Siemens SLI-5310 Instruções de Operação descarregar pdf (Página 42)

In order to protect a motor from an exces-

sive load, the motor manufacturer usually

installs a temperature sensor near the mo-

tor coil. In classic applications, the values

from the temperature sensor are led via

two separate lines to the subsequent elec-

tronics, where they are evaluated. With

HEIDENHAIN encoders for servo drives,

the temperature sensor can be connected

to the encoder cable inside the motor

housing, and the values transmitted via the

encoder cable. This means that no separate

lines from the motor to the drive controller

are necessary.

Integrated temperature evaluation

Besides the integrated temperature

sensor (accuracy at 125 °C: approx. ± 4 K

for ECN/EQN 1300 or approx. ± 1 K for

ECI/EQI 1300), encoders with EnDat 22

interface also permit connection of an

external temperature sensor (not with

ECI 1118). The encoder also evaluates the

external sensor signal. The digitized

temperature value is transmitted purely

serially without additional lines via the

EnDat interface as additional information.

Connectable temperature sensors

The temperature evaluation within the

rotary encoder is designed for a KTY 84-

130 PTC thermistor. If other temperature

sensors are used, then the temperature

must be converted according to the

resistance curve. In the example shown,

the temperature of 100 °C reported via

the EnDat interface is actually 25 °C if a

KTY 83-110 is used as temperature sensor.

Resistor

KTY 84-130

Value in additional

datum 1

Temperature

353  2331 -40 °C

595  2981 25 °C

713  3231 50 °C

872  3531 80 °C

990  3731 100 °C

1181  4031 130 °C

1392  4331 160 °C

1702  4731 200 °C

2141  5231 250 °C

2332  5431 270 °C

Relationship of resistance values for KTY 84-130, values in the additional

datum 1 of the EnDat interface, and temperature

Due to the low measuring current (approx. 1 mA instead of 2 mA), the

resistance value were corrected downward compared with the data sheet

speciﬁ cation of KTY 184-130 (e.g. 990  instead of 1000 ).

Relationship between the temperature and resistance value for KTY 84-130 and KTY 83-110 indicating

the accuracy of temperature measurement and with a conversion example

Temperature measurement in motors

Temperature [°C]

Resistance []

Antriebsgeber_en_2013.indd 42 12.11.2013 06:55:08

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 95 96

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Siemens SLI-5310 Instruções de Operação Página 42

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