Control; Control Flow Chart - Midea LSBLG MCF Series Technical & Service Manual

MCAC-CTSM-2018-1
III. Control
1.

Control flow chart

380VAC
3P+N+PE
Miniature
Circuit
Breaker
HMI
Main base controller gathers signals through input terminals, such as pressure,
temperature and the state of protection switches and ensures unit's current
condition. At the same time, according to input signal from HMI, such as starting
signal, controller performs the logical operations and outputs signals. These
signals act on components, time relay, contactors and so on.
HMI+ Main base controller:
2 Compressors
Double-Head
Compressor
Thermo relay
Compressor
Contactor
Star-Delta Start
Main base controller
Terminal for
External Signal
e.g. Temp.
Pressure
27
Flooded type water cooled screw chiller (MIC)
M
~
Compressor
Thermo relay
Star-Delta Start
M
~
Compressor
Contactor
Terminal for
Output Action
e.g. Solenoid
Valve