m
3
/h Distribution
Valve regulation
Frequency
converter control
% Hours
Power
Consump-
tion
Power
Consump-
tion
A
1
–B
1
[kWh]
A
1
–C
1
[kWh]
350
5
438
42.5
18.615
42.5
18.615
300
15
1314
38.5
50.589
29.0
38.106
250
20
1752
35.0
61.320
18.5
32.412
200
20
1752
31.5
55.188
11.5
20.148
150
20
1752
28.0
49.056
6.5
11.388
100
20
1752
23.0
40.296
3.5
6.132
Σ
100 8760
–
275.064
–
26.801
Table 4.2 Pump Performance
4.3 Control Examples
4.3.1 Improved Control
Using a frequency converter to control flow or pressure of
a system improves control.
A frequency converter can vary the speed of the fan or
pump, obtaining variable control of flow and pressure.
Furthermore, a frequency converter can quickly adapt the
speed of the fan or pump to new flow or pressure
conditions in the system.
Achieve simple control of process (flow, level, or pressure)
using the built-in PI control.
4.3.2 Smart Logic Control
A useful facility in the frequency converter is the smart
logic control (SLC).
In applications where a PLC generates a simple sequence,
the SLC can take over elementary tasks from the main
control.
SLC is designed to act from events sent to or generated in
the frequency converter. The frequency converter then
performs the pre-programmed action.
4.3.3 Smart Logic Control Programming
The smart logic control (SLC) comprises a sequence of
user-defined actions (see
parameter 13-52 SL Controller
Action
) executed by the SLC when the SLC evaluates the
associated user-defined event (see
parameter 13-51 SL
Controller Event
) as TRUE.
Events and actions are each numbered and are linked in
pairs called states. When event [1] is fulfilled (attains the
value TRUE), action [1] is executed. After this execution, the
conditions of event [2] is evaluated, and if evaluated TRUE,
action [2] is executed, and so on. Events and actions are
placed in array parameters.
Only 1 event is evaluated at any time. If an event is
evaluated as FALSE, nothing happens (in the SLC) during
the present scan interval and no other events are
evaluated. This means that when the SLC starts, it
evaluates event [1] (and only event [1]) each scan interval.
Only when event [1] is evaluated TRUE, the SLC executes
action [1] and starts evaluating event [2].
It is possible to program 0–20 events and actions. When
the last event/action has been executed, the sequence
starts over again from event [1]/action [1].
shows an example with 3 events/actions:
130BA062.14
State 1
13-51.0
13-52.0
State 2
13-51.1
13-52.1
Start
event P13-01
State 3
13-51.2
13-52.2
State 4
13-51.3
13-52.3
Stop
event P13-02
Stop
event P13-02
Stop
event P13-02
Illustration 4.11 Example with 3 Events/Actions
Application Examples
VLT
®
DriveMotor FCP 106/FCM 106
52
Danfoss A/S © 06/2016 All rights reserved.
MG03M202
4
4
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