Controller; Fittings; Fig. 27 Gea Grasso M-Series, Arrangement Of The Controller - GEA Grasso M-Series Operating Manual

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
7.7.9

Controller

fig.27: GEA Grasso M-Series, arrangement of the controller
The screw compressor package is equipped with a
GEA Omni™-type controller.
The GEA Omni consists of the control unit with oper-
ator keypad and display unit, indicator lights for
"Running", "Warning" and "Alarm", the emergency
stop button, the output relays and the casing.
The GEA Omni is mounted directly on the package
as standard. As an option, the GEA Omni can be
installed in a control centre.
The GEA Omni performs the following functions
as standard:
• Display of all important physical and technical
parameters, e.g. Pressure, temperature, motor
current, capacity, number of operating hours,
operating mode and status signals
• Automatic start up and shut down of the screw
compressor package and capacity control
dependent on the suction pressure or an exter-
nal temperature,
•
Monitoring of all operating parameters
• Compressor capacity limitation, in case the
measured discharge pressure, suction pressure,
secondary refrigerant temperature or motor cur-
rent indicate overload
•
Fault memory with date and time
•
Wire failure detection for all analogue input sig-
nals
•
Password protection for preventing unauthorised
access to important parameters
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
• Non-volatile saving of program
• Possibility of communication with master control-
ler via MPI
(optionally via Profibus-DP, Modbus RTU or
Modbus TCP)
Hint!
The documentation of the controller
(operating manual, circuit diagram,
parameter list, communication guide-
line) forms part of the product docu-
mentation.
7.7.10

Fittings

The term fitting generally designates a control ele-
ment of the machine. Among other things, the term
fitting is also used for valves if these are used for the
control and regulation of fluid flows in the piping.
Furthermore, all kinds of installations in piping, such
as sight glasses, measurement apertures, filters and
similar are also designated as fittings. Therefore, fit-
tings also include all kinds of valves, such as:
–
Stop valves
– Check valves
– Safety valves
– Throttle valves
Each fitting has its own field of use, according to the
pressure or temperature in the pipe, the size of the
pipe, the sealing requirements for the fitting, the
reduction and direction of the flow of liquid as well as
the medium itself.
The safety fittings are used to limit the pressure in
systems which are under pressure.
Each fitting is designed for the specific application.
The fittings can be operated manually or by motor,by
gear motors, or pneumatic or hydraulic cylinders, for
example. In reset fittings, the flow of fluid in the pipe
causes automatic closing of the valve.
Depending on the model, different closing elements
(e.g.valve discs, flaps, pushers) close the pipe con-
nected to the fitting.
Hint!
The documentation of the fittings
(acceptance certificates) forms part of
the product documentation.
Description of Design and Function
43