QUANTUM™ HD UNITY SYSTEM CONTROLLER
MAINTENANCE
090.670-M (APR 2020)
Page 6
General Information
Introduction To The Quantum™HD Unity
System Controller
The Quantum HD Unity System Controller consists of two
major components. The main system control panel houses
the controllers for condenser, vessel, engine room, and
evaporator control. It also houses the digital and analog
I/O for the condenser, vessel, and engine room control.
The digital and analog I/O for the evaporator control is
housed in multiple remote I/O panels that control up to 3
zones each. Up to 10 of the remote I/O panels (30 zones)
can be controlled by one Unity System Controller.
The Quantum HD Unity System Controller is designed with
best refrigeration control practices in mind for the control
of Condensers, Vessels, Evaporators and Engine Room
items such as ventilation and refrigerant detection. There
are many combinations of how the controller can be con-
gured as a result of the numerous options and features.
This manual provides information on the most common/
standard congurations.
Components
• Power supplies - Provide the necessary operating volt-
ages for proper operation of all control Components.
• Ethernet switch - Connects the various controllers to a
network.
• Q6 Processor board - The Q6 processor board is the
principal controller for the Quantum HD Unity System
Controller. There is a Q6 processor board for each of
the following controls:
–Condenser/Vessel
–Evaporator
–Engine Room
• The Q6 processor board runs software that communi-
cates with the analog and digital boards. From the status
of the data pulled from these boards along with the con-
troller conguration, the processor operates the system
by communicating commands to the analog and digital
boards. If operation moves outside of what is deemed
good operation the processor takes appropriate action.
• Digital input/output boards - The digital boards for
condenser, vessel, and engine room control are mount-
ed in the main Unity System Control enclosure. The
digital boards for the evaporator control are mounted
in smaller enclosures that can be mounted where it
makes the installation easier or better ts the mainte-
nance model for the facility.
• Digital on/off signals are sent and received by these
boards. The output modules are used to energize and
de-energize system components as commanded by
the Q6 processor board. The input modules sense the
status of the system components and communicates
that status to the Q6 processor board.
• Additional information on the digital I/O boards is found
in the Digital Board section for each control section
(condenser, vessel, evaporator, and engine room) of
this manual.
• The number of digital inputs and outputs varies from
board to board and from control to control based on
the operation.
• Analog Input / Output Boards - The analog boards
for condenser, vessel, and engine room control are
mounted in the main Unity System Control enclosure.
The analog boards for the evaporator control are
mounted in smaller enclosures that can be mounted
where it makes the installation easier, or better ts the
maintenance model for the facility.
• The analog inputs read pressures, temperatures, levels,
and other analog devices and communicates those
values back to the processor. The processor evaluates
these values to properly control the system.
• The analog outputs are controlled by the processor in
order to maintain the system in proper operating order
based on the status of the analog and digital inputs.
Each analog board has 24 analog input channels and 8
analog output channels.
NOTICE
The components within the control panel can be
inadvertently damaged by static electricity or mis-
handling. Only qualied technicians should directly
handle these components.
Basic troubleshooting
Most problems encountered with the microprocessor and
control circuits are the result of a wiring fault, a blown
fuse, faulty I/O module, or failure of a peripheral control
such as a solenoid coil or a pressure transducer. If a fault
develops in the computer, the probability is that all func-
tions will cease and the display screen will go blank. The
control system consists of an AC (high voltage) side, which
can be either 120 V, or 230 V, and a DC (low voltage) side.
The AC side actuates solenoids, relays, alarms, and other
electromechanical functions. The DC side operates the
computer and its various sensors.
CAUTION
DO NOT attempt to make corrections to the power
supply without shutting off the power to the control
panel. Accidental shorts can irreparably damage the
processor boards or the display screen.
CAUTION
DO NOT HANDLE the panel boards when their cables
are disconnected without rst attaching a properly
grounded wrist ground strap to prevent static electri-
cal discharge from your body.
DANGER
When working within the panel, inadvertent contact
on the AC high voltage side, which can be either
nominal 120 VAC or nominal 230 VAC, CAN CAUSE
INJURY OR DEATH.
