Quincy QGV Series, Instruction Manual

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Section II - Description
Electrical System
A diagram of the electrical system is
shown in the parts manual sent with the
compressor. A wiring diagram is also
included in the control panel on all Quincy
QGV compressors.
notiCe!
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.
Standard drive motors are open drip
proof 800 RPM with a maximum ambient
temperature rating of 04°F. They are not
suitable for salt laden, corrosive, dirty, wet
or explosive environments.
The QGV series compressors utilize 460V
incoming power through a magnetic
starter. A transformer in the control panel
reduces this voltage to 20 VAC for various
electronic controls on the unit. These
controls include the pressure transducer,
high air temperature safety switch and
probe, solenoid valve and various indicator
lights.
Other incoming line voltages are available
as options. The compressor is provided
with a NEMA enclosure. Optional panels
include NEMA 4.
Air-cooled models utilize a second
magnetic starter for protection of the fluid
cooler fan motor. This starter is connected
to the compressor starter through an
interlock which insures the fan motor is
operating with the compressor motor. If
the fan motor starter trips out for any
reason, the compressor unit will shut down.
Danger!
High voltage could cause death or
serious injury. Disconnect all power
supplies before opening the electrical
enclosure or servicing.
Safety Sensors
Two high air temperature (HAT) sensors
are standard on QGV units. These sensors
protect the unit by sensing unusually high
temperatures and shutting the unit down.
One is located in the discharge line from
the compressor to the air/ fluid reservoir.
The second is located in the top of the
air/fluid reservoir. These sensors are set to
trip at approximately 225°F. The sensors
are nonadjustable.
Warning!
Never remove, bypass or tamper
with the safety HAT switch. Failure
to provide this safety feature could
cause death or serious injury and
property damage. If the compressor
is shutting down due to high discharge
temperature, contact a qualified service
technician immediately.
Quincy Compressor-QGV Series
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