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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
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 Display of fault on the
PC tool
Check PWM control values of the fan for plausibility in relation to other parameters:
LmodZL > LmodVL 218
LmodTL > LmodZL 219
LmodNull > LmodTL 220
Check speed parameters of the fan for plausibility in relation to other parameters:
N_TL > N_VL 221
N_VOr > NoG_Max 222
N_VL + N_VL_Delta > NoG_Max 223
N_ZL + N_ZL_Delta > N_VL + N_VL_Delta 224
N_VOr - N_VOr_Delta < NoG_Null 225
N_ZL - N_ZL_Delta < N_TL - N_TL_Delta 226
N_TL - N_TL_Delta < NoG_Null 227
N_Nachstell_Delta ≥ N_ZL_Delta
or N_Nachstell_Delta ≥ N_Vor_Delta
503
The fan’s speed feedback signal can be parameterized.
Parameter: Fan pulses (in «FaEinstellFlags3»)
Available choices: 2, 3 or 4 pulses per revolution
LMU... plausibility checks
of the speed parameters
Parameterization of
speed feedback signal
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