Control Examples; Improved Control; Smart Logic Control; Smart Logic Control Programming - Danfoss VLT DriveMotor FCP 106 Design Manual

Application Examples
/h Distribution
3
m
% Hours
350 5 438
300 15 1314
250 20 1752
4 4
200 20 1752
150 20 1752
100 20 1752
Σ
100 8760
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.
52
®
VLT
Valve regulation Frequency
converter control
Power Consump- Power Consump-
tion
A –B [kWh] A –C
1 1 1 1
42.5 18.615 42.5
38.5 50.589 29.0
35.0 61.320 18.5
31.5 55.188 11.5
28.0 49.056 6.5
23.0 40.296 3.5
– 275.064 –
Danfoss A/S © 06/2016 All rights reserved.
DriveMotor FCP 106/FCM 106

4.3.3 Smart Logic Control Programming

The smart logic control (SLC) comprises a sequence of
tion
user-defined actions (see parameter 13-52 SL Controller
[kWh] Action) executed by the SLC when the SLC evaluates the
associated user-defined event (see parameter 13-51 SL
18.615
Controller Event) as TRUE.
38.106
Events and actions are each numbered and are linked in
32.412
pairs called states. When event [1] is fulfilled (attains the
20.148
value TRUE), action [1] is executed. After this execution, the
11.388
conditions of event [2] is evaluated, and if evaluated TRUE,
6.132
action [2] is executed, and so on. Events and actions are
26.801
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]. Illustration 4.11
shows an example with 3 events/actions:
Start
event P13-01
Stop
event P13-02
State 4
13-51.3
13-52.3
Illustration 4.11 Example with 3 Events/Actions
State 1
13-51.0
13-52.0
State 2
13-51.1
13-52.1
State 3
13-51.2
13-52.2
Stop
event P13-02
Stop
event P13-02
MG03M202