13–10–612 Page 26
In any mode, the compressor will start only if reservoir
pressure is below 5 psig. The display will indicate if the
control is waiting for blowdown. The controls will keep
the compressor unloaded until the start cycle has been
completed.
Constant Run Mode Operation – This mode is best
used in applications where there are no long periods of
unloaded operation. The compressor unit will start and
run continuously, using its modulation controls to
match delivery to demand.
As demand falls below the compressor capacity, the
pressure will rise to the setpoint of the control. When
the pressure reaches the setpoint the AUTO
SENTRY–ES controller operates the solenoid valves
to pass pressure to the inlet valve piston and the inlet
valve closes enough to match air system demand. See
FIGURE 4–9, page 31.
As demand increases, the controller will modulate the
inlet valve by passing pressure with the solenoid valves
as required to match delivery to demand. See
FIGURE 4–8, page 30.
As demand further increases, the inlet valve is held
open, and delivery is controlled by the turn valve sole-
noids. This provides the most efficient delivery to match
demand under all conditions.
Low Demand Mode Operation – The low demand
mode reduces power consumption by relieving pres-
sure in the reservoir during unloaded operation. Under
loaded conditions, it will operate identically to the
constant–run mode described above.
During low demand periods, the controller will open the
blowdown valve and fully close the inlet valve to mini-
mize the motor load. See FIGURE 4–10, page 32. A
timer is started when this occurs. While in this state,
control air pressure is supplied from the plant air sys-
tem. When system air pressure drops due to increased
demand, the blowdown valve recloses and the controls
resume their normal modulation sequence.
Subsequent blowdown periods are not allowed until the
timer has completed its cycle. This cycle eliminates the
problems of oil foaming and carryover which can occur
if the oil reservoir of an oil–flooded compressor is blown
down too often. The timer is adjustable from 5 to 20
minutes.
Automatic Mode Operation – This mode provides au-
tomatic start and timed stop, and is best used in ap-
plications with long unloaded periods. Operation during
periods of demand or moderately long unloaded peri-
ods is identical to the low demand mode.
The Auto time delay is adjustable from 5 to 30 minutes.
If the controller operates unloaded for this period with
no demand, the compressor drive motor is halted to
eliminate its power consumption. The controls will re-
main in this state until demand is again indicated by a
drop in pressure.
Sequence Mode Operation – This mode provides for
communication between controllers, operating only as
many as are required for economical operation. The
lead unit operates identically to the automatic mode;
operation will be automatically staged for each lag unit.
Refer to Section 3 for additional description of se-
quenced operation.
Communication between controllers is achieved by in-
terconnection of a communications link to circuit board
connectors. A ”unit number” must be assigned to each
unit to operate in this mode (see ”Programming and
Setup” in this section).
CONTROLLER DISPLAY
The display above the keypad is used to provide oper-
ating information to the user. If a shutdown has oc-
curred, the display will indicate the cause as noted
above.
During normal operation the display will show the op-
eration mode, system pressure, compressor discharge
temperature, and total running hours. Alternate dis-
plays are available by pressing keypad cursor keys,
and will be identified on the display. These include res-
ervoir pressure, separator differential pressure, reser-
voir temperature, system pressure, and compressor
discharge temperature. In Low Demand, Automatic, or
Sequence modes, alternate displays also indicate re-
maining times of delay. If no keys are pressed for 5 se-
conds, the display will return to its normal mode.
The display is also used as a service reminder for nor-
mal maintenance items. These include the separator,
air filter, and oil filter change intervals. All intervals are
based on recommended parts as noted in the mainte-
nance section of this manual. Oil change intervals are
also automatically calculated, based on actual operat-
ing conditions. This allows maximum utilization of
AEON 9000 SP oil. Messages will also be displayed if
operation has occurred during low ambient tempera-
tures, or if high temperature operation has occurred.
Clearing Advisories – Temperature advisories may
be cleared while the unit is running by simply pressing
the ENTER key. To reset the service advisories ––
CHANGE SEPARATOR, CHANGE AIR FILTER,
CHANGE OIL, CHANGE OIL FILTER –– perform the
following steps:
1.
Press the STOP/RESET key to stop operation of
the compressor.
2.
Relieve all air pressure.
3.
Disconnect, tag and lockout power supply.
4.
Perform necessary maintenance, and record it on
maintenenace log.
Summary of Contents for ELECTRA-SAVER EAU PD - 200 HP
Page 13: ...13 10 612 Page 3 FIGURE 1 4 STARTER BOX FIGURE 1 5 PACKAGE CONTROLLER AND STARTERS...
Page 16: ...13 10 612 Page 6 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 17: ...13 10 612 Page 7 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 40: ...13 10 612 Page 30 FIGURE 4 8 CONTROL SCHEMATIC COMPRESSOR AT FULL LOAD 214ECM797 Ref Drawing...
Page 42: ...13 10 612 Page 32 FIGURE 4 10 WIRING DIAGRAM 212EAP546 Ref Drawing...
Page 43: ...13 10 612 Page 33 FIGURE 4 11 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 45: ...13 10 612 Page 35 FIGURE 5 1 FLOW DIAGRAM AIR OIL SYSTEM 215EAU797 Ref Drawing...
Page 65: ......