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CTV-PRC007-EN
Controls
Advanced Controls
Trane set the standard for unit
microprocessor controls in 1985 with the
first generation Unit control panel.
Associated with this standard have been:
•
Proportional Integral Derivative (PID)
control strategies which provide stable
operation and higher accuracy for
better performance;
•
Adaptive Control
™
to keep the chiller
on line during adverse operating
conditions and at the same time keep
the chiller from a major failure;
•
Software based safeties that do not
depend on electromechanical
hardware — hardware that means
questionable reliability and added cost;
•
Operator interface that accesses chiller
information and control adjustments at
the front of the panel.
Flexibility
UCP2 adds more flexibility, more
reliability and better system
performance than even our most
demanding customers expect.
•
The modular structure of UCP2 makes
it possible for the designer to select the
system controls and associated
interfaces to Tracer
™
(or other building
automation systems) that are required
for the chiller plant design. With this
modular concept, capability can be
added or upgraded at any time — with
only temporary interruption of chilled
water production.
•
The operator can quickly program his
Custom Report — so that only what is
considered to be the most frequently
accessed/important reports are
available —at any time, right at the
front of the panel.
•
With easy front panel programmability
of Daily, Service Start-up and Machine
Configuration settings and setpoints,
the operator, serviceman, and system
designer can customize the use of the
micro controller to the unique
conditions of the chiller plant —
whether the purpose of chilled water is
for comfort cooling or for process
cooling.
•
All data that is necessary for the safe
operation and easy serviceability of the
chiller is provided as standard on all
CenTraVac
™
chillers. Options are
available that provide additional
controls/data that are required for:
an industrial/process system design,
applications outside of the typical
chilled water system design,
the need for redundant machine
protection, or the desire for more
system information.
•
Equipment room refrigerant ppm
monitoring can be integrated into the
control panel by employing a chiller
mounted monitor or a wall mounted
monitor.
UCP2 is modular in design which offers
the ability to adapt to changes easily and
effectively without adding prohibitive
cost. To provide flexibility, the controller
responds to a wide variety of needs for:
System Designs including equipment,
operating conditions, and controls
variations that are either existing
or being considered for new
installations.
Key to designing non-traditional systems
is the ability to evaluate the cost and
reliability issues of these systems in
comparison to the more traditional
systems. Trane recommends the use of
C.D.S. Network Equipment Economics,
the Trane Applications Manuals, and
consultation with a Trane sales engineer
for help in this analysis.
System Upgrades including the ability to
accommodate changes in the chilled
water system design or equipment room
requirements or to accommodate new
technologies that become available.
Reliability
To most people, reliability means
“dependable — giving the same result
on successive trials.” However, to our
customers it has come to mean “keep
chilled water flowing.” In other words,
“when I turn the switch on —cold water
comes out.” In order to do this, the
micro controller must be aware of what
is happening in the system. But, more
importantly, it must be able to make
decisions and adjustments to keep the
chiller running as long as possible even
when non-standard conditions exist.
Conditions such as bad power or bad
water (flow, temperature, fouling) or
system component failure.
•
With Enhanced Adaptive Control
™
the
controller does everything it can to
avoid taking the chiller off line:
— senses potential overload, freeze
and condenser overpressure
conditions
— displays a warning message about
the potential condition/safety trip
— takes the following corrective action
sequentially as the condition
worsens:
limits loading
prevents further loading
unloads until condition improves
takes chiller off line
•
With the ability to detect surge, UCP2
can call for corrective action to be
taken to prevent a surge failure. If the
system can respond within 15 minutes,
the chiller will continue to operate until
further corrective action can be taken.
•
With the ability to function across a
broader operating map, UCP2, in
conjunction with the multiple-stage
compressor, can provide safe
operation when undesirable inputs to
the chiller are encountered. This
capability includes:
— cold condenser start
— running with hot condenser water
— low condenser water flow
— hot evaporator start
— varying water/fluid loop flow
operation
— return from momentary power
losses in less than one minute
— smart restart inhibit designed to get
the chiller back on line fast
•
With more diagnostics and diagnostic
history that are time/date stamped and
with help messages, the operator or
serviceman can take faster and more
effective corrective action.
•
With the new stepper motor/inlet guide
vane actuator, the same technology
used in the machine tool industry
offers highly reliable and precise inlet
vane control.
Systems Performance
“Chilled Water System” encompasses
many levels of control: Stand-alone
Chiller, Chiller Plant, Applied System,
Central Building Automation System.