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event
(see
13-51 SL Controller Event
) 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
figure shows an example with three
events / actions
:
Figure 6.4
6.1.7 SLC Application Example
One sequence 1:
Start – ramp-up – run at reference speed 2 sec – ramp-down and hold shaft until stop.
Figure 6.5
Set the ramping times in
3-41 Ramp 1 Ramp Up Time
and
3-42 Ramp 1 Ramp Down Time
to the desired times
tramp =
tacc × nnorm (par. 1 − 25)
ref RPM
Set term 27 to
No Operation
(
5-12 Terminal 27 Digital Input
)
Application Examples
VLT
®
HVAC Drive Design Guide
MG11BB22 - VLT
®
is a registered Danfoss trademark
6-3
6
6
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