GEA Grasso User manual

_805011_om_gsc_sp2_gbr_1_.doc 1
Grasso System Control
for two stage Chiller/ Packages with Screw
Compressors
Operating Instructions

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
2 _805011_om_gsc_sp2_gbr_1_.doc
COPYRIGHT
All Rights reserved. No part of this publication may be copied or published by means of printing, photocopying,
microfilm or otherwise without prior written consent of Grasso. This restriction also applies to the corresponding
drawings and diagrams.
LEGAL NOTICE
This publication has been written in good faith. However, Grasso cannot be held responsible, neither for any
errors occurring in this publication nor for their consequences.

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
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SYMBOLS USED IN THIS MANUAL
Danger!
This is an important warning. Non-observance these warnings can cause accidents with relevant
damages on persons or serious damages on the compressor or refrigerating plant.
Warning!
Attention! Caution! Important!
Hint!
Tip! Note!

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
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TABLE OF CONTENTS
1Start-up / Operation of GSC .................................................................................................................. 8
1.1 General Information ................................................................................................................. 8
1.2 Description of the Grasso System Control................................................................................ 8
1.2.1 View............................................................................................................................... 8
1.2.2 Lamps/ Push buttons .................................................................................................. 10
1.2.3 Operator terminal....................................................................................................... 11
1.2.3.1 Key assignment............................................................................................ 12
1.2.3.2 Call up table of contents ............................................................................. 14
1.2.4 Status displays ............................................................................................................. 15
1.3 System description GSC........................................................................................................... 18
1.3.1 Explanation of the system LED................................................................................... 18
1.4 Alarms ..................................................................................................................................... 19
1.4.1 View active alarms and warnings............................................................................... 19
1.4.2 No alarm signal and the compressor will not start.................................................... 19
1.4.3 Restart following Alarms ............................................................................................ 20

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
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TABLE OF FIGURES
fig. 1: View of outside of switchgear cabinet................................................................................................ 8
fig. 2: View of inside of switchgear cabinet .................................................................................................. 9
fig. 3: GSC operator terminal ....................................................................................................................... 11
fig. 4: "Status messages" display................................................................................................................... 15
fig. 5: Restart following Alarms ................................................................................................................... 20

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
8 _805011_om_gsc_sp2_gbr_1_.doc
1 START-UP / OPERATION OF GSC
1.1 General Information
Warning!
Read the ´Operating Instructions´ before starting the screw compressor unit/ chiller.
The ´Operating Instructions´ is an extract from the GSC User Manual, containing the most important
information for the operator.
The indexes are not identical with those of the GSC User Manual. The index [X.X.X.] under the
headings of this operating instruction refers to the matching chapter within the User manual.
For more specific information see GSC User Manual or press the key to obtain more
information about the selected parameter.
The GSC is supplied with text in native language.
1.2 Description of the Grasso System Control
1.2.1 View
[Chapter 1.1.1. in user manual]
fig. 1: View of outside of switchgear cabinet
A HP
B LP
C Warning
D Failure

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
_805011_om_gsc_sp2_gbr_1_.doc 9
fig. 2: View of inside of switchgear cabinet
1 Profibus DP/DP-coppler
2 Bus Terminal
3 Type of Power Supply
4 Emergency stop relay
5 Relays
6 Socket-outlet for service

OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
10 _805011_om_gsc_sp2_gbr_1_.doc
1.2.2 Lamps/ Push buttons
[Chapter 1.1.2. in user manual]
White indicator light (Running HP compressor)
This indicator lamp flashes slowly when the compressor unit is in the “Ready“state.
This lamp flashes quickly during start up of the compressor.
Once the compressor has started, the light becomes steady.
This lamp flashes quickly during the shut down operation, until the compressor drive motor is switched off.
White indicator light (Running LP compressor)
This lamp flashes during start up of the LP-compressor.
This lamp flashes quickly during start up of the compressor.
Once the compressor has started, the light becomes steady.
This lamp flashes quickly during the shut down operation, until the compressor drive motor is switched off.
Yellow indicator light (Warning)
This lamp flashes if an operating condition reaches a preset value (Warning /Pre-alarm).
Detection of this warning can be acknowledged at the operator panel. Warnings are automatically reset after the
cause has gone.
The flashing light changes over to a steady light.
This indicator light switches off again when the operating conditions are back to normal.
Red indicator light (Alarm)
This lamp flashes if an operating condition exceeds its permitted value, the machine shuts down on alarm.
This state is signalled by a red flashing light. After the alarm has been acknowledged at the operator panel, this
flashing light changes over to a steady light, as long as the alarm condition remains.
Once the cause of the alarm has been corrected, this indicator light switches off (after it has been acknowledged).
Emergency Stop button
This red button can be used to switch the compressor unit off at any time in case of an emergency. The operator
terminal controls remain functional.