3-phase servomotors. FKM
3.
3-
PHASE SERVOM
O
TORS. FKM
T
empera
tu
re
se
nsors
172
· 102 ·
Ref.2105
FXM|FKM
SERVOMOTOR
3.3
Temperature sensors
PTC KTY84-130 thermistor
All FKM servomotors (except the FKM1 series) have a PTC KTY84-130
thermistor as thermal protection of the motor and it is located in the stator
winding. It has a positive temperature coefficient (PTC) and they should
be used in control and measurement systems within a range between -
40°C/-40°F) and 300°C/572°F. It is currently only available on FKM9
series servomotors. In FKM2/4/6/8 series has been discontinued. See
RTD Pt1000.
The following figure shows the resistance of the sensor as a function of the
ambient temperature (average values):
MANDATORY.
The supply voltage of the thermal protection temperature sensor, shall
fulfill requirements of low voltage limited energy secondary circuits DVC A
according IEC/UL 61800-5-1.
T- 3/4
Characteristics of the temperature sensor KTY84-130.
Sensor type
PTC KTY84-130 thermistor
Resistance at 20°C/68°F
581
Resistance at 100°C/212°F
1000
Sensor connection
Feedback cable
Servomotor series
FKM9
FKM2/4/6/8 ·KTY84 discontinued·
See
RTD Pt1000
.
F- 3/1
Sensor resistance as a function of room (ambient) temperature.
Note.
The two wires of the temperature sensor are included in the
feedback cable.
100
-100
200
300
0
Tamb (°C)
0
1
2
R (k
Icont = 2 mA
:
)
3
WARNING.
The temperature sensor KTY84-130 has polarity. If you wish to
manufacture your own feedback cable, make sure that the polarity is
correct. See the feedback cable diagrams later on. FAGOR supplies this
cable upon request.
DANGER. Risk of electric shock
.
Only temperature sensors that meet the safety isolation specifications
described in EN 61800-5-1 may be connectted to terminals “KTY84+” and
“KTY84-”. If these instructions are not complied with, there is a risk of
electric shock.
