Ptc Specification; Maximum Operating Temperature - Tecnotion UC3 Series Manual

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
Up to 20°C below critical temperature
Up to 5°C below critical temperature
Nominal switching resistance
Above critical temperature
Table 3.13: Resistance range of the PTC-1K sensor

3.7.7 Maximum operating temperature

Series
UC
UF, UM, UL, UXA, UXX
©2016 Tecnotion BV - All rights reserved - The contents of this document are subject to change without prior notice.
Resistance
< 250 Ω
< 550 Ω
1000 Ω
> 1330 Ω
Maximum operating temperature
800C
1100C
R ( )
10
7
10
6
10 5
10 4
10 3
10 2
10
1
10 30 110
50 70 90
Graph 3.14: Temperature dependence of the PTC-1k sensor. The sensor follows the 110°C
characteristic
CH 3
Tecnotion | www.tecnotion.com | sales@tecnotion.com
T (°C)
130 150 180
17
INSTALLATION