Example to determine the limit value:
If a capacity of 30 kW is to be limited, the following limit value must be set for a heat meter
with an output of one pulse per kilowatt-hour:
P
==
30 kW
1kWh/pulse
30 pulse / h
Note!
If CO5 -> F00 - 1 is indicated, access to the return flow, flow rate and heat capacity settings
are locked.
Functions
WE Configuration
Flow rate limitation (capacity limi
-
tation) in Rk1 with pulses at input
WMZ
0
15
pulse
h
15
pulse
h
15
pulse
h
1.0
CO5 -> F10 - 1
Max. limit value/ 3 to 500
pulse
h
Max. limit value heating* / 3 to 500
pulse
h
Max. limit value DHW* / 3 to 500
pulse
h
Limiting factor / 0.1 to 10.0
Flow rate limitation in Rk1 with
0/4 to 20 mA at input WMZ
0 CO5 -> F11 - 0
* Not in Anl 1.0, 1.5, 1.6, 3.0, 3.5, 4.0 and 11.x
7.10.2 Limitation using 0/4 to 20 mA signal
Depending on the operating situation, a heat meter at input WMZ/Bed (terminals 03/13)
with a 0/4 to 20 mA output (connected in parallel to input WMZ/Bed using 50 Ω) can be
used to limit the flow rate in the system. All limit values are given in the unit “cubic meters
per hour“ [m
3
/h]. As a result, both a
Lower measuring range value
0 or 4 mA and an
Up
-
per measuring range value
must be adjusted in unit [m
3
/h]. The current flow rate in [m
3
/h]
is displayed in the extended operating level (–> key number 1999).
When the flow rate reaches the current
Max. limit value
, the flow set point of control circuit
Rk1 is reduced. How strongly the controller responds is determined by the
Limiting factor
.
Note!
If CO5 -> F00 - 1 is indicated, access to the return flow, flow rate and heat capacity settings
are locked.
EB 5575 EN 81
System-wide functions
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