102
MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
Typical thermistor characteristics
Thermistor: Selected if a motor’s possible
built-in thermistor is to be able to stop the
frequency converter if the motor overheats.
The cut-out value is
≥
3 k
Ω
. The thermistor
is connected between terminal 50 (+10 V)
and terminal 16 (see p. 37). When the
thermistor’s resistance exceeds 3 k
Ω
, the
frequency converter will cut out with the
following display:
If a motor instead of the thermistor is
equipped with a Klixon thermal contact,
this can also be used on this input. On
operation of parallel-coupled motors, the
thermistors can be connected in series, the
number depending on the thermistor’s
ohmic value in heated operating status.
NB:
If a thermistor is selected in parameter
400 without being connected, the frequen-
cy converter goes into ALARM mode. To
come out of this status, the stop/reset
button must to be kept down while the data
value is changed using the +/- keys.
400
Binary input 16
(Input 16)
(Continued)
Parameter description
4.. Inputs and outputs
Value:
Reset (reset)
[0]
Stop (stop)
[1]
✭
Freeze reference (freeze ref.)
[2]
Select setup (setup selection)
[3]
Pulse input 100 Hz
(pulses 100 Hz)
[4]
Pulse input 1 kHz
(pulses 1 kHz)
[5]
Pulse input 10 kHz
(pulses 10 kHz)
[6]
401
Binary input 17
(Input 17)
Function:
Used to select between different function
options for terminal 17.
Description of choices:
Reset, stop, freeze ref. and select setup as
for terminal 16.
Pulses: Terminal 17 can be used for puls-
ing signals in the ranges: 0-100 Hz, 0-1
kHz and 0-10 kHz (see also data
p.
31).
The pulsing signal can be used as a speed
reference for ordinary operation and as
either set-point or feedback signal on
operation in “closed loop” (PID regulator),
also see parameter 101. Pulse generators
with PNP signal can be used between
terminals 12 and 17.
NB: Frequencies higher than about 1 kHz
require pulse generators with a push-pull
output.
ALARM
TRIP
MOTOR TRIP
✮
= Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
