Analogue Inputs - Danfoss VLT 7000 Series Manual

Analogue inputs

Two analogue inputs for voltage signals (terminals
53 and 54) are provided for reference and feedback
signals. Furthermore, an analogue input is available
for current signal (terminal 60). A thermistor can
be connected to voltage input 53 or 54.
The two analogue voltage inputs can be scaled
in the range of 0-10 V DC; the current input
in the range of 0-20 mA.
Analogue inputs
Value:
No operation
Reference
Feedback
Thermistor
308 Terminal 53, analogue input voltage
(AI [V] 53 FUNCT.)
Function:
This parameter is used to select the required
function to be linked to terminal 53.
Description of choice:
No operation. Is selected if the frequency converter
is not to react to signals connected to the terminal.
Reference. Is selected to enable change of reference
by means of an analogue reference signal.
If reference signals are connected to several inputs,
these reference signals must be added up.
Feedback. If a feedback signal in connected,
there is a choice of a voltage input (terminal 53 or
54) or a current input (terminal 60) as feedback.
In the case of zone regulation, feedback signals
must be selected as voltage inputs (terminals 53
and 54). See Feedback handling.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.70.A1.02 - VLT is a registered Danfoss trademark
terminal no.
parameter
(NO OPERATION)
(REFERENCE)
(FEEDBACK)
(THERMISTOR)
VLT® 7000 Booster
The table below gives the possibilities for programming
the analogue inputs. Parameter 317 Time out and
318 Function after time out allow activation of a
time-out function on all analogue inputs. If the signal
value of the reference or feedback signal connected
to one of the analogue input terminals drops to
below 50% of the minimum scaling, a function
will be activated after the time out determined in
parameter 318, Function after time out.
53(voltage) 54(voltage)
308 311
[0] [0]
[1] [1]
[2] [2]
[3] [3]
Thermistor. Is selected if a thermistor integrated
in the motor is to be able to stop the frequency
converter in case of motor overtemperature.
The cut-out value is 3 kohm.
If a motor features a Klixon 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
kohm). Parameter 117 Motor thermal protection
must be programmed for Thermal warning [1] or
Thermistor trip [2], and the thermistor must be
inserted between terminal 53 or 54 (analogue voltage
input) and terminal 50 (+10 V supply).
60(current)
314
[0]
[1]
[2]
69