Danfoss FC 300 Design Manual page 145

FC 300 Design Guide
Digital input 33
Function:
Select the input to which the thermistor (PTC sen-
sor) 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 Source 1, 3-16 Reference
Source 2 or 3-17 Reference Source 3).
This parameter cannot be adjusted while the mo-
tor is running.
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 resist-
ance (par. 1-30) for PM motors and also rotor
resistance (par. 1-31) for asynchronous motors,
depending on winding temperature. The calcula-
tion is:
( 1 + α
Rs Rs x
=
20° C
α = 0.00393
cu
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 tempera-
ture can be red out from par 16-19.
NB!
If the temperature of the motor is uti-
lized through a thermistor or KTY sen-
sor the PELV is not complied with in
case of short circuits between motor
windings and sensor. In order to com-
ply with PELV the sensor must be extra
isolated.
factory setting
How to Programme
[6]
) Ω
x T
∆
where
cu
() display text []
MG.33.B7.02 - VLT is a registered Danfoss trademark
1-95 KTY Sensor Type
Value:
KTY Sensor 1
KTY Sensor 2
KTY Sensor 3
Function:
Select the used type of KTY sensor:
KTY Sensor type 1: 1Kohm at 100 degrees C
KTY Sensor type 2: 1Kohm at 25 degrees C
KTY Sensor type 3: 2Kohm at 25 degrees C
This parameter only applies for FC 302.
1-96 KTY Thermistor Source
Value:
None
Analog input 54
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.
This parameter only applies for FC 302.
1-97 KTY Threshold level
Value:
-40 - 140° C
Function:
Select the KTY sensor threshold level for motor
thermal protection. This parameter only applies
for FC 302.
value for use in communication via serial communication port
[0]
[1]
[2]
[0]
[2]
80° C
145