5. Operation
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
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5.8 Parameter lists
5.8.1 C- parameters (Programming level)
Description
Range
Default
C1
C2
C3
C4
Setpoint 1 for controller block 1 - [P11]
Setpoint 2 for controller block 2 - [P12]
Setpoint 3 for controller block 3 - [P13]
Setpoint 4 for controller block 4 - [P14]
[C2 .. C4] werden ausgeblendet, wenn der entsprechende
Regelbaustein [P12 .. P14] deaktiviert ist.
-99°C .. +400°C
-99°C .. +400°C
-99°C .. +400°C
-99°C .. +400°C
15,0
15,0
15,0
15,0
C6
Alternative setpoint to C1
[C6] is visible only if set in [P18].
Example: if a heating system temperature is reduced at
night, a second alternative setpoint C6 is set. One of the
digital inputs [H21 .. H25] is used for switching.
-99°C .. +400°C
15,0
C7
Gap between “guide temperature and
successive temperature“
In the case of difference temperature control (customer-
specific version - not always present)
[C7] is visible only if automatic sensor recognition in [D60]
is enabled. If there is no second sensor connected, the
setpoint C1 is used for fixed-value setting.
IMPORTANT: If automatic sensor 2 recognition is enabled
in [D60] it is essential that difference temperature control
is configured in [P11] (setting 5..10, 17..22, 29..34).
-50 K .. +150 K
0,0
PID settings for control component
1 - [P11]
C10
C11
C12
C13
PID: Xp (P-part = proportional range)
PID: Tn (I-part = reset time)
PID: Tv (D-part = hold-back time)
PID: Tz (cycle time)
[C10 .. C13] are visible only if control component 1 - [P11]
is set to PID control.
[C13] is hidden in the case of analogue control..
0,1 K .. 99,9 K
0 s .. 999 s
0 s .. 999 s
1 s .. 999 s
10,0
0,0
0,0
5,0
PID settings for control component
2 - [P12]
C15
C16
C17
C18
PID: Xp (P- part = proportional range)
PID: Tn (I- part = reset time)
PID: Tv (D-part = hold-back time)
PID: Tz (cycle time)
[C15 .. C18] are visible only if control component [P12] is
set to PID control.
[C18] is hidden in the case of analogue control.
0,1 K .. 99,9 K
0 s .. 999 s
0 s .. 999 s
1 s .. 999 s
10,0
0,0
0,0
5,0
C20
C21
C22
C23
Value of hysteresis 1
Value of hysteresis 2
Value of hysteresis 3
Value of hysteresis 4
[C20 .. C23] are hidden if the relevant control component
(P11 .. P14) is not set to 2-point control or disabled.
0,1 K .. 99,9 K
0,1 K .. 99,9 K
0,1 K .. 99,9 K
0,1 K .. 99,9 K
0,05
0,05
0,05
0,5
* = further details see glossary
NB:
Full list of parameters.
Depending on control-
ler type and parameter
configuration, certain
parameters may be
hidden.
Setting parameters for a PID
control system is very com-
plex and requires a detailed
knowledge of control engi-
neering.
Incorrect parameter set-
tings may cause unde-
sirable malfunctions lea-
ding to damage to connec-
ted plant components.
If you have any questions
concerning parameter set-
tings, please contact Wel-
ba's technical department.
