Electrical System - Quincy QGB Series Instruction Manual

Electrical System

Electrical system diagrams are shown in
the parts manual sent with the compressor.
The appropriate diagram is also included
in the control panel on all Quincy QGB
compressors.
notiCe!
D u e t o c o n t i n u o u s
improvements and updates, it is
suggested that the wiring diagram
included in the control panel be used
when servicing the electrical control.
Standard QGB drive motors are totally
enclosed fan-cooled (TEFC), 800
RPM motors with a maximum ambient
temperature rating of 04°F (40°C).
QGB ™ series compressors utilize 460V
incoming power through a wye-delta
starter. A dual output transformer in the
control panel reduces this voltage to
20/24 VAC for the various controls on the
unit. These controls include the PLC, HMI,
high air temperature safety switch and
solenoid. Other incoming line voltages are
available as options. The compressor is
provided with a NEMA 4 enclosure.
™
High voltage could cause death or
serious injury. Disconnect all power
supplies before opening or servicing
the electrical enclosure.
p r o d u c t
High Air Temperature Switch
A high air temperature (HAT) switch is
standard on QGB
located in the discharge line from the
compressor to the air/fluid reservoir and
protects the unit by sensing unusually high
temperatures and shutting the unit down.
The HAT is set to trip at approximately
235°F and is nonadjustable.
Never remove, bypass or tamper with
the 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 temperature, contact a qualified
service technician immediately.
Quincy Compressor-QGB
Section II - Description
Danger!
units. The HAT is
™
Warning!
™
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