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Siemens Building Technologies
Basic Documentation RVD230
CE1P2383en
HVAC Products
28 Function block Miscellaneous
27.05.2004
28
Function block Miscellaneous
28.1 Operating
lines
Line Function, parameter
Unit
Factory
setting
Range
181 Limitation function at contact H5
1
1 / 2
182 Limit value of the volumetric flow or power limitation
Imp/min
75
5…1500
183 Integral action time of the limitation function at contact H5
min
60
0…240
188 Locking time after the minimum limitation for the suppression of
hydraulic creep
min
6
--- / 1…20
189 Start of compensation (point of inflection), increase of the
reduced room temperature setpoint
°C
5
–50…+50
190 Slope, increase of the reduced room temperature setpoint
0
0…10
191 Forced charging at the beginning of release phase 1
1
0 / 1
192 Cooling down protection primary flow
min
---
--- / 3… 255
Function ”Forced charging at the beginning of release phase 1” on operating line 191 is
only possible with d.h.w. heating with a storage tank and is described there (refer to
section 17.1 "D.h.w. heating with storage tanks ")
Function ”
Cooling down protection primary flow”
on operating line 192 is only avail-
able with direct d.h.w. heating via heat exchanger and is described there (refer to sec-
tion 17.3 "Direct d.h.w. heating ").
28.2 Limitation function at contact H5
Input H5 at the RVD230 can be configured for the reception of energy and / or volumet-
ric flow pulses from heat meters (entry on operating line 55 must be 1). These pulses
activate a limit function in the controller.
The kind of limitation can be selected on operating line 181:
Setting Type
of
pulse
Function
1
Energy or volumetric flow
pulses
Maximum limitation with an adjustable limit
value
2
Energy and / or volumetric
flow pulses
Maximum limitation at a fixed value of
75 pulses/min (corresponding to 100% load)
The limit value is to be set on operating line 182. When the current number of pulses
reaches the set limit value or 100 % load, regulating unit Y1 (2-port valve in the primary
return) will be throttled. The action is always limited to the primary side of the plant.
To enhance the control performance, the integral action time of the limitation function
can be set on operating line 183. It applies to both the maximum limitation with an ad-
justable limit value and to that with a fixed value. The setting value determines the rate
at which the flow temperature setpoint will be reduced:
•
Short integral action times lead to faster reductions
•
Long integral action times lead to slower reductions
With this setting, the effect of the limitation function can be matched to the type of plant.
When, with setting 2, no more pulses are received during a period of 20 seconds, error
code 180 will be generated on operating line 50 (connection to heat meter disrupted)
because the minimum pulse rate is 5 pulses/min.
Note
