ABB ACS 800 Series Manuale d'uso - Pagina 13
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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