Siemens LMU54 Series, Основная документация

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
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0 10 20 30 40 50 60 70 80 90
NqmodNenn
(= 18)
Caculated
speed
for NqmodMin
(= 6)
QmodDrehzStufen
(= 30 )
QmodMin
(= 3 %)
NqmodMin (= 40)
QmodMax
(= 82 %)
100 %
Modulating range
of pump
7494d38E/0102
Speed [-]
Degree of modulation (PWM) [%]
Adaption of modulating pump to the heating plant
Mandatory settings. Parameterization to be made by the OEM!
Number of speeds supported by the PWM pump. A minimum of 2 speeds need to be
set. This value can be obtained from the speed characteristic = f (PWM) or from the
pump supplier’s specifications.
Minimum degree of modulation of the PWM pump at maximum speed «QmodDrehzStufen».
This value can be obtained from the speed characteristic = f (PWM) or from the pump
supplier’s specifications.
Maximum degree of modulation of the PWM pump at speed = 1.
This value can be obtained from the speed characteristic = f (PWM) or from the pump
supplier’s specifications.
Minimum pump head of the PWM pump (zero pump head at Q = 0) at minimum speed
(speed = 1) according to the supplier’s specifications. This value can be obtained from
the H-Q chart or from the pump supplier’s specifications.
Maximum pump head of the PWM pump (zero pump head at Q = 0) at maximum speed
(speed = QmodDrehzStufen) according to the supplier’s specifications. This value can
be obtained from the H-Q chart or from the pump supplier’s specifications.
To be readjusted only if required or in the event of problems!
Filter time constant of the digital filter used for filtering the actual values of the flow and
return temperatures for the
∆
T supervision. This filter has a diminishing memory.
The default value of «Klambda1» is set to 0.99 (
τ ≈
20 seconds).
Factor for calculating the sampling time of
∆
T control. The sampling time of
∆
T control is
a multiple of the sampling time of boiler control (ZAbtastK).
The default value of «KtAbtastDt » is 10. If this parameter is changed, the controller
parameters must be adapted also.
Adaption of modulating
pump to the heating plant
Parametes of the
PWM pump (OEM)
QmodDrehzStufen
QmodMin
QmodMax
FoerderMin
FoerderMax
Preset parameters
Klambda1
KtAbtastDt