Grundfos MAGNA 2000 Series, Installation And Operating Instructions Manual

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7.12 GENI module
The GENI module offers the following functions:
• External analog 0-10 V control
• External forced control
• Bus communication via GENIbus
• Control of twin-head pumps.
7.12.1 Control of twin-head pumps
Twin-head pumps have a GENI module incorporated
in each control box. The modules are internally
connected via a wire.
Fig. 17 Master/slave pumps
For connection of the communication cable between
the GENI modules, see pages 345 and 346.
Twin-head pumps are factory-set to the control mode
AUTO
ADAPT
and the operating mode "alternating
operation", which is described below.
Operating modes:
• Alternating operation
Pump operation alternates every 24 hours. If the
duty pump stops due to a fault, the other pump
will start.
• Standby operation
One pump is operating continuously. In order to
prevent seizing-up, the other pump will start at a
fixed frequency and run for a short period. If the
duty pump stops due to a fault, the other pump
will start.
7.12.2 Selection of operating mode
Select the operating mode by means of the
mechanical contact in each module.
Fig. 18 Mechanical contact
Operating the pump
Twin-head pumps can be set and operated in the
same way as single-head pumps. The duty pump
uses its setpoint setting, whether it is made on the
control panel, with the R100 or via bus.
7.13 LON module
The LON module offers the possibility of connecting
the pump to a LonWorks network. The module is
used for data transmission between a network and
pumps of the type MAGNA 32-120, 40-120, 50-120,
65-120, 50-60 and 65-60.
For further information, see the documentation files
on the floppy disk supplied with the LON module.
TM
03
46
35
24
06
Note
In air-conditioning systems, standby
operation is recommended to minimise
condensation inside the pump.
Master Slave
Flow direction
Operating
mode
Left pump
head
Right pump
head
Alternating Alternating Alternating
Standby Alternating Standby
Standby Standby Alternating
Standby Standby Standby
TM
02
02
43
09
04
Note
Both pumps should be set to the same
setpoint and control mode. Different
settings will result in different
operation when changing between the
two pumps.
Alternating
operation
Standby operation