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DATA SHEET
9
TEMPERATURE AND FAN CONTROL
To achieve best cooling results sufficient airflow through the supply must be ensured. Do not block or obstruct the airflow at
the rear of the supply by placing large objects directly at the output connector. The PFE850-12-054NA is provided with a
normal airflow, which means the air enters through the rear of the supply and leaves at the front. The PFE8500-12-054RA is
provided with a reverse airflow, which means the air enters through the front of the supply and leaves at the rear. PFE sup-
plies have been designed for horizontal operation.
The fan inside of the supply is controlled by a microprocessor. The rpm of the fan is adjusted to ensure optimal supply cool-
ing and is a function of output power and the inlet temperature.
For the normal airflow version additional constraints apply because of the AC-connector. In a normal airflow unit, the hot air
is exiting the power supply unit at the AC-inlet.
The IEC connector on the unit is rated 105°C. If 70°C mating connector is used then end user must derate the input power to
NOTE: It is the responsibility of the user to check the front temperature in such cases. The unit is not limiting its power auto-
matically to meet such a temperature limitation.
Figure 38 - Airflow direction
25
Normal Airflow
Reverse Airflow
Figure 39 - Fan speed vs. main output load for
PFE850-12-054NA
25
Normal Airflow
Reverse Airflow
Figure 40 - Fan speed vs. main output load for
PFE850-12-054RA
20
High Line fan curve
Low Line fan curve
Min speed at ISB > 3A
20
High Line fan curve
Low Line fan curve
Min speed at ISB > 3A
10
15
10
15
For additional information use other data files, or ask.
All materials used, and finished product, must meet the requirements of the current RoHS directive 2002/95/EC.
Material
Finish
Tolerances unless otherwise stated:
0.5-30: ±0.1
>30-120: ±0.15
>120-400: ±0.2
Issued
2009-09-17
WH
Title
Modified
2009-11-10
WH
5
SNP Family Product GA
5 Size
Scale
Dim. in mm
Sheet
Mech. Eng. approved
Elec. Eng. approved
Mfg. approved
Drawing No.
-
-
-
-
-
-
Revision
www.power-one.com
A3
5/5 SNP1100-12G_GA
003
Supersedes:
0
0
0
20
40
60
80
0
20
40
60
80
Main Output Current [A]
Figure 41 - Thermal derating for PFE850-12-054NA
Main Output Current [A]
Figure 42 - Thermal derating for PFE850-12-054RA
1000
800
800
600
600
400
200
0
Vi > 90VAC
Vi > 115VAC
Vin = 90VAC
Vin = 115VAC
400
200
0
Vi > 90VAC
Vi > 145VAC
Vi > 180VAC
0
10
20
30
40
50
60
0
10
20
30
40
50
60
Ambient Temperature [°C]
Ambient Temperature [°C]
PFE850-12-054xA
18
www.power-one.com
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