Danfoss FC 300 Programming Manual page 54

2. How to Programme
1-93 Thermistor Source
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
3-16 Reference 2 Source
2
*
[0]
[1]
[2]
[3]
[4]
[5]
[6]
This parameter cannot be adjusted while the motor is running.
NB!
Digital inputs should be set to "No operation" - see
2.4.10. 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 (par.
1-30) for PM motors and also rotor resistance (par. 1-31) for asynchronous motors, depending on winding temperature. The calculation is:
Rs Rs C x
=
20°
KTY sensors can be used for motor protecting (par 1-97).
FC 302 can handle three types of KTY sensors, defined in par 1-95. The actual sensor temperature can be read out from par 16-19.
NB!
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.
54
par. 3-17 Reference 3 Source
or
None
Analog input 53
Analog input 54
Digital input 18
Digital input 19
Digital input 32
Digital input 33
( 1 + α cu x T ) Ω
Δ α
where
MG.33.M3.02 - VLT
).
par. 5-1* Digital Inputs .
= 0.00393
cu
®
is a registered Danfoss trademark
FC 300 Programming Guide
par. 3-15 Reference 1 Source par.
,