Grundfos TPE - Control Settings and Outputs; Controller Tuning and Relay Outputs

English (GB)
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10.9 Relay outputs
The pump incorporates two signal relays for potential-free
signalling. See section 17. Signal relays for further information.
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:
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.
10.11 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, the gain
and the integral time can be changed:
• Set the gain (K
p
) within the range from 0.1 to 20.
• Set the integral-action time (T
i
) within the range from 0.1 to
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
p
) must be set
within the range from -0.1 to -20.
Guidelines for setting of PI controller
The tables below show the recommended controller settings:
L1 = Distance [m] between pump and sensor.
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.
Function (terminal)
FM 200
(standard)
FM 300
(advanced)
Relay output 1 (NC, C1, NO) ●●
Relay output 2 (NC, C2, NO) ●●
Function (terminal)
FM 200
(standard)
FM 300
(advanced)
Analog output - ●
Differential-pressure
control
K
p
T
i
0.5 0.5
0.5
L1 < 5 m: 0.5
L1 > 5 m: 3
L1 > 10 m: 5
Temperature control
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5 -0.5 10 + 5L2
0.5 -0.5 30 + 5L2
p
p
p
p
ǻS
L1
L1
ǻS
L2
t
L2
t