Wilo Stratos MAXO Notice De Montage Et De Mise En Service page 91

• Efficiency-optimized peak-load operation (parallel operation):
In peak-load operation (parallel operation), the hydraulic output is provided jointly by both pumps.
In the partial load range, the hydraulic output is initially provided by just one of the two pumps.
If the sum of the electrical power consumption P1 of both pumps in the partial load range is less than the
power consumption P1 of one pump, then the second pump is switched on with optimized efficiency.
This operating mode optimizes operational efficiency compared to conventional peak-load operation (ex-
clusively load-sensitive switching on and off).
If only one pump is available, the remaining pump takes over the supply. The possible peak load is limited
due to the power of the single pump. Parallel operation is also possible with two single pumps of the same
type in twin-head pump operation in the Y-piece.
• Pump cycling:
The actively operated pump is regularly changed automatically to guarantee even usage of both pumps in
the event of single pump operation. If only one pump (main/standby, peak load, or night setback) is run-
ning, the pump being operated is changed after a running time of 24 h at the latest. Both pumps run at the
time of pump changeover so that operation is not interrupted. The operated pump can be replaced at least
every 1 hour and can be set in length increments up to a maximum of 36 hours.
NOTICE
The remaining time until the next pump cycling is recorded via a timer.
The timer stops if there is a power interruption. After switching the power on again, the re-
maining time until the next pump cycling continues to run.
The count does not start again from scratch!
• SSM/ESM (collective fault signal/individual fault signal) in twin-head pump operation:
–
The SSM function must preferably be connected to the main pump. The SSM contact can be config-
ured as follows:
The contact reacts either only in the event of a fault or in the event of a fault and a warning.
Factory setting: SSM only reacts in the event of a fault.
Alternatively or additionally, the SSM function can also be activated on the standby pump. Both con-
tacts work in parallel.
–
ESM: The ESM function of the twin-head pump can be configured on each head of the twin-head
pump head as follows: The ESM function on the SSM contact only signals faults of the respective pump
(individual fault signal). In order to record all faults of the two pumps, both contacts must be assigned.
• SBM/EBM (collective run signal/individual run signal):
–
The SBM contact can be assigned to any of the two pumps. The following configuration is possible:
The contact is activated when the motor is in operation, power supply is present, or no fault is
present.
Factory setting: ready for operation. Both contacts signal the operating status of the twin-head
pump in parallel (collective run signal).
–
EBM: The EBM function of the twin-head pump can be configured as follows:
The SBM contacts only signal run signals of the respective pump (individual run signal). In order to
record run signals of both the pumps, both contacts must be assigned.
• Communication between pumps:
Communication for a twin-head pump has been set at the factory.
First, the bus Wilo Net must be installed with a cable between both electronic modules when connecting
two single pumps of the same type to a two-pump system (in the Y-piece joint).
Then set the termination as well as the Wilo Net address in the menu under "Settings/external interfaces/
Wilo Net setting" (see section "Use and function of the Wilo Net interface" [" 121]). Then configure the
Installation and operating instructions • Wilo-Stratos MAXO/-D/-Z • Ed.02/2023-10
en-US
91