1-93 Thermistor Source
Option:
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
3-15 Reference 1 Source
,
3-16 Reference 2
Source
or
3-17 Reference 3 Source
).
When using MCB 112, choice [0]
None
must
always be selected.
[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
5-00 Digital I/O Mode
.
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
parameters as stator resistance (
for PM motors and also rotor resistance (
) for asynchronous motors, depending on winding
temperature. The calculation is:
Rs = Rs20° C x (1 +
α
cu x
Δ
T )
Ω
where
α
cu = 0.00393
KTY sensors can be used for motor protecting (
).
FC 302 can handle three types of KTY sensors, defined in
. The actual sensor temperature can be
read out from
NOTE!
If the temperature of the motor is utilized through a
thermistor or KTY sensor, the PELV is not complied with in
the event 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 the FC 302 only.
[0]
*
KTY Sensor 1 1 kΩ at 212°F [100°C]
[1]
KTY Sensor 2 1 kΩ at 77°F [25°C]
[2]
KTY Sensor 3 2 kΩ at 77°F [25°C]
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
to
This parameter is available for the 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:
Function:
80 C
*
[-40 - 140 C] Select the KTY sensor threshold level for
motor thermal protection.
This parameter
only applies for FC 302.
Parameter Descriptions
FC 300 Programming Guide
3-26
MG.33.MA.22 - VLT
®
is a registered Danfoss trademark
3
3