B&R MAPPC800-ENG, User Manual, Page: 355 / 396

Appendix A • Maintenance Controller Extended (MTCX)
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355 Panel PC 800 User's Manual V 1.00
2.1 Temperature monitoring - Fan control
The MTCX constantly monitors the temperature using temperature sensors (see section 2.1
"Temperature monitoring - Fan control", on page 355), which directly determine how the fan is
controlled. The RPM depends on the temperature measured. The limit values depend on the
MTCX firmware version being used.
Once the start-up temperature is reached, the device is started at the minimum fan speed. The
maximum fan speed is reached at a start-up temperature of 16°C. The fan speed in this area is
controlled depending on the temperature.
For example, slide-in 1: 44°C + 16°C = 60°C --> maximum fan speed
The fans are first switched off again if the evaluated temperature remains 6°C lower than the
start-up temperature for a time span of 30 minutes (=lag-time).
Sensor range Start-up temperature Max fan speed at:
Board I/O + 60°C + 76°C
Board ETH2 + 60°C + 76°C
Board Power + 60°C + 76°C
Power supply + 60°C + 76°C
Slide-in drive 1 + 44°C + 60°C
IF slot + 65°C + 81°C
Table 228: Temperature limits of the fan (MTCX PX32 V1.01).