Temperature Sensors For 1Fn1 And 1Fn3 Motors - Siemens SINUMERIK FM-NC Installation And Startup Manual

6 Assigning Parameters to the Control and the PLC Program
6.10 Linear motors (1FN1 and 1FN3 motors)
6.10.5

Temperature sensors for 1FN1 and 1FN3 motors

Description of
1FN1
Description of
1FN3
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6-166
The following temperature sensing system is integrated in the primary part of
1FN1 motors:
1. Temperature sensor (KTY 84)
The KTY 84 temperature sensor has an approximately linear characteristic
(580 ohms at 20 °C and 2.6 kohms at 300 °C).
2. Temperature switch (3 series-connected NC contacts)
A switch with a two-position characteristic and an operating temperature of
120 °C is fitted for each winding overhang.
The temperature switch is generally only used for parallel connections or
protective separation.
The switches can be evaluated additionally by a higher-level external control
(e.g. a PLC). This option is recommended if the motor is frequently loaded at
maximum force at standstill.
As a result of different current levels in the 3 phases, different temperatures
(by as much as 15 K) may occur in the individual winding overhangs; only
temperature switches are capable of sensing them reliably.
The following temperature sensing system is integrated in the primary part of
1FN3 motors:
1. Temperature sensor (KTY 84)
The KTY 84 temperature sensor has an approximately linear characteristic
(580 ohms at 20 °C and 2.6 kohms at 300 °C).
2. PTC thermistor detector
A temperature sensor for each phase is integrated in the winding over-
hangs.
The operating temperature of the PTC sensor is 120 °C.
The 3RN1 thermistor motor protection control unit is the preferred option for
evaluating PTC detectors.
Note
If the temperature sensors or switches are not connected, they must be short-
circuited and connected to PE as protection against electrical damage and high
touch voltages.
Important
When connecting up the temperature monitoring circuits, please read the spec-
ifications according to DIN EN 50178 regarding protective separation.
For information about protective separation, please refer to:
References: /PJLM/ Planning Guide for Linear Motor
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
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