6.1.5. Smart Logic Control
The Smart Logic Control (SLC) is essentially a sequence of user defined actions (see par. 13-52)
executed by the SLC when the associated user defined
event
(see par. 13-51) is evaluated as
TRUE by the SLC.
Events
and
actions
are each numbered and are linked in pairs called states. This means that when
event [1]
is fulfilled (attains the value TRUE),
action [1]
is executed. After this, the conditions
of
event [2]
will be evaluated and if evaluated TRUE,
action [2]
will be executed and so on. Events
and actions are placed in array parameters.
Only one
event
will be evaluated at any time. If an
event
is evaluated as FALSE, nothing happens
(in the SLC) during the present scan interval and no other
events
will be evaluated. This means
that when the SLC starts, it evaluates
event [1]
(and only
event [1]
) each scan interval. Only when
event [1]
is evaluated TRUE, the SLC executes
action [1]
and starts evaluating
event [2]
.
It is possible to program from 0 to 20
events
and
actions
. When the last
event / action
has
been executed, the sequence starts over
again from
event [1] / action [1]
. The illustra-
tion shows an example with three
events /
actions
:
6.1.6. Smart Logic Control Programming
New useful facility in VLT HVAC Drive is the Smart Logic Control (SLC).
In applications where a PLC is generating a simple sequence the SLC may take over elementary
tasks from the main control.
SLC is designed to act from event send to or generated in the VLT HVAC Drive . The frequency
converter will then perform the pre-programmed action.
VLT
®
HVAC Drive Design Guide
6. Application Examples
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
113
6
Содержание VLT series
Страница 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...
Страница 120: ...7 RS 485 Installation and Set up VLT HVAC Drive Design Guide 120 MG 11 B2 02 VLT is a registered Danfoss trademark 7...
Страница 152: ...8 Troubleshooting VLT HVAC Drive Design Guide 152 MG 11 B2 02 VLT is a registered Danfoss trademark 8...