Hitachi NEXT Series Instruction Manual page 35
Oil-free rotary screw air compressor
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Also See for NEXT Series:
- Instruction manual (110 pages) ,
- Instruction manual (127 pages) ,
- Service manual (85 pages)
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3.5.3 While Operating the Air Compressor
AUTO
MONITOR
MENU
+/-
UP/
DOWN
SET
MONITOR
IMPORTANT
● For Vtype, if the ambient temperature is approximately
32℉ (0 degree C), air compressor tries to start for 1 to 2
seconds and may start at approximately 20 seconds after.
This is not failure but caused by RETLY function of
controller. In such case, E0.44 appear on the digital
monitor and AUTO START light turns on (blinking).
3.5.4 When Stopping the Air Compressor
②
DIS. PRESS:
００ｐｓｉ
INTERSTG P:
００ｐｓｉ
OIL PRESS:
００ｐｓｉ
CLT PRESS:
＊＊ｐｓｉ
③
3. OPERATION PROCEDURE [Daily Operation of Air Compressor]
RUNNING CONTROL
RUNNING MODE
REMOTE
POWER
ALARM
LOAD
［× 10h］
AUTO START
RESET
FUNC
SHUTDOWN
REMOTE
SELECT/WIDE
START
STOP
1
2
STR
UNLOAD STOP
RUNNING CONTROL
RUNNING MODE
REMOTE
POWER
ALARM
LOAD
AUTO START
RESET
FUNC
SHUTDOWN
REMOTE
SELECT/WIDE
START
STOP
STR
1
2
①
UNLOAD STOP
④
[Rear View]
① Check the LCD monitor for operating pressures and
temperatures, and verify that:
- Interstage pressure (INTSTG P), oil pressure (OIL PRES),
1st stage discharge air temperature (DIS. TEMP 1), 2nd stage
discharge air temperature (DIS. TEMP 2), oil temperature
(OIL TEMP) and 2nd stage suction temperature (2ND SUCT.
T) stays within the normal range. (
② Verify that the intercooler/aftercooler condensate
drain is discharged intermittently when the air
compressor is loading.
Automatic drain
Model
valve: Open
45/55 kW
2 sec
75 kW
2 sec
When the air compressor is unloading, condensate drain is
discharged one (1) second a five (5) minutes.
● For air-cooled type, restart the air compressor 30 seconds
after stopping. If the air compressor restarts just after
stopping, the shutdown may occur with indication
"OVERLOAD SUB" on LCD monitor and E0.53 on digital
monitor.
① Press the UNLOAD STOP button to stop the air
compressor.
T he air compressor unloads for 5 minutes and stops.
(In the case of an emergency, press the STOP button.)
② Check the pressure after the air compressor stops
running.
- Both oil pressure and interstage pressure shall be 0 psi.
( The pressures may be 1 psi (0.01 MPa) depending on
operation conditions.)
③ Check the sight glass on the control line filter to
confirm that drain is properly discharged. (Fixed-
speed type)
④ Close the valve on the discharge side.
Water-Cooled
⑤ Close the cooling water stop valve. Open the petcock
and cooling water drain valve to drain the cooling
water from the air compressor. Be careful not to
damage the parts, such as coolers and casing, by
cooling water freezing.
6.1.3)
Automatic drain
valve: Closed
45 sec
30 sec
33
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Troubleshooting
