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13–10–613 SP Page 19
Low Demand Mode Operation – The low demand
mode reduces power consumption by relieving pres-
sure in the reservoir during unloaded operation. This
mode is best used where there is moderate air storage
and there are unloaded periods during the day, but fre-
quent motor starting and stopping is undesirable. Dur-
ing periods of moderate to high demands, this mode is
identical 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. A timer is reset when this occurs.
While in this state, control air pressure is supplied from
the plant air system (as are any plant loads). When the
system air pressure drops to the reset pressure due to
increased demand, the blowdown valve recloses and
the controls resume their normal modulation to main-
tain the system pressure near the set pressure.
Subsequent blowdown periods are not allowed until the
timer has completed its cycle. This cycle eliminates
frequent blowdowns during moderate loads, and the
energy required to repressurize the reservoir. The tim-
er is adjustable from 5 to 20 minutes.
Automatic Mode Operation – This mode provides
automatic start and timed stop, and is best used in ap-
plications with long unloaded periods (e.g. idle shifts or
weekends) and adequate storage to allow the com-
pressor to be stopped for periods of light demands. Op-
eration during periods of moderate to heavy demands
are identical to the low demand mode.
The automatic time delay is adjustable from 5 to 20
minutes. If the controller operates unloaded for this pe-
riod with no demand, the compressor drive motor is
halted to eliminate its power consumption. The con-
trols will remain in this state until demand is again indi-
cated by a drop in pressure.
This is the most common selected mode of operation,
as it automatically will operate the compressor unit in
the most efficient manner for the demand of the air sys-
tem.
Sequence Mode Operation – This mode provides for
communication between controllers, operating only as
many as are required for economical operation. This
is best used on applications with large storage capacity
and diverse loads. The lead unit will operate identically
to the automatic mode; operation will be automatically
staged for each lag unit (up to 8 total). For more in-
formation, refer to the sequencing instructions later in
this chapter.
FIGURE 4–1 – AUTO SENTRY
–ES+ DISPLAY
Summary of Contents for ELECTRA-SAVER EAYQ E
Page 15: ...13 10 613 SP Page 6 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077 ...
Page 16: ...13 10 613 SP Page 7 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077 ...
Page 31: ...13 10 613 SP Page 22 FIGURE 4 2 FLOW CHART FOR SET UP PROGRAMMING ...
Page 48: ...13 10 613 SP Page 39 FIGURE 4 13 WIRING DIAGRAM 202EAY546 Ref Drawing ...
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