2.10 Smart Logic Controller
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
. . .
. . .
Par. 13-11
Comparator Operator
Par. 13-43
Logic Rule Operator 2
Par. 13-51
SL Controller Event
Par. 13-52
SL Controller Action
130BB671.13
Coast
Start timer
Set Do X low
Select set-up 2
. . .
Running
Warning
Torque limit
Digital input X 30/2
. . .
=
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].
shows an example with 3 event/actions:
130BA062.14
State 1
13-51.0
13-52.0
State 2
13-51.1
13-52.1
Start
event P13-01
State 3
13-51.2
13-52.2
State 4
13-51.3
13-52.3
Stop
event P13-02
Stop
event P13-02
Stop
event P13-02
Illustration 2.37 Sequence with 3 Event/Actions
Comparators
Comparators are used for comparing continuous variables
(i.e. output frequency, output current, analog input etc.) to
fixed preset values.
Par. 13-11
Comparator Operator
=
TRUE longer than.
. . .
. . .
Par. 13-10
Comparator Operand
Par. 13-12
Comparator Value
130BB672.10
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. 13-43
Logic Rule Operator 2
Par. 13-41
Logic Rule Operator 1
Par. 13-40
Logic Rule Boolean 1
Par. 13-42
Logic Rule Boolean 2
Par. 13-44
Logic Rule Boolean 3
130BB673.10
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).
Product Overview
Design Guide
44
Danfoss A/S © 09/2014 All rights reserved.
MG06B402
2
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