Additional Control Functions - Wilo -Stratos GIGA2.0-I Einbau- Und Betriebsanleitung

en
11.2

Additional control functions

11.2.1 No-Flow Stop
11.2.2 Q-Limit Max
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The PID controller used in the pump is a standard PID controller.
The controller compares the measured actual value with the specified setpoint and at-
tempts to match the actual value to the setpoint as closely as possible.
Provided the appropriate sensors are used, various controls can be implemented.
When selecting a sensor, attention must be paid to the configuration of the analogue input.
The control behaviour can be optimised by changing the P, I and D parameters.
The direction of control action can be adjusted by switching the control inversion on or off.
The additional control function "No-Flow Stop" continuously monitors the actual volume
flow of the heating/cooling system.
If the volume flow decreases due to closing valves and falls below the "No-Flow Stop Limit"
threshold set for No-Flow Stop, the pump is stopped.
The pump checks every 5 minutes (300 s) whether the volume flow demand is increasing
again. When the volume flow increases again, the pump continues running in its set control
mode in normal operation.
NOTICE
A volume flow increase relative to the set minimum volume flow "No-
Flow Stop Limit" is checked within a time interval of 10 s.
The reference volume flow Q
flow Q depending on the pump size.
Max
Field of application of No-Flow Stop:
a pump in a consumer circuit with control valves in heating or cooling (with radiators, fan
heaters, air-conditioning devices, underfloor heating/cooling, ceiling heating/cooling, con-
crete core heating/cooling) as an additional function for all control modes except Multi-
Flow Adaptation and volume flow Q-const.
NOTICE
This function is deactivated in the factory settings and must be activated
if required.
NOTICE
The additional control function "No-Flow Stop" is an energy-saving
function. Reducing unnecessary running times saves electrical pumping
energy.
NOTICE
The additional "No-Flow Stop" control function is available for suitable
applications only (see "Pre-defined applications in the setting assistant"
[} 179] section)! The additional control function "No-Flow Stop" cannot
be combined with the additional control function "Q-Limit
The additional control function "Q-Limit
(differential pressure control (∆p-v, ∆p-c), cumulated volume flow, temperature control
(∆T control, T control)). It makes it possible to limit the maximum volume flow to approx.
25 % – 90 %, depending on pump type. When the set value is reached, the pump is con-
trolled on the characteristic curve along the limit – never beyond.
NOTICE
When using Q-Limit
areas can be inadequately supplied and freeze!
Installation and operating instructions • Wilo-Stratos GIGA2.0-I, Wilo-Stratos GIGA2.0-D • Ed.02/2022-07
can be set between 10 % and 25 % of the maximum volume
ref
" can be combined with other control functions
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in non-hydraulically balanced systems, some
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"!
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