Smart Logic Control (Slc); Safe Torque Off - Danfoss VLT AutomationDrive FC 301 Design Manual

Product Features

4.2.14 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 Illustration 4.4.
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..
. . .
. . .
Illustration 4.4 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 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].
Illustration 4.5 shows an example with 4 event/actions:
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
Par. 13-52
Illustration 4.5 Order of Execution when 4 Events/Actions are
SL Controller Action
Programmed
Coast
Start timer
Set Do X low
Comparators
Select set-up 2
Comparators are used for comparing continuous variables
. . .
(i.e. output frequency, output current, analog input etc.) to
fixed preset values.
Illustration 4.6 Comparators
Logic Rules
Combine up to 3 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 4.7 Logic Rules

4.2.15 Safe Torque Off

For information about Safe Torque Off, refer to the VLT
Series Safe Torque Off Operating Instructions.
MG33BF02 - Rev. 2013-12-20
Start
event P13-01
State 1
13-51.0
13-52.0
Stop
event P13-02
State 4
13-51.3
13-52.3
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
13-51.1
13-52.1
Stop
event P13-02
State 3
13-51.2
13-52.2
Par. 13-43
Logic Rule Operator 2
. . .
. . .
®
FC
43
4 4