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Standardization
Note
Note
5921
17.1.3 Configuration of speed acquisition
The speed sensor to be used must be an inductive sensor (Namur or open collector
(pnp) (refer to subsection Inputs / Outputs). The motor speed is acquired with an asym-
metric sensor disk having 3 protrusions spaced at 60°, 120° and 180° respectively. The
number of protrusions must be appropriately parameterized. The sensor disk is to be fit-
ted such that the pulse intervals are generated in the direction of rotation as described.
Since the different types of motors have different maximum speeds, the VSD module must
know the speed that corresponds to 100 %.
Parameter
Num Puls per R
Since the standardized speed is difficult to adjust – but the correct adjustment has a
great impact on the control performance of the VSD module – an automatic measurement
function has been implemented.
The speed should be standardized in standby mode.
The speed will not be standardized when parameter VSD is deactivated
For speed standardization to start, both safety loop and burner flange contact
must be closed
When activating this function, the air actuators (all actuators parameterized for determin-
ing the amount of air) will first be driven to the prepurge position. The prepurge position
of the air actuators / actuators determining the amount of air should be adjusted such
that the damper is fully open.
This action can be watched on the menu «Ratio Control»
«Curve Parameters»
Then, the VSD will be controlled at 95 %. A reserve of 5 % is left, enabling the VSD
module to safely reach the 100 % speed in situations where environmental conditions
may change. Once the motor speed has stabilized, that speed will then be standardized.
In other words, that speed will represent 100 %. That speed can be read using parameter
«StandardizedSp».
«StandardizedSp» should not be parameterized manually.
If, based on the steps described above, the burner's rated output cannot be reached
(the fan is controlled at 47.5 Hz), proceed as follows:
Set the maximum frequency to 105.2 % of the motor's nominal speed
This means that at a motor frequency of 50 Hz:
Parameterize the maximum frequency of the VSD to 50 Hz 1.052 = 52.6 Hz (on the
VSD)
Then, standardize
This standardization cannot lead to motor overloads since only 95 % of the maximum
control signal is delivered during standardization and the actual speed will be controlled
later in operation and monitored with «Safety time ratio control».
If automatic speed standardization is activated, or if the standard-
ized speed is changed, the burner must be readjusted! Any change
to the standardized speed changes the assignment between the
parameterized percentages on the curves and the speed.
Parameter
Standard (deactivated / activated)
StandardizedSp
58
«Settings»
«Gas / Oil»
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