Dual Pump Operation - Wilo Stratos Betriebsanleitung

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6.2.5 Dual pump operation

Double pumps or two single pumps (installed in parallel) can be retrofitted with
an integrated dual pump management system.
• IF-Modules Stratos: For communication between pumps, an IF Module is
installed in the control module of each pump. These IF Modules are connected
to each other via the DP interface.
This dual pump management has the following functions:
• Master/slave: Both pumps are controlled by the master. All setting are made at
the master.
• Main/standby mode: Each of the two pumps provides the configured flow rate.
The other pump is available in case of a malfunction or runs after pump cycling.
Always only one pump runs. Main/standby mode is also fully active with two sin-
gle pumps of the same type in one double pump installation.
• Efficiency-optimised peak-load operation: In the partial load range, the
hydraulic output is provided at the beginning by one pump. The second pump is
then also connected for efficiency optimisation if the total power consumption
P of both pumps is less than the power consumption P
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pumps are then simultaneously adjusted upwards to the maximum speed. This
operating mode (load-sensitive activation/deactivation) achieves additional
energy savings compared to conventional peak-load operation. Parallel opera-
tion of two single pumps is only possible for pumps for which there is an equiv-
alent double pump type.
• If one of the pumps has a breakdown/fault, the other pump runs as single pump
in the operating modes specified by the master. The reaction in the event of a
fault depends on whether HV or AC operating mode is active (see Chapter 6.2.1).
• In the event of a communication failure (e.g. due to the power supply failing at
the master pump): After 5 seconds the slave starts and runs according to the last
specification of the operating modes by the master pump.
• Pump cycling: If only one pump is running (in main/standby, peak load or set-
back operation), pump cycling takes place after every 24 hours of effective run-
ning time. Both pumps run at the time of pump cycling in order to ensure that
operation is not interrupted.
NOTE: Both pumps always run if both manual control mode and synchronous
mode are active at the same time. No pump cycling takes place.
No pump cycling takes place during active night reduction after 24 h of effec-
tive running time.
• SSM: The contact of the collective fault signal (SSM) can be connected to a cen-
tral control centre.
SSM contact is only assigned at the master pump: Only the faults of the master
are indicated ("SSM single" factory setting). If the faults are to be indicated by
both master and slave pumps, an IR operating and service unit (accessory) must
be used to program the SSM function at the master pump to "SSM combined"
(see Installation and operating instructions for IR-Monitor/ IR-Stick). The signal
60
of one pump. Both
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WILO SE 12/2012