Upper Limit Of Output Range (Pmax); Mandatory Time On Basic Stage - Siemens RVA47.320 User Manual

Benefit
Description
Setting
Effect
Benefit
Description
Setting
Effect
Note
132/166
Siemens Building Technologies
HVAC Products
6.6

Upper limit of output range (Pmax)

•
The maximum output of the BMUs can be defined.
Defines the maximum limit of the optimum output range used by the BMUs.
1. Press the line selection buttons to select operating line 52OEM.
2. Press the + / - buttons to set the maximum limitation of the output.
Setting range
Pmin...100
Pmin. = minimum limit of output range (operating line 51)
The setting defines the maximum limit of the output range within which the BMUs are
controlled. The value is used as the switch-on or switch-off criterion according to the
selected running time strategy (refer to page 129).
Pmax
Pmin
2379Z06
The maximum limit of the output range (when <100 %) is crossed only when all
available BMUs run at Pmax and there is still demand for heat.
Otherwise, crossing only takes place in exceptional cases, e.g. when the setting of the
value is too low, or when, due to the BMUs output ratio, an invalid operational status
would result after changeover.
When using a setting of 100 %, the value will of course never be exceeded.
6.7

Mandatory time on basic stage

•
The minimum running time on the basic stage can be defined
This function allows the minimum running time on the basic stage to be set. This
enables the controller to operate smoothly even if BMUs of very high capacity are used.
1. Press the line selection buttons to select operating line 56OEM.
2. Press the + / - buttons to adjust the mandatory time on the basic stage.
Setting range
10...1200
When started up, each BMU is operated on the basic stage for the period of time
adjusted here. The BMU will be released for modulation only when this time has
elapsed. This period of time enables the controller to analyse the current operational
status and then plan the next steps.
When using heat generating equipment of very high capacity, the longer time leads to a
more stable (slower) operating performance.
Basic Documentation RVA47.320
Description of the OEM settings
Unit
%
Output range of BMUs
Unit
s
Factory setting
90
Factory setting
60
CE1P2379E
15.07.2002