ROTAR Giga 100, Use & Maintenance Manual

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Rotar Giga 75-100 - Cod.197AA3900 - Rev.03 - 05/2007
12 12
12 12 12
9
olio / oil
aria+olio / air+oil
aria / air
6
7
8
4
5
11
12
1
2
3
10
13
TECHNICAL DIAGRAM
A
Motor
B
Compressor
C
Suction regulator
D
Oil separator tank
VO
Fast exhaust valve
S(NG)
Solenoid valve N.C
DS
Pressure transducer
MAX
Selector valve
PR
MIN
Min. pressure switch
PR
MAX
Max. pressure switch
MPVL
Min. pressure valve
OPERATING MODE
• During first start-up, motor is started and “star”
powered. During this phase compressor starts slowly,
solenoid valve is closed and suction regulator (2) is closed.
• The compressor is kept under these conditions for
about 6 seconds.
• This time over, motor is “delta” powered. Solenoid
valve is powered and enables suction regulator (2) opening.
The regulator sucks in air through filter (1).
• During this phase compressor is working at peak rpm
and starts compressing air inside oil separator tank (5),
through tube (4).
• Compressed air cannot escape through the min.
pressure valve (7), which is set at 3÷4 bar.
• Compressed air compresses oil inside tank (5) and
causes it to flow through tube (8) to the radiator (9).
Cooled oil is returned to filter (11) through tube (10).
•
From filter (11), oil reaches compressor (3) through
tube (12). Oil is mixed with sucked air to form an air/oil mixture
that provides sealing and lubrication of compressor moving
parts.
• The air/oil mixture goes back to tank (5), where air
and oil are first separated by centrifugation and then by the
oil separator filter (6).
• As a result, tank (5) will deliver air only to air radiator
(9) through tube (13). Air is then conveyed to mains through
a cut-off cock.
• Min. pressure valve (7) serves also as a check valve.
• Compressor delivers compressed air to outer air tank.
• Tank inner pressure increases until reaching max. calibration value.
• Once max. value is reached, pressure gauge starts timer and powers off solenoid valve of regulator (2).
• Regulator (2) closes and compressor stops compressing and starts idling.
• Timer continues counting until reaching set value and, if pressure is unchanged, stops the electric motor. If pressure drops
to minimum value set on controller, solenoid valve is powered and opens before timer counting is over.
• Regulator (2) opens and compressor operates under normal load; timer is reset.
• This cycle is automatically repeated.
A
B
C
D
VO
7
6
4
6 1
2
5
5
MAX
1 2
4
S(NG)
DS
PR MAX
PR MIN
MPVL
HDKG
7
2
5
OPERATION
6
5
Air discharge
Signal
Air+oil