Smart Logic Controller - Danfoss VLT AutomationDrive FC 300 Design Manual

Introduction

3.10 Smart Logic Controller

Smart Logic Control (SLC) is essentially a sequence of user
defined actions (see 13-52 SL Controller Action [x]) executed
by the SLC when the associated user defined event (see
13-51 SL Controller Event [x]) is evaluated as TRUE by the
3 3
SLC.
The condition for an event can be a particular status or
that the output from a Logic Rule or a Comparator
Operand becomes TRUE. That will lead to an associated
Action as illustrated.
Par. 13-51
SL Controller Event
Running
Warning
Torque limit
Digital inpute X 30/2
. . .
Par. 13-43
Logic Rule Operator 2
. . .
. . .
Par. 13-43
Comparator Operator
=
TRUE longer than..
. . .
. . .
Illustration 3.35 Current Control Status/Event and Action
Events and actions are each numbered and linked together
in pairs (states). This means that when event [0] is fulfilled
(attains the value TRUE), action [0] is executed. After this,
the conditions of event [1] will be evaluated and if
evaluated TRUE, action [1] will be executed and so on.
Only one event will be evaluated at any time. If an event is
evaluated as FALSE, nothing happens (in the SLC) during
the current scan interval and no other events will be
evaluated. This means that when the SLC starts, it
evaluates event [0] (and only event [0]) each scan interval.
Only when event [0] is evaluated TRUE, will the SLC
execute action [0] and start evaluating event [1]. It is
possible to programme from 1 to 20 events and actions.
When the last event/action has been executed, the
sequence starts over again from event [0]/action [0]. The
illustration shows an example with three event/actions:
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Illustration 3.36 Example - Internal Current Control
Par. 13-51
SL Controller Action
Comparators
Coast
Start timer
Comparators are used for comparing continuous variables
Set Do X low
(i.e. output frequency, output current, analog input etc.) to
Select set-up 2
. . .
fixed preset values.
Illustration 3.37 Comparators
Logic Rules
Combine up to three boolean inputs (TRUE/FALSE inputs)
from timers, comparators, digital inputs, status bits and
events using the logical operators AND, OR, and NOT.
Par. 13-40
Logic Rule Boolean 1
Par. 13-42
Logic Rule Boolean 2
Illustration 3.38 Logic Rules
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Start
event P13-01
State 1
Event 1/
Action 1
Stop
event P13-02
State 4
Event 4/
Action 4
Stop
event P13-02
Par. 13-11
Comparator Operator
Par. 13-10
Comparator Operand
=
TRUE longer than.
Par. 13-12
Comparator Value . . .
. . .
Par. 13-41
Logic Rule Operator 1
. . .
. . .
Par. 13-44
Logic Rule Boolean 3
State 2
Event 2/
Action 2
Stop
event P13-02
State 3
Event 3/
Action 3
Par. 13-43
Logic Rule Operator 2
. . .
. . .