Danfoss FC 300 Programming Manual page 46

Parameter Descriptions
1-93 Thermistor Source
Option:
3 3
[0] None
*
[1] Analog input 53
[2] Analog input 54
[3] Digital input 18
[4] Digital input 19
[5] Digital input 32
[6] Digital input 33
NOTE
This parameter cannot be adjusted while the motor is
running.
NOTE
Digital input should be set to [0] PNP - Active at 24V in
par. 5-00.
3.3.11 KTY Sensor Connection
(FC 302 only)
KTY sensors are used especially in Permanent Magnet Servo
Motors (PM motors) for dynamic adjusting of motor parame-
ters as stator resistance (par. 1-30 Stator Resistance (Rs)) for PM
motors and also rotor resistance (par. 1-31 Rotor Resistance
(Rr)) for asynchronous motors, depending on winding temper-
ature. The calculation is:
Rs Rs
=
C
20°
α = 0.00393
cu
KTY sensors can be used for motor protecting (par. 1-97 KTY
Threshold level).
FC 302 can handle three types of KTY sensors, defined in
par. 1-95 KTY Sensor Type. The actual sensor temperature can
be read out from par. 16-19 KTY sensor temperature.
46
FC 300 Programming Guide
Function:
Select the input to which the thermistor
(PTC sensor) should be connected. An
analog input option [1] or [2] cannot be
selected if the analog input is already in use
as a reference source (selected in
par. 3-15 Reference 1 Source,
par. 3-16 Reference 2 Source or
par. 3-17 Reference 3 Source).
When using MCB 112, choice [0] None must
always be selected.
x x T
(1 + α Δ ) Ω where
cu
MG.33.M9.02 - VLT
NOTE
If the temperature of the motor is utilized through a
thermistor or KTY sensor the PELV is not complied with
in case of short circuits between motor windings and
sensor. In order to comply with PELV the sensor must be
extra isolated.
1-95 KTY Sensor Type
Option: Function:
Select the used type of KTY sensor. This
parameter is available for FC 302 only.
[0] KTY Sensor 1 1 kΩ at 100
*
[1] KTY Sensor 2 1 kΩ at 25
[2] KTY Sensor 3 2 kΩ at 25
1-96 KTY Thermistor Resource
Option: Function:
Selecting analog input terminal 54 to be used as
KTY sensor input. Terminal 54 cannot be
selected as KTY source if otherwise used as
reference (see par. 3-15 Reference Resource 1 to
par. 3-17 Reference Resource 3).
This parameter is available for FC 302 only.
NOTE
Connection of KTY-sensor between
term. 54 and 55 (GND). See picture in
section KTY Sensor Connection.
[0] None
*
[2] Analog
input 54
1-97 KTY Threshold level
Range:
80 C [-40 - 140 C] Select the KTY sensor threshold level for
*
motor thermal protection.
This parameter is available for FC 302 only.
®
is a registered Danfoss trademark
o
C
o
C
o
C
Function: