7.2 Temperature controller
From factory MIXIT is configured so that the temperature response
of the system in most cases corresponds to the centre graph in the
figure. This is the ideal response, however, in some cases it maybe
necessary to adjust it.
0
500
1000
1500
0
0.5
1
1.5
Kp = 2
0
500
1000
1500
0
0.5
1
1.5
0
500
1000
1500
0
0.5
1
1.5
0
500
1000
1500
0
0.5
1
1.5
Kp = 1
0
500
1000
1500
0
0.5
1
1.5
0
500
1000
1500
0
0.5
1
1.5
0
500
1000
1500
Ti = 50
0
0.5
1
1.5
Kp = 0.5
0
500
1000
1500
Ti = 100
0
0.5
1
1.5
0
500
1000
1500
Ti = 200
0
0.5
1
1.5
TM077581
Typical responses to a step input for PI controlled systems such as MIXIT
By increasing the proportional gain (Kp) of the controller, as shown
in the top row in the figure, the response rises more rapidly. If the
gain is too high, undamped oscillations occur. If the gain
is even higher, the oscillation of the temperature will continue,
causing instability. By decreasing the proportional gain of the
controller, as shown in the bottom row in the figure, the response
becomes slower.
By increasing the integral time (Ti), as shown in the right column in
the figure, the response takes longer time to reach the setpoint.
Decreasing the integral time has the opposite effect, which is shown
in the left column in the figure.
This function can only be adjusted via Grundfos GO Remote.
7.2.1 Setting the temperature controller
Grundfos GO Remote menu:
Main menu
>
Settings
>
Application settings
>
Temperature
controller
The gain (Kp) and integral time (Ti) are preset from factory.
However, if the factory setting is not the optimum setting, you can
change the gain and integral time.
1.
Set the gain (Kp) within the range from 0.1 to 20.
2.
Set the integral time (Ti) within the range from 10 to 3600
seconds.
7.3 Underfloor overheat protection
This function is only available if the application setting is set to
underfloor heating.
By defining a maximum forward flow temperature, you ensure that
the temperature will never exceed the given value, thus protecting
the floor from overheating.
The setpoint can be set to a maximum of 5 °C below the set
maximum forward-flow temperature.
7.3.1 Setting the underfloor overheat protection
The function can be active only for underfloor heating application.
1.
Enable the function by setting BO,3 to 1. When enabled, the
valve is closed.
2.
The function is configured via Grundfos GO Remote:
Main menu
>
Settings
>
Application settings
>
Floor
overheat protection
.
a. Activate the function by pressing the grey slide-button in the
top right corner of the screen.
b. Press
Max. flow temperature
to define a maximum
forward-flow temperature. The temperature in the system
will never exceed the given value. The setpoint can be set to
a maximum of 5 °C below the set maximum forward-flow
temperature.
Actual status is read via BI,6.
if the flow temperature is above the configured value, the MIXIT unit
gives a notification by setting BI,6 to 1.
D
Object name R/W
Description
BO,3
Simulate
Overheat
Protection
W
0: Disable overheat protection
(default)
1: Enable overheat protection
BI,6
Notification
Flow Temp
High
R
0: Not detected
1: Detected.
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