7
(
Q
J
OLV
K
8
6
8.3 Functions selected via expansion
modules
Further functions are available via the GENI module
or the relay module:
8.3.1 GENI module
• External analog control of head or speed via a
signal from an external 0-10 V signal transmitter.
• External forced control via inputs for:
- Max. curve
- Min. curve.
• Bus communication via GENIbus
The pump can be controlled and monitored by a
Grundfos Control MPC Series 2000, a building
management system or another type of external
control system.
• External start/stop
The pump can be started and stopped via the =
digital input.
• Fault, ready and operating indication via signal
relay
The pump controls an external fault, ready and
operating signal relay via a potential-free output.
The function of the signal relay is set with the
R100.
8.3.2 Relay module
• External start/stop
The pump can be started and stopped via the
digital input.
•
Fault, ready and operating indication via
signal relay
The pump controls an external fault, ready and
operating signal relay via a potential-free output.
The function of the signal relay is set with the
R100.
8.4 Control modes
A GRUNDFOS MAGNA pump can be set to the
control mode which is most suitable for the individual
system.
Possible control modes:
•
AUTO
ADAPT
(factory setting)
•
Proportional pressure
•
Constant pressure.
Each of the control modes can be combined with
automatic night-time duty, see section 8.6 Automatic
nighttime duty.
AUTO
ADAPT
To be set on the control panel or with the R100, see
section 9. Pump setup.
The control mode AUTO
ADAPT
continuously adapts
the pump performance.
The setpoint of the pump has been factory-set as
follows and cannot be changed manually:
•
MAGNA 32-60 to 12 ft (3.6 m)
•
MAGNA 32-100 to 18 ft (5.5 m).
When the pump registers a lower pressure on the
max. curve, A
2
, the AUTO
ADAPT
function automati-
cally selects a correspondingly lower control curve,
H
set2
, thus reducing the energy consumption.
Fig. 5
AUTO
ADAPT
A
1
:
Original duty point.
A
2
:
Lower registered pressure on the max.
curve.
A
3
:
New duty point after AUTO
ADAPT
control.
H
set1
: Original
setpoint.
H
set2
:
New setpoint after AUTO
ADAPT
control.
H
fac.
:
Factory-set setpoint.
The AUTO
ADAPT
function can be reset by pressing
the button
for approx. 10 seconds until the control
mode is back to the starting point (AUTO
ADAPT
or
AUTO
ADAPT
with automatic
nighttime duty).
Proportional-pressure control
To be set on the control panel or with the R100, see
section 9. Pump setup.
The pump head is reduced at decreasing water
demand and increased at rising water demand; see
fig. 6.
Constant-pressure control
To be set on the control panel or with the R100, see
section 9. Pump setup.
The pump maintains a constant pressure, regardless
of water demand; see fig. 6.
Fig. 6
Pressure control
TM
02
02
51
48
00
T
M
00
55
46
45
9
6
H
max.
H
fac.
A
1
A
3
A
2
H
set2
H
set1
H
set
H
set
H
set
Proportional
pressure
Constant
pressure
