Nu-Way MDFL 3300, Руководство по установке и обслуживанию

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Modulating Control : Siemens RWF 40
Basic display
The diagram below shows the RWF40 after switching on the supply voltage. This conditions is called
the basic display. The actual valve and the currently active set-pint are shown here. Manual
operation, self-optimisation, the operating parameter and configuration levels can be activated from
here.
To change the working set point
The operating display shows the actual pressure/temperature of the boiler in red and the required set
point pressure/temperature beneath in smaller green digits. One quick press of the PGM button, the
display changes to show the set point as the larger red digits and the SPI in the lower small green
digits.
Alter the red display using the up/down buttons to show the new required set point, press exit or let
the unit time out to return to the basic display which should be the new set point figure.
To enter a new parameter
The parameters dictate the way in which the burner firing rate alters in response to changes in the
pressure/temperature of the boiler.
A major factor that determines the need to change the parameters is if the burner is fitted to a steam
or hot water boiler. The table below indicates the parameter and its setting for steam and hot water
boilers. It must be emphasised that it is only an indication and any departure from these settings
should be made in small increments, with time given to see how the burner is reacting to the changed
parameter.
Press and hold the PGM button down until the green set point figure changes to an AL, the larger
upper figures show the value. Use the up/down buttons to set the new values, press the PGM button
to enter the value and change to the next screen. To cancel an entry press exit. Scroll through the
screens, (PGM button) modifying any value found to be in error (up/down buttons). At the last screen
the PGM button will return the controller to the original display.
At any point in the procedure the original operating display can be obtained by letting the unit time out,
the value in the display at the time out will be accepted.
A value can only be altered within the permitted range of that parameter. All other parameters must
remain as supplied.
Note: The detector range parameters SCL & SCH are given as °C for Hot Water (temperature) and
bar for Steam (pressure).
MDFL 3300 & MDFL 4000 Issue 2 08/08 Page 35
K6
PGM EXIT
SIEMENS
Landis & Staefa RWF40
Burner enable
Reduce output
Increase output
Manual operation
Limit comparator
Increase value
Exit key
Process value display (red)
Setpoint display value (green)
Reduce value
PGM key
RWF Recommended Settings
Parameter Display
Hot
Water
Steam
Proportional
band
Pb1 10 1
Derivative
time
Dt 10 5
Reset time Rt 50 20
Actuator time Tt
Set to the air Damper
running time between
low and high flame
Switch on
threshold
Hys 1 0 0
Upper off
threshold
Hyst 3 99.9 999.9
Detector:
range start
SCL 0 0
Detector:
range end
SCH 100 25