60
HDWA-SVX001D-EN
Limit Conditions
The UC800 will automatically limit certain operating
parameters during startup and run modes to maintain
optimum chiller performance and prevent nuisance
diagnostic trips. These limit conditions are noted in the
following table.
Table 15. Limit conditions
Condition
Description
Running - Limit
The chiller, circuit, and compressor are currently running, but the operation of the chiller/compressor is being actively
limited by the controls. Further information is provided by the sub-mode.
Condenser Pressure
Limit
The circuit is experiencing condenser pressures at or near the condenser limit setting. The compressor will be unloaded to
prevent exceeding the limits.
Evaporator
Refrigerant
Temperature Limit
The circuit is experiencing saturated evaporator temperatures at or near the Low Refrigerant Temperature Cutout setting.
The compressors will be unloaded to prevent tripping.
Current Limit
The compressor is running and its capacity is being limited by high currents. The current limit setting is 100% RLA (to avoid
overcurrent trips).
AFD Heat Sink
Temperature Limit
This limit will unload the chiller if the communicated heat sink temperature approaches cutout.
Demand Limit
This limit allows the customer to control the maximum power into the chiller.
Control Panel Devices and Unit-
Mounted Devices
Unit Control Panel
Safety and operating controls are housed in the unit
control paneland the starter panel. The control panel
operator interface is called Tracer® AdaptiView™ and
is located on an adjustable arm connected to the side
of the control panel. For more information about
operating Tracer® AdaptiView™, refer to Tracer
AdaptiView Display for Water-cooled Agility Chillers
Operations Guide (HDWA-SVU001*-EN).
The control panel houses several other controls
modules called panel-mounted Low Level Intelligent
Devices (LLIDs), power supply, terminal block, fuse,
circuit breakers, and transformer. The inter-processor
communication (IPC) bus allows the communications
between LLIDs and the UC800. Unit-mounted devices
are called frame-mounted LLIDs and can be
temperature sensors or pressure transducers. The
MODBUS® master connection on the UC800 provides
communication to the TR200 AFD and to the Magnetic
Bearing Controller (MBC). These and other functional
switches provide analog and binary inputs to the
control system.
User-defined Language Support
Tracer® AdaptiView™ is capable of displaying English
text or any of 26 other languages (27 total languages).
Switching languages is simply accomplished from a
Language Settings menu. The following languages are
available:
• Arabic (Gulf Regions)
• Chinese—China
• Chinese—Taiwan
• Czech
• Dutch
• English
• French
• French (Canada)
• German
• Greek
• Hebrew
• Hungarian
• Indonesian
• Italian
• Japanese
• Korean
• Norwegian
• Polish
• Portuguese (Portugal)
• Portuguese (Brazil)
• Russian
• Romanian
• Spanish (Europe)
• Spanish (Latin America)
• Swedish
• Thai
• Turkish
SSttaarrtt--uupp aanndd SShhuutt--ddoowwnn
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