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Fig. 4: Example – differential pressure sensor
connection in y-pipe installation
Fig. 5: Insert IF module
4.3.1
Operating modes
12
Product description
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 "Operation during interruption of communication").
The master display shows the status of the double pump. On the slave, the display
shows 'SL'.
In the example, the master pump is the left-hand pump in the direction of flow. Con-
nect the differential pressure sensor to this pump!
The measuring points of the differential pressure sensor must be on the suction and
discharge side of the double-pump system in the common collector pipe.
Interface module (IF module)
For communication between pumps and the building management system, one IF mod-
ule (accessories) is required, which is plugged into the terminal room.
The master-slave communication uses an internal interface (terminal: MP).
For pumps in Y-pipe applications in which the electronic modules are connected to
each other via the internal interface, only the master pumps require an IF module.
Communication
PLR/interface converter
LONWORKS network
BACnet
Modbus
CAN bus
Table 1: IF modules
NOTICE
The procedure and further information for commissioning and configuring the IF
module on the pump can be found in the installation and operating instructions of
the IF module used.
Main/standby operation
Only one pump ever runs at a time. Each of the two pumps provides the configured flow
rate. The other pump is available in case of malfunction or runs after pump cycling.
Master pump
IF module PLR
IF module LON
BACnet IF module
Modbus IF module
IF module CAN
Slave pump
No IF module necessary
No IF module necessary
No IF module necessary
No IF module necessary
No IF module necessary
WILO SE 2020-10
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