VLT
®
8000 AQUA
Programming
Function:
Select the function which is to be activated
when the frequency converter is exposed to
an overtemperature condition.
Description of choice:
At
Trip
[0] the frequency converter will stop the
motor and export an alarm.
At
Autoderate & warning
[1] the frequency converter will
first reduce the switching frequency to minimize internal
losses. If the overtemperature condition persists, the
frequency converter will reduce the output current
until the heat sink temperature stabilizes. When the
function is active, a warning will be exported.
412 Trip delay overcurrent, I
LIM
()
(OVERLOAD DELAY)
Value:
0 - 60 sec. (61=OFF)
✭
61 sec. (OFF)
Function:
When the frequency converter registers that the output
current has reached the current limit I
LIM
(parameter
215
Current limit
) and stays there for the duration
selected, a cut-out will be performed.
Description of choice:
Select for how long the frequency converter is to
be able to keep up with the output current at the
current limit I
LIM
before it cuts out.
In OFF mode, parameter 412
Trip delay overcurrent,
I
LIM
is inactive, i.e. cut-outs are not performed.
■
Feedback signals in open loop
Normally, feedback signals and thus feedback
parameters are only used in
Closed loop operation
;
in VLT 8000 AQUA units, however, the feedback
parameters are also active in
Open loop
operation.
In
Open loop mode
, the feedback parameters can
be used to show a process value in the display.
If the present temperature is to be displayed, the
temperature range can be scaled in parameters
413/414
Minimum/Maximum feedback
, and the unit
(°C, °F) in parameter 415
Process units
.
413 Minimum feedback , FB
MIN
(MIN. FEEDBACK)
Value:
-999,999.999 - FB
MAX
✭
0.000
Function:
Parameters 413
Minimum feedback, FB
MIN
and
414
Maximum feedback, FB
MAX
are used to
scale the display indication, thereby ensuring that
it shows the feedback signal in a process unit
proportionally to the signal at the input.
Description of choice:
Set the value to be shown on the display at minimum
feedback signal value (par. 309, 312, 315
Min
.
scaling) on the selected feedback input (parameters
308/311/314
Analog inputs
).
414 Maximum feedback, FB
MAX
(MAX. FEEDBACK)
Value:
FB
MIN
- 999,999.999
✭
100.000
Function:
See the description of par. 413
Minimum
feedback, FB
MIN
.
Description of choice:
Set the value to be shown on the display when
maximum feedback (par. 310, 313, 316
Max. scaling
)
has been achieved at the selected feedback input
(parameters 308/311/314
Analoge inputs
).
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
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