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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
par. 3-15 Reference 1 Source
,
par.
3-16 Reference 2 Source
or
par. 3-17 Reference 3 Source
).
[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
This parameter cannot be adjusted while the motor is running.
NB!
Digital inputs should be set to “No operation” - see
par. 5-1* Digital Inputs
.
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
20°
C x
(1 +
α
cu x
Δ
T
)
Ω
where
α
cu
= 0.00393
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.
2. How to Programme
FC 300 Programming Guide
54
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
2