Relay Outputs; Analog Output; Controller Settings - Grundfos TPE Installation And Operating Instructions Manual

10.9 Relay outputs

Function (terminal)
Relay output 1 (NC, C1, NO)
Relay output 2 (NC, C2, NO)
The pump incorporates two signal relays for potential-free
signalling. See section
17. Signal relays
The signal relays can be configured to be activated by one of the
following incidents:
Ready
•
Operation
•
Alarm
•
Warning
•
Limit 1 exceeded
•
Limit 2 exceeded
•
Pump running
•
Control of external fan
•
Not active.
•

10.10 Analog output

Whether the analog output is available or not, depends on the
functional module fitted in the pump:
Function (terminal)
Analog output
To set up the analog output, make the settings below.
Output signal
0-10 V
•
0-20 mA
•
4-20 mA.
•
Function of analog output
Actual speed
•
Actual value
•
Resulting setpoint
•
Motor load
•
Motor current
•
Limit 1 exceeded
•
Limit 2 exceeded
•
Flow rate.
•
26
FM 200 FM 300
(standard) (advanced)
● ●
● ●
for further information.
FM 200 FM 300
(standard) (advanced)
- ●

10.11 Controller settings

The pumps have a factory default setting of gain (K
time (T ).
i
However, if the factory setting is not the optimum setting, the gain
and the integral time can be changed:
• Set the gain (K ) within the range from 0.1 to 20.
p
• Set the integral-action time (T
3600 s.
If 3600 s is selected, the controller will function as a P
controller.
Furthermore, the controller can be set to inverse control.
This means that if the setpoint is increased, the speed will be
reduced. In the case of inverse control, the gain (K
within the range from -0.1 to -20.
Guidelines for setting of PI controller
The tables below show the recommended controller settings:
Differential-pressure
control
p
p
p p
L1
L1
L1 = Distance [m] between pump and sensor.
Temperature control
Heating
system
0.5
t
L2
L2
t
0.5
1)
In heating systems, an increase in pump performance will
result in a rise in temperature at the sensor.
2)
In cooling systems, an increase in pump performance will
result in a drop in temperature at the sensor.
L2 = Distance [m] between heat exchanger and sensor.
) and integral
p
) within the range from 0.1 to
i
) must be set
p
K T
p i
0.5 0.5
L1 < 5 m: 0.5
0.5 L1 > 5 m: 3
L1 > 10 m: 5
K
p
T
Cooling i
1) 2)
system
-0.5 10 + 5L2
-0.5 30 + 5L2