Setting Of Setpoint And Limiting Values As Well As Safety Devices; Operation Of The Screw Compressor Package; Instructions Regarding Failures, Their Causes And Remedies - GEA Grasso M-Series Operating Manual

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
9.3.2 Setting of setpoint and limiting
values as well as safety devices
Caution!
The correct setting of all setpoint and
limiting values is a prerequisite for the
safe operation of the SCP.
For the setting of the setpoint and limiting values, the
1. details (steps) in the control operating manual
and
2. the project-related data are
instrumental. The program-based setpoint and limit-
ing values as well as the setting values of the safety
device are stated in the project-based parameter
list. The parameter list forms part of the documenta-
tion for the controller.
9.4 Operation of the screw compressor
package
Caution!
Read the control documentation care-
fully.
Contact the GEA Refrigeration Ger-
many GmbH technical customer serv-
ice if you require assistance.
The screw compressor package is operated using
the control (standard: GEA Omni).
The GEA Omni is mounted directly on the screw
compressor package as standard, but can also be
arranged in a control centre.
The GEA Omni consists of the control unit with oper-
ator keypad and display unit (TouchPanel), indicator
lights for "Running", "Warning" and "Alarm", the
emergency stop button, the output relays and the
casing.
All switching, operating and control actions are car-
ried out via this TouchPanel. The TouchPanel is the
interface between the man and the machine.
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
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 com-
pressor package and capacity control dependent
on the relevant parameter for the application
(e.g. the suction pressure or an external temper-
ature),
– Monitoring of all operating parameters,
– Compressor capacity limitation if the measured
discharge pressure, suction pressure, secondary
refrigerant temperature or motor current indicate
an 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
– Non-volatile saving of programme,
– MPI communication with a master controller
(optionally via Profibus-DP, Modbus RTU or
Modbus TCP).
9.5 Instructions regarding failures, their
causes and remedies
The screw compressor packages/ chillers manufac-
tured by GEA Refrigeration Germany GmbH are
highly advanced, automatic and extremely efficient
systems. Nevertheless, faults can occur and may
complicate any continuous operation of the plant or
cause a failure of a part or the entire plant.
Use, operation, control
69