Starting; During Operating - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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6. STARTUP OPERATION [Startup Operation of the Air Compressor]

6.1.2 Starting

③④
DIS. PRESS:      100psi
INTSTG. P:         22psi
OIL PRESS:            22psi
CLT PRESS:       **psi
① Fully open the discharge stop valve, and press the
START button.

6.1.3 During Operating

AUTO
MONITOR
MENU
+/−
UP/ 
DOWN
SET
MONITOR
① Grease the main motor bearing at once. Refer to the
9 Maintenance 13 for the detail.
48
RUNNING CONTROL
RUNNING MODE
REMOTE
POWER
ALARM
LOAD
RESET
AUTO START
FUNC
SHUTDOWN
REMOTE
SELECT/WIDE
START
STOP
STR
UNLOAD STOP
[Rear View]
RUNNING CONTROL
RUNNING MODE
REMOTE
POWER
ALARM
LOAD
[× 10h]
RESET
AUTO START
FUNC
SHUTDOWN
REMOTE
SELECT/WIDE
START
STOP
2
STR
1
UNLOAD STOP
② Verify that the air compressor has proper rotation.
If rotation is not correct (phase reversal), change 2 of
the 3 wires of the power cable.
③ Verify that the oil pressure rises 18 psi (0.12 MPa) or
greater within ten (10) seconds after starting the air
compressor. If pressure has failed to rise, press the
STOP button and clean the oil strainer. And/or
regulate the oil pressure by oil relief valve. (
④ In the case of the fixed speed type, switch to full load
operation within 20 seconds, and for the V type,
switch in approx. 10 seconds.
⑤ Raise the pressure step by step as illustrated below.
Pressure Raising Pattern
100
for the rated
90
discharge pressure
100 psi (0.69 MPa)
75
Method of Raising Pattern:
60
During startup operation, raise the discharge pressure by
following these steps. 1.) After starting the air compressor,
45
operate at 29psi (0.20MPa) for 30 minutes with the discharge
stop valve completely open. 2.) Raise the pressure 14 psi
30
(0.1MPa) (close the discharge stop valve) every 15 minutes
until the pressure reaches the rated pressure. During the
15
startup operation, perform this method without any failures.
0
0.5hr
1hr
Time
② Check the LCD for operating pressures and
temperatures. Verify that: Discharge air pressure
(DIS. PRESS), interstage air pressure (INTSTG. P),
oil pressure (OIL PRES), 1st stage discharge air
temperature (DIS. TEMP 1), 2nd stage discharge air
temperature (DIS. TEMP 2), 2nd stage suction
temperature (2ND SUC. T.) and oil temperature (OIL
TEMP) are within the normal range, as shown in the
Proper Pressure/ Temperature Indications on LCD
table below.
③ Verify that the condensate is discharged intermediately
from the intercooler/aftercooler drain port.
CAUTION
Ensure that the main motor is properly greased
during the start up commissioning. If the air
compressor has not been operated for (3)
months, grease before restarting. (
WARNING
During inspection of the operation of the air
relief valve, use the appropriate facial protec-
tion. High pressure air containing dust particles
can cause severe injury.
3.7)
1.5hrs
2hrs
9.4 14 )

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