Dual Pump Function; Operating Modes - salmson SIE Serie Instalacion Y Puesta En Servicio

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6.4

Dual pump function

Fig. 13: Example, DDG connection
InterFace module (IF-Module)

6.4.1 Operating modes

Main/readiness operation
Parallel operation
H
H
max
H
s
s
H
min
Fig. 14: Δp-c control (parallel operation)
64
NOTE
The properties described below are only available if the internal MP
interface (MP = Multi Pump) is used.
• Both pumps are controlled by the master pump.
If one of the pumps malfunctions, the other will run according to the
master's control settings. In case of a total failure of the master, the
slave pump operates at emergency operation speed.
The emergency operation speed can be set in menu <5.6.2.0> (see
Section 6.4.3 "Operation during interruption of communication" on
page 66).
• The master's display will show the status of the double pump. On the
slave display, 'SL' will appear.
• The master pump is the pump on the left by direction of flow. Connect
the differential pressure sensor to this pump.
The measuring points of the differential pressure sensor of the master
pump must be on the suction and pressure side of the double-pump
system in the corresponding collector pipe (Fig. 12).
For communication between pumps and the building management
system, one IF-Module (accessories) is required per pump. This is
plugged into the terminal space (Fig. 1).
• The master-slave communication uses an internal interface (terminal:
MP, Fig. 21).
• In double pumps, only the master pump has to be equipped with an
IF-Module.
Communication
PLR/interface converter
LONWORKS network
BACnet
Modbus
CAN bus
NOTE
The procedure and further information for commissioning and confi-
guring the IF-Module on the pump can be found in the installation and
operating instructions of the IF-Module used.
Each of the two pumps provides the configuration flow rate. The
other pump is available in case of malfunction or runs after pump
cycling. Only one pump runs at a time (see Fig. 10, 11 and 12).
In the partial load range, the hydraulic output is provided at the
beginning by one pump. The second pump will be switched on when
it is most effective to do this, i.e. when the total power consumption
P of both pumps in the partial load range is less than the power con-
1
sumption P
1
adjusted upwards to the maximum speed. (Fig. 14 and 15).
In manual control mode, both pumps always run synchronously.
Q
Master pump
IF-Module PLR
IF-Module LON
BACnet IF-Module
Modbus IF-Module
CAN IF-Module
of one pump. Both pumps will then be simultaneously
Slave pump
No IF-Module
necessary
No IF-Module
necessary
No IF-Module
necessary
No IF-Module
necessary
No IF-Module
necessary
Pompes Salmson 04/2012