FAQ

1.Introduction for ordering

1.1  Please advise the Fan model, flow rate, pressure, speed and structure of fan50HZ or 60HZ.

1.2  If the fan on the deck, according to relevant provisions of the chassis thickness.

1.3  Please offer insulation class and protection class for fan motor (if not, the insulation class is F, protection class is IP55).

1.4  Our factory can offer the fans of special specification and usage according to the user's demands.

2. Use and maintenance:

2.1   Before installing the fans, should check whether each part is intact, whether the components are complete, whether the impeller and casing rotating direct are concordant.

2.2   When installing the duct of the inlet and outlet, should make the duct and fans be spontaneous identical, not join them forcing, not bring the weight of duct on the fans.

2.3  After installed the fans, check whether there is friction of collide between the impeller and the fixed parts by rotating the impeller. If collision, friction, loud noise or strong vibration happened, the fan should be restart after checking.
Avoid the fan being bumped and other substance or liquid entered the fans. Please clean the dust on blade of impeller in time, so as not to break the balance and strengthen the noise.

2.4  The  fans should be started-up while the inlet is opening,
2.5  After the fans wiring, the terminal box should be sealed, avoid the air or water in it.

2.6  As the fans operating, the motor electric current should be control strictly, not exceed the rated electric current. Avoid the motor burning,

2.7  The fans maintain must be done on stop working time. When burning, after check, should whether the every part of fans is normal.

2.8  As some fault occurred in fans operating, should find out the reason in time and think a way of resolution.

3. Explosion-proof grade:

Explosion-proof mark of explosion-proof fan could be ExdIIBT4, ExdIICT4,ExdIICT5 or others.
Dangerous explosive mixtures are graded according to their ability of spreading explosion; they are grouped according to their ignition temperature.
Grading and grouping of dangerous explosive mixtures.

groups→

    grades↓

T1

(420<t)

T2

(300<t450)

T3

(200<t300)

T4

(135<t200)

T5

(t100)

IIA

Methane

Ethane

Propane

Toluene

Acetic acid

Carbon monoxide

Benzene

Ethyl acetate

Methanol

Ethanol

Ethylenzene

dichloroethane

Petroleum

Gasoline

Fuel oil

Diesel oil

Diesel oil

turpentine

Acetaldehyde

Trmethylamine

 

 

IIB

Gas from coking coal

Cyan hydrogen

Naphthene

alkynes

Epoxyethane

Ethylene

acrylics

Vulcanized oxygen

Tetrahydrofuran

ether

Fluan

Diether

Ethyl ether

 

IIC

Hydrogen

Water gas

Acetylene cthyme

 

 

CS2

sulfur dioxide

4. Protection class:

The main function is to prevent man from damage of electricity or rolling and or to prevent solid object, water, oil from entering. 
It conforms to GB4942 and IEC 34-5.

code

meaning

 Initial .

meaning

second

meaning

   54

IP 55

   56

International protection grade

4

>1mm solid object

4

5

splash water

spray water

5

dust

6

sea tide

5. Insulation grade and temperaure rise limit:

It is necessary to separate with insulation material between electric parts and casing. Life of insulation material with insulation degree of its material and temperature have very closed relations. The motor is a element to conversion the energy and signal.
The motor consume energy itself during its running. Temperature rising is caused by energy consumption. Normally insulation degree and limit of temperature rise in method of resistance check are according to the follow table.It is according to GB755 and IEC34-1.

 insulation grade

 temp limit

 limit of temp rise

E

120

75k

B

130

80k

F

155

105k

H

180

125k