Smart Logic Controller; Extreme Running Conditions - Danfoss VLT AutomationDrive FC 360 Design Manual

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2.10 Smart Logic Controller

Smart logic control (SLC) is a sequence of user-defined
2 2
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 2.36.
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 2.36 Associated 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] are 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. 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 2.37 shows an example with 3 event/actions:
44
Design Guide
Par. 13-52
SL Controller Action
Illustration 2.37 Sequence with 3 Event/Actions
Coast
Start timer
Comparators
Set Do X low
Comparators are used for comparing continuous variables
Select set-up 2
. . .
(i.e. output frequency, output current, analog input etc.) to
fixed preset values.
Illustration 2.38 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 2.39 Logic Rules

2.11 Extreme Running Conditions

Short circuit (motor phase – phase)
The frequency converter is protected against short circuits
by means of current measurement in each of the 3 motor
phases or in the DC link. A short circuit between 2 output
phases causes an overcurrent in the frequency converter.
The frequency converter is turned off individually when
the short circuit current exceeds the permitted value
(Alarm 16 Trip Lock).
Danfoss A/S © 09/2014 All rights reserved.
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
. . .
. . .
MG06B402