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308
Terminal 53, analog input voltage
(AI [V ] 53 FUNCT.)
Function:
This parameter allows a choice of the desired option
on terminal 53.
Scaling of the input signal is effected in parameters
309 and 310.
Description of choice:
No operation.
Is selected if the adjustable frequency
drive is not to react to signals connected to the termi-
nal.
Reference. Is selected to enable change of reference
by means of an analog reference signal.
If other inputs are connected, these are added up, tak-
ing account of their signs.
Feedback signal. Is selected if closed-loop control with
an analog signal is used.
Torque limit. Is used if the torque limit value set in pa-
rameter 221 is to be changed by means of an analog
signal.
Thermistor. Is selected if a motor-integrated thermistor
(according to DIN44080/81) should stop the adjusta-
ble frequency drive in case of motor overtemperature.
The cut-out value is > 3 k
. The thermistor is connec-
ted to terminal 50 and the actual input selected (53 or
54).
NOTE
If the temperature of the motor is utilized
through a thermistor via the adjustable
frequency drive, the following most be no-
ted:
If there are short circuits between the mo-
tor winding and the thermistor, PELV is
not complied with. In order to comply with
PELV, the thermistor must be utilized ex-
ternally.
If a motor features a thermal switch instead, this can
also be connected to the input. If motors run in parallel,
the thermistors/thermal switches can be connected in
series (total resistance < 3 k
). Parameter 128 must
be programmed for
Thermistor warning
[1] or
Thermis-
tor trip
[2].
Relative reference is selected if a relative adjustment
of the reference sum is required.
This function is only active if
Relative
has been selected
(parameter 214). The relative reference on terminal
54/60 is a percentage of the full range of the terminal
in question. This will be added to the sum of the other
references. If several relative references have been
selected (preset reference 215-218, 311 and 314),
these will be added first, following which this sum will
be added to the sum of the active references.
NOTE
If
Reference
or
Feedback
signal has been
selected on more than one terminal, these
signals will be added with signs.
Max. torque frequency
. This is only used in
Torque
control, open-loop
(parameter 100) for limiting the out-
put frequency. Selected if the max. output frequency
is to be controlled by an analog input signal. The fre-
quency range goes from
Output frequency low limit
(parameter 201) to
Output frequency high limit
(param-
eter 202).
309
Terminal 53, min. scaling
(AI 53 SCALE LOW)
Value:
0.0 - 10.0 Volt
0.0 Volt
VLT
®
5000 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
114
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
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Страница 196: ...RELATIVE VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 193 List of functions ...
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