Limitation Using 0/4 To 20 Ma Signal; Creep Feed Rate Limitation Using A Binary Input - Samson TROVIS 5579 Mounting And Operating Instructions

7.11.2 Limitation using 0/4 to 20 mA signal

Depending on the operating situation, a heat meter at input WMZ/Bed (terminals 17/19)
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 set in unit [m
played in 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.
Functions
Flow rate limitation (capacity limi-
tation) in Rk1 with pulses at input
WMZ
Flow rate limitation in Rk1 using
0/4 to 20 mA at input WMZ
Flow rate limitation in Rk1 using
the meter bus

7.11.3 Creep feed rate limitation using a binary input

It is possible to report to the controller when the creep feed rate has fallen below a certain
level by using a limit switch of the primary valve connected to the input BE13. Either the open
(bE=0) binary input or the closed binary input (bE=1) can be assigned to inform about the
creep feed rate status. Shortly after the alert, the controller closes the valve Rk1. As soon as
the flow temperature falls below the set point by more than 5 °C after the valve has been
closed, control operation is started again.
3 /h]. The current flow rate in [m
WE Configuration
0 CO5 -> F10 - 0
0 CO5 -> F11 - 1
0 Lower measuring range value / 0, 4 mA
1.5 m 3 Upper meas. range value 20 mA / 0.01 to 650
h
1.5 m 3 Max. limit value / 0.01 to 650
h
1.5 3 Max. limit value for heating* / 0.01 to 650
m
h
1.5 3 Max. limit value for DHW* / 0.01 to 650
m
h
1.0 Limiting factor / 0.1 to 10.0
0 CO6 -> F11 - 0
* Not in Anl 1.0, 1.5, 1.6, 3.0, 3.5, 4.0, 7.x, 10.x, 11.x,
12.x, 13.x, 21.x and 25.0
System-wide functions
3 /h] is dis-
m 3
h
m 3
h
3
m
h
3
m
h
103
EB 5579 EN