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17
Tecnotion
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Ironless linear mot
or manual - v
er
. 1.03
INSTALLATION
CH 3
3.7.6 PTC specification
The PTC-1k type is a sensor which has a very sudden resistance rise near the
critical temperature of the coils. It is almost a digital indicator: temperature
below vs. over critical temperature. Therefore it is very useful for signalizing
over temperature without requiring sensitive electronics. Disadvantage is
that it is not possible to obtain a temperate signal.
At room temperature the PTC has an electrical resistance <100 Ω. When the
temperature raises to the critical temperature the resistance will increase
rather uniformly up to 1000 Ω. Above this temperature the resistance in-
creases exponentially. Now, 1000 Ω is the switching resistance. The ampli-
fier should immediately stop the power supply when this resistance is ex-
ceeded. In this way overheating and motor damage can be prevented. No
need to say that the PTC cable must be connected properly to the amplifier.
Temperature
Resistance
Up to 20°C below critical temperature
< 250 Ω
Up to 5°C below critical temperature
< 550 Ω
Nominal switching resistance
1000 Ω
Above critical temperature
> 1330 Ω
Table 3.13: Resistance range of the PTC-1K sensor
3.7.7 Maximum operating temperature
Series
Maximum operating temperature
UC
800C
UF, UM, UL, UXA, UXX
1100C
T (°C)
R (Ω)
10
30
50
70
90
110
130
150
180
10
1
10
2
10
3
10
4
10
5
10
6
10
7
Graph 3.14: Temperature dependence of the PTC-1k sensor. The sensor follows the 110°C
characteristic
