English (GB)
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12.8 Signal relays (Relay outputs)
The pump incorporates one signal relay for
potential-free signalling
Function
You can configure the signal relay to be activated by
one of the following incidents:
•
Not active.
•
Ready.
The pump can be running or is ready to run and
no alarms are present.
•
Alarm.
There is an active alarm and the pump is
stopped.
•
"Operating" (Operation).
"Operating" equals "Running" but the pump is still
in operation when the pump is stopped due to low
flow rate. See section
on
page
.
•
"Running" (Pump running).
The pump is running.
•
Warning.
There is an active warning.
•
"Controller" (Controller settings)
The pumps have a factory default setting of gain (K
p
)
and integral time (T
i
).
However, if the factory setting is not the optimum
setting, you can change the gain and the integral
time:
•
Set the gain within the range from 0.1 to 20.
•
Set the integral-action time within the range from
0.1 to 3600 seconds.
If you select 3600 seconds, the controller
functions as a PI controller.
Furthermore, you can set the controller to inverse
control.
This means that if you increase the setpoint, the
speed is reduced. In the case of inverse control, you
must set the gain within the range from -0.1 to -20.
Guidelines for setting of PI controller
The tables below show the recommended controller
settings:
1)
In heating systems, an increase in pump
performance results in a rise in temperature at
the sensor.
2)
In cooling systems, an increase in pump
performance results in a drop in temperature at
the sensor.
L2: distance in metres between heat exchanger and
sensor.
General rules of thumb
If the controller is too slow-reacting, increase the
gain.
If the controller is hunting or unstable, dampen the
system by reducing the gain or increasing the
integral time.
Constant
temperature
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5
-0.5
10 + 5L2
0.5
-0.5
30 + 5L2
Constant pressure
K
p
T
i
0.5
0.5
0.5
0.5
L2
t
L2
t
p
p
