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Section II - Description
12 Quincy Compressor
®
- QSD™
The Power$ync II
™
controller allows the customer to
select Auto Dual as an alternate control method. Auto
Dual incorporates a timer which will turn the compressor
off if it remains in the unloaded condition for a preset
length of time. If the system pressure remains above the
preset pressure for the programmed time interval,
Power$ync II
™
places the compressor in Standby Mode,
with the drive and fan motors de-energized. The
Power$ync II
™
controller waits for an indication of
demand, recognized as a drop in system pressure to a
preset minimum pressure level, and automatically restarts
the compressor.
Essentially equal to Continuous Run, Auto Dual goes a
step beyond to offer the opportunity for additional power
savings in a system with more dramatic differences in
demand. As demand changes with shift changes or
varying operations, the Power$ync II
™
controller will
allow the QSD
™
compressor to go into Standby Mode
when compressor output is not needed. Like the
Continuous Run Mode, a properly sized air receiver will
ensure that the compressor operates and reacts properly
as air system demand changes.
NOTE
Refer to section VIII for Power$ync II
™
operating
instructions.
Electrical System
A diagram of the electrical system is shown in the parts
manual shipped with the compressor. A wiring diagram
is also included in the control panel of all Quincy
compressors.
NOTE
Due to continuing product improvements and
updates, it is suggested that the wiring diagram
included in the control panel be used when
servicing the electrical control.
NOTE
Standard drive motors are open, drip-proof, with
a maximum ambient temperature rating of 40°C.
They are not suitable for salt laden, corrosive,
dirty, wet or explosive environments.
The standard QSD
™
compressor utilizes 460V incoming
power through an across the line magnetic starter. A
transformer in the control panel reduces this voltage to
120 VAC for the various controls on the unit. These
controls include the selector switch, pressure switch,
timer, high air temperature (HAT) safety switches,
solenoid valve and various indicator lights. Other
incoming line voltages are available as options. A
NEMA 4 electrical enclosure is standard.