Smart Logic Control (Slc) - Danfoss VLT AQUA Drive FC 202 Design Manual

Product Overview
ensures that the system or auxiliary equipment is in the
2 2
proper state before the drive is allowed to start the motor.

2.6.15 Smart Logic Control (SLC)

Smart logic control (SLC) is 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 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 leads to an associated action as
shown in Figure 2.19.
Par. 13-51
SL Controller Event
Running
Warning
Torque limit
Digital input X 30/2
. . .
Par. 13-43
Logic Rule Operator 2
. . .
. . .
Par. 13-11
Comparator Operator
=
TRUE longer than..
. . .
. . .
Figure 2.19 SCL Event and Action
Events and actions are each numbered and linked 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] is evaluated and if evaluated TRUE,
action [1] is executed and so on. Only one event is
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 are 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, the SLC executes action [0] and starts evaluating
event [1]. It is possible to program from 1 to 20 events and
actions.
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VLT AQUA Drive FC 202
When the last event/action has been executed, the
sequence starts over again from event [0]/action [0].
Figure 2.20 shows an example with four event/actions:
Par. 13-52
SL Controller Action
Coast
Figure 2.20 Order of Execution when Four Events/Actions are
Start timer
Programmed
Set Do X low
Select set-up 2
. . .
Comparators
Comparators are used for comparing continuous variables
(output frequency, output current, analog input etc.) to
fixed preset values.
Figure 2.21 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
Figure 2.22 Logic Rules
Danfoss A/S © 09/2014 All rights reserved.
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
Par. 13-43
Logic Rule Operator 2
. . .
. . .
MG20N622