ABB ACS 800 Series Podręcznik użytkownika - Strona 13
Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Jednostka sterująca ABB ACS 800 Series. ABB ACS 800 Series 14 stron. Converter modules with electrolytic dc capacitors in the dc link
Również dla ABB ACS 800 Series: Uwaga dotycząca instalacji (2 strony), Podręcznik (16 strony)
Drukuj stronę
Q
H
n
P
In the calculation sheets, calculations are at single points for Q = 20% to 100%
of nominal pump flow Qn. Q is the actual flow. H is the total dynamic head at
flow Q. The efficiency figures are multiplied with k-factors witch take into
account operating conditions with some accuracy. These correcting factors are
defined based on experience.
Efficiency
100 %
DRIVE
95 %
80 %
Graph 2. Typical efficiencies.
This gives the following formulas for power calculations:
Frequency converter control
Pvsdi
p
kmi
Qi
Qn
kvsdi
table
Throttling control, assuming constant motor efficiency
Qi
Pthi
p
kpi
Qi
2
4 .
ON/OFF control, assuming constant motor and pump efficiency
P
ON
OFF
_
avg
. 0
981
n
p
MOTOR
PUMP
Qi
Hsi
. 9
81
m
kmi
kvsdi
*
vsd
0
2 .
0
2 .
Hst
Hn
Hpi
. 9
81
, where
kpi
m
. 1
44
Qi
Qn
Qn
Qi
Hn
. 9
81
p
m
vsd
m
p
Flow
, where
13