Chapter
8
Technical Information
HC8X Heat Control
8-42
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SICK AG · All rights reserved
8010043
Troubleshooting
8.4
Automatic Over-Temperature Protection of
Control Electronics
A self-resetting safety temperature switch on the control side protects the control electron-
ics from thermal damage (see Fig. 8-1).
When the inside temperature of the control unit is T
max
>
50
C, the safety temperature
switch switches off the power section. The communication between the measuring system
PC and the I/O units is maintained.
After the temperature has significantly cooled (by at least 10 K), the heat control is enabled
again.
Fig. 8-1:
Arrangement of the Fuses and the Over-Temperature Protection
SI3
SI2
SI1
2
3
1
1
Secondary-side fuses of the control electronics
2
Automatic over-temperature protection of control electronics
3
Power electronics overload protection