GEA Grasso Manuel utilisateur

Refri

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

eration Division

GRASSO SYSTEM CONTROL

01.2003/ 0 638660E_contents.doc - 1/1

FOREWORD

DESCRIPTION OF GRASSO SYSTEM CONTROL 1

CONTROL SEQUENCE 2

INITIAL START UP3

SYSTEM DESCRIPTION 4

TECHNICAL DATA 5

ALARMS 6

TROUBLESHOOTING 7

SERVICE 8

APPENDICES 9

Grasso

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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

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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

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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