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5. Control of twin-head pumps
It is possible to connect two single-head pumps so that they operate as a
twin-head pump.
Fit a GENI module in the terminal box of each of the two single-head pumps
and connect the modules using a wire.
Master pump (the pump which is going to start first) connection: Connect a
jumper across terminals "X" and "Q", see example on page 86.
Slave pump connection: Connect the pump as shown in the example on
page 87.
The pumps can be set to one of the following 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 pre-
vent seizing-up, the other pump will start at a fixed frequency. If the duty
pump stops due to a fault, the other pump will start.
The operating mode is selected by means of a mechanical contact in each
module. The contacts in the two modules must be set to the same position.
If the contacts are positioned differently, "standby operation" is selected.
Fig. 4
Operating the pump:
The connected pumps can be set and operated in the same way as single-
head pumps. The duty pump uses its setpoint setting, whether it was made
by means of the control panel, via the R100 or via bus.
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.
68
Alternating operation
Standby operation
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