ECKELMANN VS 3010 BS User manual

Operating instruction
VS 3010 BS Pack Controller
For booster / satellite systems
July 2018, 1.02 - Firmware V5.06

KGL Operating Manual – VS 3010 BS 2018-07-02 /2 178
Eckelmann AG
Business Unit Refrigeration and Building Automation
Berliner Straße 161
65205 Wiesbaden, Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.eckelmann.de
Board of Management:
Dipl.-Ing. Peter Frankenbach, Spokesman,
Dipl.-Wirtsch.-Ing. Philipp Eckelmann, Dr.-Ing. Marco Münchhof, Dr.-Ing. Frank Uhlemann
Chairman of the Supervisory Board: Hubertus G. Krossa
Deputy Chairman of the Supervisory Board: Dr.-Ing. Gerd Eckelmann
Registration court / registration number
District court Wiesbaden, HRB 12636
Before commissioning and use, please check that this is the latest version of the document. With the
publication of a new version of the documentation, all previous versions lose their validity.
Errors and technical modifications are expressly reserved.
The current operating manual and information such as data sheets, more detailed documentation and FAQs
are available for you on-line in E°EDP (Eckelmann ° Electronic Documentation Platform) at
www.eckelmann.de/elds
You reach all relevant documents for this component directly using the QR code:
Information on safety and connection instructions are described in detail in chapter ”Industrial safety notes”.
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the Eckelmann AG company.
In particular, neither the contract partners of Eckelmann AG nor other users have the right to distribute or
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some extent, names of products/goods or designations are protected for the respective manufacturer
(registered trademarks etc.); in any case, no guarantee is assumed for their free availability/permission to use
them. The information provided in the description is given independently of any existing patent protection or
other third-party rights.

KGL Operating Manual – VS 3010 BS 2018-07-02 /3 178
Table of Contents
1 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.1 Explanation of 'General Note' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2 Explanation of 'Safety Instructions and Hazard Warnings' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Warning Signs and Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.4.1 Exclusion of liability for non-observance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4.2 Requirements for the personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.4.3 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.4.4 Five safety rules according to BGV A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.4.5 Electrostatic sensitive components and control components (ESD) . . . . . . . . . . . . . . . . . . . . . . 13
1.4.5.1 ESD - guidelines for handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.4.6 Abbreviations used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2 System design VS 3010 BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 VS 3010 BS Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 VS 3010 BS Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Starting characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1 First start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.2 Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 System expansion options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Configuration of the pressure transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.4 Low-pressure Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.1 Control algorithm for LP control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.2 Control algorithm with LP step controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.2.1 Neutral zone with compressor step control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.2.2 Compressor control times for compressor step regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.3 Control algorithm with LP combined control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.3.1 Loading / unloading of fixed-speed compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.3.2 Loading / unloading of fixed-speed compressors during operation with capacity-controlled
compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.4.3.3 Compressor control times for compressor combined control . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4.4 Capacity-controlled compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.4.1 Inversion of the compressor capacity stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.5 Base load rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.5.1 Base load rotation for speed controlled compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.6 Control of Z2 compressors via consumer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.7 Compressor packs with suction gas bypass (evaporation pressure regulator) . . . . . . . . . . . . . . 35
4.4.8 Setpoint shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.4.8.1 Setpoint shift via room temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.8.2 Setpoint shift - demand-dependent via Z1/Z2 consumer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.8.3 Setpoint adjustment via humidity sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.4.8.4 to-Z1 setpoint shift with cascade regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.4.9 Load shedding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.5 High-pressure / condenser regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5.1 Neutral zone fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

KGL Operating Manual – VS 3010 BS 2018-07-02 /4 178
4.5.1 Neutral zone fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5.2 Control algorithm for fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5.3 Control algorithm with step controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5.4 Star-delta switching of the fan motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.5.5 Parametrisation of the switching modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.5.6 Regulation of the fan speed with continuous control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.5.7 Control algorithm for parallel combined control type of control . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.5.8 Control algorithm for combined control - stages type of control . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.5.9 Setpoint calculation tc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.5.9.1 Setpoint calculation in normal operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.5.10 Condenser fan control times with step controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.5.11 Protection and base load rotation of the fan motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.6 Cascade regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.6.1 Control of the cascade by the VS 3010 BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.6.1.1 Parametrisation of HP-Z2 transducer characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.6.1.2 Z2 high-pressure / refrigerant Z2 measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.6.1.3 Cascade regulation control algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.6.1.4 Continuous temperature control using condensation temperature Z2 . . . . . . . . . . . . . . . . . . . 56
4.6.1.5 Continuous superheat regulation using the evaporating temperature Z1 . . . . . . . . . . . . . . . . 57
4.6.1.6 Valve control – output of the opening degree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.6.1.7 Output of the opening degree for single-valve operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.6.1.8 Output of the opening degree for tandem operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.6.1.9 Limiting the opening degree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.6.1.10 Fixed opening degree for service purposes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6.1.11 Emergency Op. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6.1.12 Manual Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6.1.13 Cascade disabling refrigeration points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6.1.14 Alarm due to implausible opening degree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.6.2 Control of the cascade by a case controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.7 Heat recovery mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.7.1 Setpoint calculation in HR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.8 Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.8.1 Safety loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.8.1.1 Monitoring of low oil pressure switch / compressor high-pressure cutout . . . . . . . . . . . . . . . . 62
4.8.1.2 Monitoring of the compressor motor overload cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.8.2 Compressor cylinder head temperature Z1/Z2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.8.3 Automatic high prioritisation for compressor fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.8.4 Monitoring of the Z1/Z2 compressor speed controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.8.5 Monitoring of the starts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.8.6 Low-pressure monitoring Z1/Z2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4.8.7 Z1/Z2 minimum suction gas superheat monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4.8.8 Monitoring of tc/t0 difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.8.9 High-pressure monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.8.9.1 High-pressure monitoring in satellite or booster operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.8.9.2 High-pressure monitoring in booster or cascade operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.8.9.3 Reduction of the compressor speed in the event of high HP . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4.8.10 Monitoring of the fan motor overload cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.8.11 Monitoring of the fan speed controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.8.12 External alarm monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.8.13 Liquid level in the collection tank monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.8.14 Monitoring of the fast unload / External Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.8.15 Burst disk monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

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4.8.15 Burst disk monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.9 Toggle setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.10 Ambient data for the setpoint shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.11 Disabling of refrigeration points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.12 COP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.12.1 COP optimisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.13 Operating data and archiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.13.1 Operating hours of compressors and fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.13.2 Daily run times, compressor starts and activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.13.3 Actual value archives for the graphical display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.14 Refrigeration compressor packs with oil equaliser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.15 Discharge gas defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.15.1 Parametrisation of the discharge gas defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.15.2 Actual values for the discharge gas defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4.15.3 Manual control of the D2D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4.15.4 Course of the common discharge gas defrosting Z2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.15.5 Sequence of the discharge gas defrosting of Z2 cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.15.6 Sequence of the discharge gas defrosting of Z2 cold rooms . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.15.7 Course of the discharge gas defrosting Z1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.15.8 Course of the Z2 discharge gas defrost when the type of defrosting is set to "Cold rooms - El.
UA" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
4.15.9 Error during discharge gas defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5 VS 3010 BS Installation and start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.1 DIN rail mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.2 Default hardware settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.2.1 SIOX extension module - for DIN rail mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
5.2.1.1 Connection of the SIOX modules to the pack controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
5.2.2 Default settings with S1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
5.2.3 Setting the CAN bus address with S2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
5.2.4 Setting of the interface RS485/TTY using jumper J1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
5.2.5 Configuration of the analogue inputs and outputs at the factory . . . . . . . . . . . . . . . . . . . . . . . . . 90
5.2.6 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
5.2.6.1 Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
5.3 Default parameter settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
5.4 Start-up of speed-controlled condenser fans / compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
5.4.1 Procedure for the start-up of a system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
5.5 Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
5.6 Firmware Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
5.6.1 Requirements for firmware update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.6.2 Update of the current firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
6 VS 3010 BS connection and terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
6.1 Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
6.1.1 Pin assignments VS 3010 BS base module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
6.1.2 Pin assignments for SIOX extension module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
6.2 Terminal diagrams for base module and SIOX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
6.2.1 Terminal assignment of the 230 V AC power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
6.2.2 Terminal assignment of the digital inputs - 230 V AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

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6.2.2 Terminal assignment of the digital inputs - 230 V AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
6.2.3 Terminal assignment of the relay outputs - 230 V AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
6.2.4 Terminal assignment of the analogue inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
6.2.5 Terminal assignment of the analogue outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
6.2.6 Terminal assignment of CAN bus, SIOX and Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
6.2.7 D2D – SIOX extension module for discharge gas defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
6.2.7.1 D2D - Terminal assignment of the 230 V AC digital inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 115
6.2.7.2 D2D - Terminal assignment of the 230 V AC relay outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 116
7 VS 3010 BS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
7.1 Manual / automatic emergency mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
7.2 Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
7.3 Display of the operating states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
8 VS 3010 BS operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.1 Operation possibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2 Remote control using a terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.1 Menus and operating screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
8.2.2 Call controller menu using remote operation, page 115 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
8.2.2.1 CI 4x00 System Centre - Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
8.2.2.2 CI 3x00 store computer / AL 300 operator terminal - remote control . . . . . . . . . . . . . . . . . . . 126
8.2.3 Cancelling entry block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
8.2.3.1 CI 4x00 system centre - login and logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
8.2.3.2 CI 3x00 store computer / AL 300 operator terminal - unlock . . . . . . . . . . . . . . . . . . . . . . . . . 128
8.2.4 Activating service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
8.2.4.1 CI 4x00 system centre service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
8.2.4.2 CI 3x00 store computer - service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
9 VS 3010 BS menu structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
9.1 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
9.1.1 Main menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
9.1.2 Menu 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
9.1.3 Menu 2 Actual values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
9.1.4 Menu 3 Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
9.1.5 Menu 4 Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
9.1.6 Menu 5 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
9.1.7 Menu 6 Operating data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
9.1.8 Menu 7 Default settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
9.1.9 Menu 8 Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
10 Decommissioning and disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
10.1 Decommissioning / Dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
10.2 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
11 Alarms and messages VS 3010 BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
11.1 Message system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
11.2 Structure of the messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
11.2.1 Automatic Prioritisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
11.3 Overview of all alarms and messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
12 Technical Data VS 3010 BS / SIOX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

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12.1 Electrical Data VS 3010 BS / SIOX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
12.2 Mechanical Data VS 3010 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
12.3 Mechanical Data SIOX Extension Module With manual control switch . . . . . . . . . . . . . . . . . . . . . . . 177
13 Part numbers and accessories VS 3010 BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
13.1 Pack controller VS 3010 BS / SIOX extension module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
13.2 Accessories for VS 3010 BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

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1.
2.
1.
2.
3.
4.
1.
2.
1 Conventions
1.1 Explanation of 'General Note'
A general note consists of two elements:
A pictogram of a hand at the edge of the page and
the actual note text:
For example:
Further information for the protection rating of the device is contained in the chapter Technical Data
.VS 3010 BS / SIOX, page 175
1.2 Explanation of 'Safety Instructions and Hazard Warnings'
Safety instructions or hazard warnings are composed of four elements:
The pictogram (warning sign / symbol) at the edge of the page.
A short, concise description of the danger.
A description of the possible consequences.
A catalogue with measures for avoidance.
For example:
Warning about dangerous electrical voltage! Danger of electric shock! BEFOREconnecting and
disconnecting, it must be checked that at the 230 V AC relay outputs!no voltage is present
The warning signs and symbols used for the safety instructions and hazard warnings in this documentation are
described in detail on the following page.
1.3 Warning Signs and Symbols Used
Explanation of the warning signs and symbols used for the safety instructions and hazard warnings in this
documentation:
Attention symbol - general hazard warning
Hazard warning
The attention symbol indicates all safety instructions in this operating and service manual
which result in danger to life and limb if not observed. Carefully comply with the work safety
instructions and proceed with particular caution in these cases.
Attention
The attention symbol highlights guidelines and regulations, instructions and correct working
procedures that must be particularly observed in order to prevent damage to and destruction
of LDS components or malfunctioning (for example to prevent stock loss).
Failure to observe the attention symbol can result in personal injury (in extreme cases serious injuries or

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Failure to observe the attention symbol can result in personal injury (in extreme cases serious injuries or
death) and/or damage to property!
Voltage symbol – warns about hazardous electrical voltage

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Voltage symbol – warns about hazardous electrical voltage
This work safety symbol warns about hazards from dangerous electrical voltage with possible
consequences of serious injuries and death.
ESD symbol - Warning about electrostatic sensitive components and control components
This symbol indicates electrostatic sensitive components and control components; for details see
chapter Electrostatic sensitive components and control components (ESD), page 13
Note symbol
The note symbol highlights usage tips and other useful information contained in this operating and
service manual.
Battery disposal symbol
Never dispose of this product with other domestic waste.
Please inform yourself about the local regulations for the separated disposal of electrical and electronic products.
The correct disposal of your old equipment protects the environment and people against possible negative consequences. Further
information can be found in the chapter "Decommissioning and Disposal".
1.4 Safety Information
The safety regulations, instructions and information described in this chapter must be strictly
observed and complied with. During repairs on the entire E*LDS system, the accident prevention
regulations and general safety regulations must be strictly complied with. Important information
(safety instructions and hazard warnings) is indicated by appropriate symbols (see chapter
). Follow these instructions in order to prevent accidents and danger to life Conventions, page 8
and limb, as well as damage to the E*LDS system.
Warning about dangerous electrical voltage! Danger of electric shock! Beware of external voltage at
the digital inputs and outputs! All device connections/male connectors must only be plugged in,
unplugged and/or wired when .no voltage is present
This operating manual is part of the equipment. It be kept in the vicinity of the controller as well as must
for future use so that it can be consulted when required. The operating manual must be available for the
operating and maintenance personnel for the avoidance of operating errors, see chapter at any time
.Explanation of 'safety instructions and hazard warnings', page 8
For safety reasons, the equipment must not be used for any applications other than described in the
operating manual and only for the intended use, see chapter Warning Signs and Symbols Used, page
.8
Before using the device, check whether it is suitable for your application with regard to its limit values.
Before connecting the device, it must be checked whether the power supply is suitable for the device.

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1.
2.
Before connecting the device, it must be checked whether the power supply is suitable for the device.
When using uncoded plug connectors, it is possible to connect them so that there is a danger to life and
limb! If this cannot be ruled out, coded plug connectors must be used.
Specified environmental conditions (e.g. humidity and temperature limits) must be observed and
complied with. Otherwise, malfunctions are possible (see chapter Technical Data VS 3010 BS / SIOX,
).page 175
Before switching on the device, check correct wiring of the connections.
The device must never be operated without its case. Before opening the case, the device must be
disconnected from the power supply.
Note the maximum load of the relay contacts (see chapter Technical Data VS 3010 BS / SIOX, page 175
).
Contact the supplier in the case of any malfunction.
According to experience, transmission of alarms is not yet functional during commissioning (no
telephone line laid etc.). It is strongly recommended in such cases to monitor the controller via
the CAN bus using a system centre or an operator terminal and to enable transmission of
alarms using a GSM modem via a mobile telephone system. In standalone operation, or as an
alternative to monitoring with system centre / operator terminal, an available alarm contact on
the controller must be used to realise transmission of alarms via a telephone network.
After the setting up of transmission of alarms or alarm signalling, this must be tested and
function.checked for its
For further information about the CAN bus, see the operating instruction "Basic and General Safety
and Connection Notes".
Work on the electrical system may (according only be performed by authorised specialist personnel
to the definition for specialists in DIN/VDE 0105 and IEC364, see chapter Explanation of 'safety
) and in accordance with the respective applicableinstructions and hazard warnings', page 8
VDE regulations
Local safety regulations
Intended use; see chapter Warning Signs and Symbols Used, page 8
Five safety rules according to chapter BGV A3, see Five safety rules according to BGV A3,
page 12
ESD measures, see chapter Electrostatic sensitive components and control components (ESD)
., page 13
Operating instructions
1.4.1 Exclusion of liability for non-observance
This operating manual contains information about the commissioning, function, operation and maintenance of
the controller and the associated components.

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A basic requirement for safe and trouble-free operation is .compliance with this operating manual
1.4.2 Requirements for the personnel
Special technical knowledge is required for planning, programming, installation, putting into service and
maintenance work. This work may only be performed by trained or specially trained personnel. The installation,
putting into service and maintenance personnel must have training which authorises interventions in the
system and the automation system. The planning and programming personnel must be familiar with the safety
concepts of automation technology. Specialist knowledge is required for work on electrical systems. Work on
electrical systems may only be carried out by qualified electricians or persons under their guidance or
supervision. In doing so, the respective applicable regulations (e.g. DIN EN 60204, EN 5017 DIN 8, BGV A3,
VDE 0100/0113) must be observed. The operating personnel must be instructed in handling the system /
machine and the controller and must be familiar with the operating instructions.
1.4.3 Intended Use
This controller has been designed exclusively for the intended use:
The VS 3010 BS controller is designed for use as pack controller in commercial and industrial refrigeration
facilities in accordance with the scope of functions and in accordance with the environmental conditions
described in this operating manual.
. Start Note the safety instructions and the instructions for installation and start-up, operation and maintenance
the commissioning and/or operation of the machine / system AFTERWARDS.
The safety and the function of the machine / system are only fulfilled with this intended use.
Never use the machine / system, its components, control components or parts for any other purpose.
The system must not be put into operation until conformity with the applicable EU Directives has been
established for the entire installation.
1.4.4 Five safety rules according to BGV A3
The following rules .must be strictly observed
1. Disconnect: The entire system to be worked on must be disconnected from the power supply at all poles.
Warning about dangerous electrical voltage! Pay attention to possible external power supply!
connecting and disconnecting it must be checked that at the BEFORE no voltage is present
controller! All device connections / connectors may only be plugged in, unplugged and/or wired when
no voltage is present.
2. Secure against restarting: Attach information signs to the disconnected operating equipment stating:
What has been disconnected.
Reason for the disconnection.
Name of the person who made the disconnection.
Restarting must be prevented using a suitable lock (e.g. padlock).
3. Establish absence of voltage (only by authorised specialist personnel):
Check voltmeter just before use.

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Check voltmeter just before use.
Establish absence of voltage on all poles at the disconnection point.
Establish absence of voltage on all poles at the place of work.
4. Ground and short-circuit: All electrical parts at the place of work must be grounded and then short-circuited.
5. Cover or shield live parts: If there is neighbouring live equipment in the work area, this must be covered
using appropriate materials (e.g. insulation blankets / insulating plates).
1.4.5 Electrostatic sensitive components and control components (ESD)
Electronic components and control components (e.g. circuit boards) are sensitive to electrostatic
charges. Therefore, the guidelines for handling electrostatic sensitive components and control
components must be strictly observed, see chapter 1.5.1.
All electrostatic sensitive components and control components (referred to as "ESD" below) are labelled with
the warning sign shown. Electrostatic charges arise from friction of insulating materials (e.g. floor covering,
items of clothing made of synthetic fibres etc.). Even small charges can result in damage to or destruction of
components. Damage cannot always be established directly, but partially does not result in failure until after a
certain operating time.
1.4.5.1 ESD - guidelines for handling
Only transport and store ESD in the protective packaging provided for this.
materials that can produce electrostatic charge such asAvoid
plastic containers and tabletops
synthetic clothing
footwear with plastic soles
transparent covers
polystyrene packaging
monitors etc.
Wear
work clothing made of cotton
ESD footwear with electrically conductive soles or leather soles
Use
conductive floors
ESD work places with the tools provided for them (earthed soldering irons, earthing wrist strap and
similar)
conductive ESD bags, conductive plastic containers, IC rods or cartons with conductive foam
containers and worktops made of wood, metal, conductive plastics or paper bags.

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1.4.6 Abbreviations used
DIN eutsches nstitut für ormung e. V.D I N
EGB lektrostatisch efährdete auelemente oder BaugruppenE G B
ESD lectro- tatic ischarge ( lectro ensitive evices)E s d E S D
VDE erband er lektrotechnik lektronik Informationstechnik e.V.V d E E
IEC nternational lectric ommitteeI E C
BGV A3 m loyers Liability ssociation regulations for health and safety in the workplaceE p A

KGL Operating Manual – VS 3010 BS 2018-07-02 /15 178
2 System design VS 3010 BS
The base module of the pack controller consists of an analogue module and a digital input/output module.
The controller is a modular design and can be extended with a maximum of 3 SIOX extension modules, see
picture. The following expansion stages are possible:
The device configuration and terminal assignment of the pack controller can be found in the chapter VS 3010
.BS connection and terminal assignment, page 105
VS 3010 BS Base Module
Digital inputs
23 x input 230 V AC
Relay outputs
6 x normally open contact 230 V AC
4 x changeover contact 230 V AC
Manual control switch
For manual override
Analogue Inputs / Outputs
2 x input Pt1000 - 4-wire Pt1000 temperature sensor connection (room and outdoor temperature)
13 x input Pt1000 - 2-wire Pt1000 temperature sensor connection (e.g. cylinder head temperature)
7 x input / 4..20 mA (0..10 V) - e.g. pressure transducer connection
4 x output / 0..10 V (4..20 mA) - e.g. connection for continuous compressor / condenser control
SIOX Supply - power supply for SIOX extension module
Interfaces

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CAN bus: communication in the E*LDS system
RS232: E*LDS system communication with building management system and firmware update
possibility
RS485 with integrated 120 Ohm resistor (from serial number >= " ") 14xxxxx - for future functions
SIOX OUT: connection for data transfer to the SIOX extension modules
TTY: communication for the LDS1 system
SIOX extension module
Digital inputs
12 x input 230 V AC
Relay outputs
4 x normally open contact 230 V AC
4 x changeover contact 230 V AC
Manual control switch
For manual override, see chapter Emergency operation manual-automatic mode selection., page 118
SIOX Supply – power supply
Interfaces
SIOX IN: connection for data transfer to the base module
SIOX OUT: Connection for data transfer to further extension modules

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3 VS 3010 BS Functions
The pack controller includes the following functions for the refrigeration compressor pack and condenser:
Control functions
Regulation functions
Notification and archiving of faults
Monitoring functions
Archiving of messages and operating data
These functions include the following:
Compressor control for 2 temperature zones with up to
4 compressors each with 2 capacity stages or
2 compressors each with 3 capacity stages or
8 single-stage compressors in booster or satellite operation
Low-pressure control / compressor control
as step controller
as combined control
Base load rotation
Load shedding
Fan control (step controller) for one-circuit systems with max.
8 directly controlled fans
Regulation of the condenser temperature / fan control
as step controller
as speed controller
combined control - parallel
combined control - stages
Fan protection
The fans are controlled via relay outputs
Monitoringfunctions
Safety loop
- Low oil pressure switch compressor
- Motor overload cutout
- Compressor
- Fan
Cylinder head temperature
Low-pressure
Compressor high-pressure cutout
Minimum suction gas superheat
High-pressure (condenser control)
Compressor speed controller LP-Z1 / LP-Z2
Liquid level in the collection tank
External alarm

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External alarm
Compressor starts
Minimum superheat Z1/Z2
Compressor speed controller LP-Z1 / LP-Z2
Refrigerant level control
Burst disk
Data archiving
Messages
Starts
Run times / operating hours
Utilisation / activity
Cascade regulation
Regulation of a cascade system with continuous expansion valve(s)
Discharge gas defrosting
D2D two-pipe system

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1.
2.
3.
4.
5.
6.
4 VS 3010 BS Function
4.1 Starting characteristics
The following are distinguished for any start-up of the controller:
First start
Restart
4.1.1 First start
The controller is reset to the factory settings during a first start.
The configuration of the controller using the LDSWin must be backed up before any first start
software! All variables in battery backed-up RAM are specifically set to 0 during any first start.
The first start is initiated in the following ways:
Predefined parameters are loaded by the controller when first switching on the system (i.e. after a first
start)
After a firmware update.
If the controller has established using an internal check that no correct parametrisation is available.
After the switching (adjustment) using the coding switches of the DIP switch S1:
Execution of a desired first start
The configuration of the controller using the LDSWin software!must be backed up before any first start
Put coding switch 2 of the DIP switch S1 in a different position:
For details, see chapter .VS 3010 BS Installation and start-up, page 84
Switch off controller for 5 seconds and then switch on again.
Put coding switch 2 of the DIP switch S1 back in the original position.
Switch off controller and switch on again.
Restore the configuration of the controller using the LDSWin software.
4.1.2 Restart
The restart is always performed after restore of the power supply if the parametrisation has been preserved.
All variables (except the parameters) of the fault memory and all archive data are deleted.

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4.2 System Configuration
The VS 3010 BS pack controller has two low-pressure control loops (LP, compressor control) and a high-
pressure control loop (HP, condenser control). Two different temperature zones Z1 and Z2 are provided for the
compressor control; see also chapter 2 Functions. The Z1 temperature zone is operated in the NT range and
Z2 in the LT range as default. However, it is also possible to operate Z2 in the LT range so that the controller
can regulate two LT circuits; see chapter .System expansion options, page 20
The compressor controller basically includes the following control and regulation functions:
Low-pressure control (LP, compressor control) for one-circuit systems - as step or combined control
Low-pressure control (LP, compressor control) for one-circuit systems for the normal temperature (NT)
and low temperature (LT) temperature ranges - as step or combined control
Load shedding
Base load rotation
Compressor monitoring
Safety loop
Discharge gas defrosting D2D two-pipe system
High-pressure control (HP, condenser control) for one-circuit systems − as step, speed or combined control
4.2.1 System expansion options
The VS 3010 BS pack controller is specially designed for booster, satellite and cascade operation. In these
operating modes, different refrigeration circuits are operated with only one condenser unit and with only one
common high-pressure line. The refrigeration points are supplied from one common condenser receiver. The
following illustrations show the schematic layout.
Booster mode
During booster operation (parameter Boost./Kaskade = ON, see menu 3-1), the refrigeration points are also
supplied using the same liquid line. While the suction lines of the Z1 / NT circuit feed directly into the main
compressor, the refrigerant for the Z2 / frozen food display cases is initially fed through the so-called booster
stage. In the booster stage, the refrigerant pressure from the frozen food display cases, which is also lower
due to the lower evaporation temperature, is increased to the pressure level of the suction lines of the Z1
normal temperature refrigeration points.
If all the Z1 compressors are at standstill and Z2 compressors are loaded, the first Z1 compressor is loaded
immediately following the overshoot of the setpoint plus half of the neutral zone, i.e. the control times are
ignored. The control times remain ignored for the first compressor. Every additional Z1 compressor is loaded
after expiry of the basic and the variable lead time. If the suction pressure drops in the Z1 area, Z1
compressors are unloaded after expiry of the basic and variable unload time. One compressor remains in
operation, independent of the suction gas pressure. The Z1 compressor still being controlled is not switched
off until after all Z2 compressors have been switched off.
Layout of a booster system: