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090.040-O (MAR 12)
Page 40
ACCESSING:
DESCRIPTION: The Capacity 1 -4 screens are identical
in appearance. All setpoints having to do with Capacity
Control, Autocycle, Mode Safeties and Low Suction are
found here.
Capacity Control is setup by accessing the Confi guration
> Capacity Control screen. From that screen, the user can
enable or disable any of the four possible modes, as well
as select the channel that they wish to control from, and
select whether the control will be Forward or Reverse
acting.
CAPACITY 1 (2, 3, 4)
The Capacity Control screen shown above dis-
plays four window areas of information:
Setpoint - This setpoint is used to control
the loading and unloading of the compres-
sor when the Capacity Control is in the
AUTO (Automatic) or in REM SEQ (Remote
Sequencing) modes.
Proportional Band High - A band, mea-
sured in the units of the Capacity Control
setpoint, above the Dead Band High, where
proportional load or unload control is used.
If the actual reading rises into this propor-
tional band the load or unload output will be
pulsed as explained below in the description
about proportional band.
QUANTUM™ HD COMPRESSOR CONTROL PANEL
OPERATION
CONTROL SETPOINTS
Capacity Control
Capacity Control
Capacity 1
Proportional Band Low - A band, mea-
sured in the units of the Capacity Control
setpoint, below the Dead Band Low, where
proportional load or unload control is used.
If the actual reading falls into this propor-
tional band the load or unload output will be
pulsed as explained below in the description
about proportional band.
escription Of Proportional Band
D
Control: The Proportional Band set-
point determines a range of Capac-
ity Control values where pulsed output
control is used. Outside of the propor-
tional band the output is continuously
energized. The length of time the out-
put will be pulsed on is proportional to
the distance the actual reading is from
the Capacity Control setpoint. The fur-
ther the distance from setpoint, the
longer the output is pulsed on and the
shorter the output is off. The closer
the distance to setpoint, the shorter
the output is pulsed on and the longer
the output is off. If the actual reading
is midpoint from setpoint, the output is
on and off an equal amount of time.
Dead Band High - A band, measured in the
units of the Capacity Control setpoint, above
the setpoint at which the compressor will
neither load nor unload.
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