Hitachi HISCREW 2000 Series - Page 33

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6. SYSTEM OF EACH COMPONENT [Capacity Control System]
IMPORTANT
Even when the automatic-stop conditions are satisfied,
the condensate control function (i.e. some ambient and
operating factors) may cause the motor to continue op-
erating. This is not abnormal.
6.2.4 Condensate Control Function
Condensate control is a standard feature of the
M-type A. This function works so that the
condensate can be minimally produced when the
air compressor repeats an automatic stop/restart.
Because the condensate is nevertheless produced
and collected in the oil case when the air compres-
sor is in an automatic stop, the condensate control
function also works so that the condensate can be
evaporated and carried over together with the com-
pressed air.
(1) The condensate control function is activated
not when you press the START button but
when the A (in an automatic stop) re-
starts automatically.
(2) The memory stores a condensation tempera-
ture that depends on the discharge pressure
(e.g. 70°C for 0.69 MPa). Based on the operat-
ing pressure and temperature detected by the
sensors, the CPU checks whether the operat-
ing temperature is lower or higher than the
stored condensation temperature. If lower, al-
ways the U-type capacity control is selected to
increase the operating temperature and thus
minimize the condensate production. If higher,
always the I-type capacity control is selected.
Afterwards, the P-type capacity control may
be selected and, when the conditions are sat-
isfied, the motor may be automatically stopped.
6.2.5 ECOMODE Function
ECOMODE function is a standard feature of the
S- and M-type A. It is disabled, however,
by Hitachi before shipping the A.
(1) How ECOMODE Function Works
If you want to enable the ECOMODE function
under the I-type capacity control, press the
ECOMODE button. Make sure that the
ECOMODE light becomes on (non-flashing).
When a load-unload cycle is below 30 seconds
(a reference time) for shifting to the
ECOMODE function, the standard cutoff pres-
sure is used with the ECOMODE light non-
flashing.
When a load-unload cycle is 30 seconds or over,
the ECOMODE function begins to work and
thereby the optional lower cutoff pressure is
Loaded Totally
for 3 Minutes?
Discharge Temperature >
Condensation Temperature?
NO
YES
YES
NO
NO
YES
YES
I-Type Control
P-Type Control
Automatic Restart
I-Type Control
Continued for
15 Minutes?
Loaded Totally
for 3 Minutes?
Closing of
Suction Throttle
Valve for
5 Minutes
NO
U-Type Control
DRYER
ドライヤー 
エコモード
SELECT
警報
SHUTDOWNALARM
RESET
表示切替
10h×
リセット
故障
C：温度 TEMP
RUNNINGCONTROL 運転管理
ECOMODE
ECOMODE
エコモード
Ｅ：故障コード ERRORCODE
ECOMODE Light
Off when disabled
On (non-flashing) when enabled
On (flashing) when worked
ECOMODE Button
to enable or disable