
Index 0 = fuel
Index 1 = air
0 = closed (<0°)
1 = open (>90°)
602
Direction of rotation of actuator
Index 0 = fuel
Index 1 = air
0 = counterclockwise
1 = clockwise (exclusively for SQM3…)
603 Tolerance limit of position monitoring (0.1°)
Index 0 = fuel
Index 1 = air
Greatest position error where an error is securely detected
→ Error detection band: (P606 – 0.6°) up to P606
611 Type of referencing
Index 0 = fuel
Index 1 = air
0 = standard
1 = stop within the usable range
2 = internal stop
3 = both
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