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LMU... plausibility checks
of the speed parameters
Parameterization of
speed feedback signal
24/171
Siemens Building Technologies
HVAC Products
If the setpoint lies above the threshold value, starting from the threshold value, the
control value will approach the setpoint in accordance with the maximum slope (ramp)
defined by parameters «VmLauf» and «VmLaufBetr».
If the setpoint lies below the current control value, the control value will approach the
setpoint in accordance with the ramp (VmLab, VmLabBetr). This also applies in the case
the setpoint is lower than the threshold value.
If the setpoint equals zero, which means that the fan shall be switched off, first the
control value will be reduced in accordance with the ramp until it is smaller than or equal
to the threshold value. Only then will the control value be reduced to zero.
Fault
Check PWM control values of the fan for plausibility in relation to other parameters:
LmodZL > LmodVL
LmodTL > LmodZL
LmodNull > LmodTL
Check speed parameters of the fan for plausibility in relation to other parameters:
N_TL > N_VL
N_VOr > NoG_Max
N_VL + N_VL_Delta > NoG_Max
N_ZL + N_ZL_Delta > N_VL + N_VL_Delta
N_VOr - N_VOr_Delta < NoG_Null
N_ZL - N_ZL_Delta < N_TL - N_TL_Delta
N_TL - N_TL_Delta < NoG_Null
N_Nachstell_Delta ≥ N_ZL_Delta
or N_Nachstell_Delta ≥ N_Vor_Delta
The fan's speed feedback signal can be parameterized.
Parameter:
Fan pulses (in «FaEinstellFlags3»)
Available choices: 2, 3 or 4 pulses per revolution
Basic Documentation LMU54... / LMU64...
3 Functions
Display of fault on the
PC tool
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CC1P7494en
07.11.2002
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