Grundfos DID Montage- Und Betriebsanleitung Seite 24

9.6.2 Settings PID
C2 Settings
Type:
►
Kp [%]
Ti [s]
Td [s]
Stop on Error:
Max. 100%[s]:
Disturb.:
C2 Settings
Td [s]
►
Disturb.:
D. factor:
Direction:
Deadband:
Kp [%]
The proportional part of the PID controller with a
range of 0 to 100000 %
Ti [s]
The integral part of the PID controller with a range
of 1 to 10000 seconds.
Td [s]
The derivative part of the PID controller with a
range of 0 to 1000 seconds.
Stop on Error: If "Stop on Error: " is set to "Yes", the controller
stops, if a sensor error occurs. The status of the
controller changes to "Stopped".
Max. 100%[s]: Maximum dosing time with a controller output of
100 % (60-3600 s).
Disturb.:
Defines the source of the disturbance control.
D. factor:
The disturbance factor is a multiplicative factor
Direction:
Direction of the controller:
• "up": The controller increases the controller
output, if the setpoint is above the parameter,
and decreases the controller output, if the
setpoint is below the parameter.
• "down": The controller decreases the controller
output, if the setpoint is above the parameter,
and increases the controller output, if the
setpoint is below the parameter.
Deadband:
A dead band is defined to avoid repeated
activation-deactivation cycles (Hunting).
Output:
Heating
output
0
Target value
Fig. 10 Hunting (repeated activation-deactivation cycles)
24
Changing the controller type
1. Select "Type: " with the [Up] and [Down] buttons. Confirm
2. Select "PID", "2-P" or "none" with the [Up] and [Down]
PID
5.0
200.00
Changing the proportional part of the PID controller
0.00
1. Select "Kp [%]" with the [Up] and [Down] buttons. Confirm with
Yes
200
2. Change the proportional part value with the [Up], [Down],
DI 1
Changing the integral part of the PID controller
1. Select "Ti [s]" with the [Up] and [Down] buttons. Confirm with
0.00
2. Change the integral part value with the [Up], [Down], [Left]
DI 1
50.0
Disabling the integral part of the PID controller
up
1. Select "Ti [s]" with the [Up] and [Down] buttons. Confirm with
0.05
2. Press the [Function] button and confirm with [OK] again to
Changing the derivative part of the PID controller
1. Select "Td [s]" with the [Up] and [Down] buttons. Confirm with
2. Change the derivative part with the [Up], [Down], [Left] and
Disabling the derivative part of the PID controller
1. Select "Td [s]" with the [Up] and [Down] buttons. Confirm with
2. Press the [Function] button and confirm with [OK] again to
Changing the behaviour of the controller if an error occurs
1. Select "Stop on Error: " with the [Up] and [Down] buttons.
2. Select "Yes" or "No" with the [Up] and [Down] buttons.
Changing the maximum dosing time
1. Select "Max. 100%[s]: " with the [Up] and [Down] buttons.
2. Change the maximum dosing time with the [Up], [Down], [Left]
Disturbance control
Deadband:
The function of disturbance control (compound-loop control) is
defined by following equation:
Controller output value with disturbance control = controller
output value * Source value * "D. factor: ".
Example:
•
•
Cooling
•
output
PV
The new controller output is:
Controller output value with disturbance control = 50 [%] * 1.2
[mA] * 0.5 [1/mA] = 30 [%]
Assigning the disturbance control to an input (parameter)
1. Select "Disturb.: " with the [Up] and [Down] buttons. Confirm
2. Change the input for disturbance control with the [Up] and
Changing the disturbance factor
1. Select "D. factor: " with the [Up] and [Down] buttons. Confirm
2. Change the disturbance factor with the [Up], [Down], [Left]
with [OK].
buttons. Confirm with [OK].
– "none" deactivates the controller.
[OK].
[Left] and [Right] buttons. Confirm with [OK].
[OK].
and [Right] buttons. Confirm with [OK].
[OK].
disable "Ti [s]".
– The displayed value is "++++++.++".
[OK].
[Right] buttons. Confirm with [OK].
[OK].
disable "Td [s]".
– The displayed value is "0.00".
Confirm with [OK].
Confirm with [OK].
Confirm with [OK].
and [Right] buttons. Confirm with [OK].
The controller output value is 50 %
The source is the analog input with 1.2 mA
The disturbance factor is 0.5
with [OK].
[Down] buttons. Confirm with [OK].
with [OK].
and [Right] buttons. Confirm with [OK].