Jun-air OF300 series [cabinet] Manuel d'utilisateur télécharger pdf (Page 9)

Service

Please note that all service must be carried out by a qualiﬁed

person.

Adjustment of pressure switch

The working presure has ben preset from the factory, and it is

normally not necessary to change this.

However, if it is necessary to change the preset settings, the

instructions mentioned below should be followed carefully.

Warning!

The compressor is constructed and approved

for a max. pressure as stated under Technical

Specifications - do not adjust to a higher pressure.

Higher working pressure will reduce the lifetime of

the compressor.

The compressor will stop at max. pressure (stop pressure) and

start again at min. pressure (start pressure). The difference

between max. and min. pressure is the differens pressure.

Unscrew the lid of the pressure switch. Adjust max. pressure

adjusting the two springs marked A (clockwise: higher

pressure). Adjust the two springs identically.

Adjust the differens pressure adjusting the spring marked B

(clockwise: higher differens pressure, lower start pressure.

Test of pumping time

The pumping time indicates the condition of the compressor.

Check that there are no leaks in the system.

Empty the air receiver of compressed air so that the

pressure gauge shows 0 bar.

Close the ﬁlter regulator and check that the drain valve is

closed.

Start the compressor and note the time it takes until it is

turned off again by the pressure switch. Check that the

pumping time agrees with the technical speciﬁcations for

the actual compressor system.

Please note that the pumping time in this manual is given for 0

to max pressure. Deviations from this result in deviating results.

Important!

Always test the pumping time when cold. If the

compressor is warm, the pumping time will be

considerably longer.

Fault ﬁnding and repair

Important

Switch off and isolate from electrical supply before

removing any parts from the compressor. Empty air

receiver of air before performing any operation on the

compressors' pressure system.

1. Compressor does not start

The air receiver is pressurized. The motor will start when

the pressure has dropped to the preset start pressure.

Empty the receiver.

Check that the mains supply agrees with the motor label.

No power from mains. Check fuses and plug.

Bad connection or broken cable.

The motor is overheated and the thermal protection

has switched it off. When cooled the motor will turn on

automatically. Go to section 5.

The compressor has not been unloaded and there is back

pressure on the piston. Ensure that the compressor is unloaded

each time it stops.

The motor is blocked.

Defective capacitor.

The compressor makes a buzzing sound but does not start

Leaky non-return valve. Dismount the pressure pipe and

check if air leaks from the non-return valve. Clean and

replace.

The motor is blocked.

The compressor runs but the pressure does not increase

Intake ﬁlter clogged. Replace.

Non-return valve is clocked. Clean or replace.

Leaks in ﬁttings, tubes or pneumatic equipment. Check with

soapy water or by letting unit stay over night disconnected

from mains. Pressure drop should not exceed 1 bar.

Check the piston gaskets. Replace if necessary.

Defective valve plate. Contact your JUN-AIR distributor.

5. The motor gets very hot

The ambient temperature is too high. If the motor is installed

in a cabinet sufﬁcient ventilation must be ensured.

Leaks in ﬁttings, tubes or pneumatic equipment. Check with

soapy water or by letting unit stay over night disconnected

from mains. Pressure drop should not exceed 1 bar.

The compressor is overloaded.

6. The compressor runs even if no air is tapped

Leaks in ﬁttings, tubes or pneumatic equipment. Check with

soapy water or by letting unit stay over night disconnected

from mains. Pressure drop should not exceed 1 bar.

7. The compressor does not start at min pressure or does

not stop at max pressure.

Defective pressure switch. Replace.

Operating manual

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Jun-air OF300 series [cabinet] Manuel d'utilisateur Page 9

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