Flooded type water cooled screw chiller (PCB Control) MCAC-CTSM-2012-11
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6. Introduction of Major Electric Components
PC Board
Collect all digital quantities and
analog quantities on units as well as
inputs of quantities and touch screen
commands, and realize different
outputs by judgment of procedures to
meet the requirement or normal and
safe running of units.
Touch Screen
Human-Machine
Interface
(HMI)
Communicate with PCB to display
the running status of units, set the
running mode of units and control the
running parameters of units.
Switch Power Supply
Achieve AC220V/DC24V to provide
power supply for touch screen,
And Achieve AC220V/DC12V to
provide power supply for touch
screen,
Time Relay
An element necessary for achieving
compressor contactor star-delta
switchover. The time set above is
defined as the star running time (3 to
6S)
EXV Control Module
Work out the suction superheat in the
running process of compressors
through the temperature sensor
(PT1000) and the pressure sensor
connected to the module, and
regulate the opening of EXV through
the suction superheat to enable units
to run in a stable status of
energy-saving
Thermal Overload
Relay
Heat will be generated when current
passes through a conductor. Heat
effects are different due to different
types of current passing through
thermal sheet metal inside the
thermal relay. When the heat effects
are accumulated to certain degree,
the thermal sheet metal will be
deformed so as to switch off front and
rear parts of the thermal relay forcibly
to achieve the purpose of protection.
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