Siemens LMS14 User Manual page 529

Release QAA fan param
Key
Fan PWM-Min prepurg
Building Technologies Division
Line no. Operating line
[4337.1] Release QAA fan param
Off
On
Under certain conditions, the fan parameters for ignition load, low-fire, high-fire,
prepurging and postpurging can be set via the QAA75.../AVS37... Since these fan
parameters are basically in the safety-related area and – as a general rule – safety-
related values cannot be changed via the QAA75.../AVS37..., following applies:

The respective parameters are available in 2 groups (both safety-related and non-
safety-related)

The change between the 2 parameter groups can be parameterized via the safety-
related flag Release QAA fan param [4337.1]
Off
Fan parameters cannot be changed via the operator terminal.
On
Fan parameters can be changed via the operator terminal.
Overview of safety-related and non-safety-related parameters:
Parameters QAA75.../ AVS37...
Required speed prepurging (9504) ≥
Required speed ignition (9512) ≤
Required speed LF (9524) ≥
Required speed HF (9529) ≤
Prepurge time (9500) ≥
Postpurge time (9540) ≥
Line no. Meaning
9504 N_Vor_QAA Speed required for prepurging (QAA)
9505 N_Vor Minimum speed required for prepurging
9512 N_ZL_QAA Speed required for ignition
9513 N_ZL Maximum speed required for ignition
9524 N_TL_QAA Speed required for low-fire
9525 N_TL Minimum speed required for low-fire
9529 N_VL_QAA Speed required for high-fire
9530 N_VL Maximum speed required for high-fire
9500 Tv_QAA Prepurge time
9501 Tv Derivative action time
9540 Tn_QAA Postpurge time
9542 Tn Integral action time
Line no. Operating line
[4352.1] Fan PWM-Min prepurg
Minimum fan PWM during prepurging for monitoring the fan speed.
User Manual LMS14...
6 The settings in detail
Safety-related parameters
Req speed prepurging min (9505)
Required speed ignition max (9513)
Required speed LF min (9525)
Required speed HF max 9530)
Prepurge time min (9501)
Postpurge time min (9542)
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CC1U7471en
28.01.2015