GEA Grasso Manual de usuario
Refri
g
eration Division Grasso
2003/0 638660_um_gsc_gbr
GRASSO SYSTEM CONTROL
Standard Package with Piston Compressors
Single Stage and Two Stage
Manual
Copyright Grasso GmbH Refrigeration Technology
The contents of this documentation and the enclosed drawings, sketches and diagrams are intended only for plant
users and operating personnel. They may be neither duplicated nor divulged to third parties or firms without
written consent.
The technical data, figures, dimensions and weights presented in the documentation may be more closely defined
or otherwise specified as a result of contractual agreement and are binding only after our confirmation in writing.
The stipulations set forth in the contract have precedence over those in this documentation.
We reserve all rights to introduce technical modifications in the course of further development.
Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
01.2003/ 0 638660E_foreword.doc Foreword - 1
FOREWORD
Introduction
Grasso has been producing refrigerating compressors and compressor units for a wide range of different
applications for several decades.
A new compressor control has been developed for universal use based on our many years’ operational
experience.
The compressor control, type “GSC“ (Grasso System Control) is a highly modern programmable controller, which
is based on the Simatic C7-633 system.
The GSC is suitable for controlling and monitoring our company’s compressors.
Explanation of the abbreviations used
The following abbreviations are used in this manual.
Abbreviation Description
GSC “Grasso System Control“ Type designation of the Grasso standard compressor control
CP “Communication processor“
CPU “Central processing unit“
DP “Decentralised periphery“
Eco “Economizer“
EPROM “Erasable programmable read-only memory“
Ext. “External“
RF „Refrigerant“
RF-separator “Refrigerant separator“
LED “Light-emitting diode“
MAX “Maximum“
MIN “Minimum“
MPI „Multi Point Interface“ Siemens internal, interface with multi-point capability on the GSC,
used for communication between several controls.
MRES „Memory Reset“
SV „Solenoid valve“
LVS “Low Voltage switchgear“ — switchgear with power contactors for compressor motor, oil
pump and oil heating
OP “Operator panel“ control and display device
PG “Programming device“
PLC “Programmable logic controller“
P & ID “Pipe and instrumentation diagram“
General drawings
This drawing shows the general configuration of a piston compressor unit type “Grasso6210“ with economiser.
The supplied model can deviate from this.
Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
Foreword - 2 638660E_foreword.doc 01.2003/ 0
Figure 0.1: View of piston compressor unit, type Grasso6210 with economiser
oil separator
piston compressor
GSC
drive motor
suction side stop valve
coupling
terminal box
economiser
discharge side stop valve
Grasso
Refri
g
eration Division
GRASSO SYSTEM CONTROL
01.2003/ 0 638660E_foreword.doc Foreword - 3
General P & ID
This diagram is intended to give a general overview of the measuring points provided. The supplied unit may
deviate from this diagram.
MAIN SWITCHGEAR CABINET MAIN SWITCHGEAR CABINET
Input signals Additional output signals
Motor feedback
Motor thermal protection Start motor
Emergency Stop Start oil pump
External ‘ON’ Ready
External ‘LESS’ Running
External ‘MORE’ No alarms
Start release
External reset
Liquid level switch
Gas sensor
Setpoint switch
Figure 0.2: P & ID
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