OPUS
SERIES
INSTALLATION, OPERATION, MAINTENANCE
AND REPAIR MANUAL
7
9. OPERATING MODES AND
SELECTION CRITERIA
OPUS circulation pumps, with their ECM technology,
provide operating modes that act in accordance with
the variable flow requirement.
As the working point of the pump shifts to the left, that is,
the flow rate decreases, the following occurs:
►
In manual mode, the head is increased.
►
In constant pressure operation mode, the speed
decreases and the head remains constant.
►
In variable pressure operating mode, the rotation
speed decreases linearly so that the head drops to half
of the set head value.
9.1 Manual Operating Mode
Figure 9.2: Manual Operation Mode Display
In this operating mode, the pump operates at the set
rotation speed. The desired speed can be selected.
9.2 Constant Pressure Operating Mode
Figure 9.3:
Constant Pressure Operating Mode Display
In this operating mode, the pump operates by changing
the rotation speed so that the set pump head (Hsetting)
remains constant.
The Hsetting value of the pumps selected in accordance
with the operating point is determined as follows:
►
The H value at the operating point is marked on the
constant pressure operating mode graph.
►
If the marked point is on any operating mode curve
belonging to a multiple of 0.5, the H value of that
operating mode curve is accepted as the Hsetting value.
►
If the marked point is not on any operating mode
curve belonging to 0.5 multiples, the nearest operating
mode curve is passed and the H value of that curve is
accepted as the Hsetting value.
The operating mode curves are plotted on the graph
at 1 meter intervals. The setting can be selected on the
screen in 0.5 meter increments.
9.3 Variable Pressure Operating Mode
Figure 9.5:
Variable Pressure Operating Mode Display
İzolasyon Vanası
İzolasyon Vanası
Şekil 4.2.4 B
H
setting
H
setting
/2
Pump Head
Flow Q (m3/h)
Pu
mp
H
ea
d
H
setting
Flow Q (m3/h)
OPUS Operating Modes
Manual
Constant pressure
Pu
m
p Head
Flow Q (m3/h)
Variable p ressure and constant
pressure operating m odes
provide energy s avings b y
following curves according to the
variable load requirement of the
system.
Pump Hea
d
Flow Q (m3/h)
