TET2000 Series

21

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TEMPERATURE AND FAN CONTROL

10.1 FAN CONTROL

To achieve best cooling results sufficient airflow through the supply must be ensured. Do not block or obstruct the air-flow at

the rear of the supply by placing large objects directly at the output connector. The TET2000-12-086NA is provided with a rear

to front airflow, which means the air enters through the DC-output of the supply and leaves at the AC-inlet and TET2000-12-

086RA is reversed. The fan inside of the supply is controlled by a microprocessor. The rpm of the fan is adjusted to ensure

optimal supply cooling and is a function of output power and the inlet temperature.

Figure 40. Airflow Direction

Figure 41. Fan Speed vs. Main Output Load

10.2 TEMPERATURE MONITOR AND OVER TEMPERATURE PROTECTION

The TET2000-12-086 Series provides access via I2C to the measured temperatures of in total 4 sensors within the power

supply, see

Table 10. The microprocessor is monitoring these temperatures and if warning threshold of one of these sensors

is reached it will set fan to maximum speed. If temperatures continue to rise above shut down threshold the main output V1

(or VSB if auxiliary converter is affected) will be disabled. At the same time the warning or fault condition is signalized

accordingly through LED, PWOK and SMB_ALERT_L.

TEMPERATURE

SENSOR

DESCRIPTION / CONDITION

POWER

MANAGEMENT

BUS REGISTER

WARNING

THRESHOLD

SHUT DOWN

THRESHOLD

Inlet air temperature

Sensor located on control board close to DC

end of power supply

0x8D

NA:62.5C

RA:62.5C

NA:65C

RA:65C

Oring Mosfet

Sensor located close to Oring Mosfet

0x8E

NA:90C

RA:105C

NA:95C

RA:110C

Outlet air temperature

Sensor located on main board close to AC

front of power supply

0x8F

NA:80C

RA:85C

NA:85C

RA:90C

PFC&DC-DC heat sink

Sensor located on PFC heat sink and DC-DC

heatsink

NA&RA:130C

Table 10. NA revision Temperature Sensor Location and Thresholds

4000

6000

8000

10000

12000

14000

16000

18000

20000

22000

24000

26000

0%

20%

40%

60%

80%

100%

Output Loading(%)

FanSpeed(RPM) vs Loading(%) & Inlet Tempr(degC)

25degC

35degC

45degC

55degC

RA/Reverse Airflow

NA/Normal Airflow