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5.3.3
Further operating modes
14
If there is no "external off" message and no fault, and the drives and the automatic system
are activated, one or more speed-controlled pumps (Fig. 7) start when the value falls below
the activation threshold (2). The pumps run at a common, synchronous speed. Only pumps
that are switching on or off may briefly run at a different speed.
•
Control setting→Standby→Drives, automatic
•
Set the activation threshold individually for each pump: Control setting→Setpoint-
s→Switching on and off of BLP
Depending on the hydraulic output requirements of the system, the number of running
pumps varies and their speed is controlled so that the p-v setpoint curve (1) is followed.
The control device minimises the energy demand of the unit.
If only one pump is still active and the demand continues to drop, the base-load pump
switches off when the deactivation threshold (3) is exceeded and after the delay time has
elapsed, if necessary, after a zero-flow test.
•
Set the activation threshold individually for each pump: Control setting→Setpoint-
s→Switching on and off of BLP
•
Set the delay times: Control setting→Setpoints→Delays
Fig. 10: p-v setpoint curve
1
p-v setpoint curve
2
Activation threshold
3
Deactivation threshold
Delay times can be set for activation and deactivation of the peak-load pump.
•
Set the delay times: Control setting→Setpoints→Delays
Zero-flow test (only SCe version)
When operating only one pump in the lower frequency range and with constant pressure, a
zero-flow test is carried out cyclically. This briefly increases the setpoint to a value above
the deactivation threshold of the base-load pump. If the pressure does not drop again after
the higher setpoint has been reset, there is a zero-flow and the base-load pump is
switched off after the follow-up time has elapsed.
•
Set the deactivation threshold: Control setting→Setpoints→Switching on and off of BLP
•
Set the delay time: Control setting→Setpoints→Delays
In the p-v control mode, a potential zero flow reduction is tested by reducing the setpoint.
If the actual value drops to the new setpoint during the reduction, there is no zero-flow.
The parameters of the zero-flow test are preset at the factory and can only be changed by
Wilo customer service.
Cyclical pump change
In order to ensure that the load is distributed as evenly as possible between all pumps and
to balance the running times of the pumps, various pump cycling mechanisms can be used.
•
The base-load pump is cycled for each requirement (after deactivation of all pumps).
Installation and operating instructions • Wilo-Control SC2.0-Booster • Ed.01/2023-09
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