1.0

1.0 CHARACTERISTICS BE MEASURED

1.1 Measuring the Air Volume and Static Pressure

Note：The above show the principle of operation measure the air volume and static pressure. The actual measurement can be provided automatically using a computer system. The capacitance changing type diaphragm system differential pressure transmitter will convert the values for air volume and static pressure in Place of pitot tube.

The equation：

Air volume Q = 60*C*(3.14/4)*D²√(2g/r*Pn)【m³/min】

C：Coefficient of nozzle air volume

D：Diameter of nozzle【m】

r：Air density (1.293*273/(273+t)*P/760)【Kg/m³】

t：Temperature【℃】

P：Air pressure【mmHg】

Pn：Differential pressure of air volume mmAq【Kg/m³】

g：9.8【m/sec²】

Maximum static pressure：A shown in the above figure, when closing the nozzle, the pressure in the A chamber will reach the maximum. This differential pressure (Ps) between the air pressure and the pressure in the A chamber can be called the maximum static pressure.

Maximum air volume： When opening the nozzle and absorbing the air using the auxiliary blower to make the static pressure zero (ps=0), the differential pressure (pn) between A chamber and B chamber will reach the maximum. The air volume obtained by applying the differential pressure (pn) to the above equation can be called the maximum air volume.

1.2 Performance Point

The performance point shall be cross the point of system impedance curve and air volume static pressure curve. The performance points shows an air volume of fan when the fan is applied in the equipments. The performance point curve as below：

1.3 Determination of Air Volume

According to experiment with actual equipment is the best way to be determined necessary air volume of fan, therefore, optimum air volume shall be calculated with the formula

Q=40W/(T2-TI)

Where Q：Required air volume【m³/min】
W：Amount of heat generation within cabin

T1：Temperature of intake air to cabin

T2：Temperature of exhausted air from cabin

1.4 Noise Level Testing

The acoustic noise is measured in an semianechoic chamber by means of B & K precision integrating sound level meter and the background noise level is below 20dBA The fan is running in free air with microphone at a distance of one meter from the fan intake.

Sound pressure level (SPL) which is environmentally dependent and sound power level (PWL) are defined as
SPL = 20 log10 P/Pref
and PWL = 10 log10 W/Wref
where P = Pressure
Pref = A reference pressure
W = Acoustic power of the source
Wref = An acoustic reference power
Fan noise data is usually plotted as Sound Power Level against the octave frequency bands. The measurement standard is according to: CNS 8753

2.0 CHARACTERISTICS DEFINITION

2.1 Rated current：Rated current shall be measured after 5 minutes continuous rotation at rated voltage.

2.2 Rated speed：Rated speed shall be measured after 5 minutes continuous rotation at rated voltage.

2.3 Start Voltage：The voltages that at enable to start the fan by sudden switch on.

2.4 Input power：Input power shall be measured after 5 minutes continuous rotation at rated voltage.

2.5 Locked current：Locked current shall be measured within one minute or rotor locked, after 5 minutes continuous rotation at rated voltage in clean air.

2.6 Air volume & static pressure：The air volume data and static pressures should be determined in accordance with AMCA standard or DIN 24163 specification in a double chamber testing with intake side measurement.

3.0 MECHANICAL INSPECTION

3.1 Rotation direction：Clockwise from the front face of the fan A clear "→" (arrow mark) shall be front on the body of housing.

3.2 Safe design：All fans have inter grated protection against locked rotor condition so that there can be no damage on winding and any electrical components. Restart is automatic as soon as any constraint running has been released.  

3.3 Polarity protection：No damage shall be found with reverse connection at rated voltage. Up to normal polarity, the fan shall be run normally.

3.4 Vibration Test：According to JIS C0040 Amplitude 1.5mm frequency 10°C55Hz 0.5 hour in 3 direction X,Y,Z. each, 3.6 Shock Test, JIS C0041 Acceleration of Gravity: 60G Time 6 msec. 3 direction X,Y,Z. each.

4.0 ELECTRICAL INSPECTION

4.1 Insulation resistance：More than 10,000,000 ohm between housing and plus end of lead wire (red color) at 250 V.D.C.

4.2 Dielectric strength：No damage can be found at 500 V.D.C. 60 sec or 600 V.A.C. 2 sec, measured with 5mA trip current between housing and plus end of lead wire.  

4.3 Life expectancy：Expected average life for rated voltage and continuous operation 50,000 hours ( ambient temperature 25°C and humidity 65%). Regarding definition of life expectancy. The fan motor is run continuously at normal temperature and normal humidity conditions at the rated voltage, initial characteristics are compared with the value after running, the levels are as below:  

If excess the level of above it's failure.

4.4 Insulation Class：A Class

5.0 ENVIRONMENT

5.1 Operating temperature：-10°C~+70°C (normal humidity)  

5.2 Storage temperature：Satisfy performance standards after 500 hours storage at 40°C ~ 70°C (normal humidity) with 24 hours recovery period at room temperature.

6.0 SAFETY APPROVE

AURICS's Fans are submit the standard of UL、CLC、TUV and CE

7.0 GUIDE TO RESEARCH OF FAN MOTOR

7.1 Guide to research of Fan Motor：
Computation of Required Draft Volume:

It becomes necessary to determine the draft volume when we force the equipment to be air cooled. Although it is advisable to obtain the air volume required for actual cooling by experiment, an approximate standard however, can be derived from the following formula:

Q=(50*HW)/T•••••••••••••••••(1)

Q=Required draft volume m/min

HW=Hat value of heat source KW

△T=T2 - T1

T1=Air temperature at air inlet.

T2=Air temperature at air outlet.

△T=Allowable temperature rise.

It's safe to assume  △T=8°C, So from formula(1)

Q=6.25*HW m/min

Example :Assuming Heat value within Equipment = 1 KW
temperature Rise within Equipment = 8°C
Q = 6.25 m3/min

7.2 System impedance of Equipment：

In accordance with the internal construction of the equipment to be cooled, the reistance will appear when passing air through the equipment. This will cause reduction of stationary pressure during the ventilation and is called the system impedance.

Consequently, it becomes necessary for us to give stationary pressure value hither than the impedance for performing ventilation to the equipment.

System Impedance can be given using the following formula :

P=Reduced pressure (mmH2O)
Q=Air Volume (m3/min)

P=KQn

k 5 Constant

n=Index to be determined by air flow
n=1:laminar flow
n=2:Turbulent flow (Normally n=2)

The constant K here cannot be determined unless measure it physically equipment by equipment.

7.3 Selection of the Fan：

The selection of fan is done in accordance with following steps:
a) Estimate the heat value (hw) of the heat source.
b) Determine the allowable temperature rise value T.