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2

EXAMPLES FOR THE SEQUENCE CONTROL OF PACKAGES

This chapter shows 4 possble and typical situations of compressor operation with sequence control. Other situa-
tions may occur depending on the system configuration and load fluctuations.

Important information about the diagrams

fig.3

"Control"

Reference to the explanation of the parameters in Chapter 1.1 (Local control)

"Sequence"

Reference to the explanation of the parameters in Chapter 1.2 (Sequence options)

Examples for the sequence control of Packages

Operating Manual | Sequence Control for Packages

GSC TP

14

GEA Refrigeration Germany GmbH | E_301510_2 | Generated 17.12.2014

Summary of Contents for GSC TP

Page 1: ...GSC TP Sequence Control for Packages Operating Manual Translation of the original text E_301510_2 ...

Page 2: ...ter called manufacturer This restriction also applies to the corresponding drawings and dia grams LEGAL NOTICE This documentation has been written in all con science However the manufacturer cannot be held responsible neither for any errors occurring in this documentation nor for their consequences Operating Manual Sequence Control for Packages GSC TP 2 GEA Refrigeration Germany GmbH E_301510_2 Ge...

Page 3: ...avy physical injuries or to the death Caution Stands for a possibly dangerous situa tion which could lead to light physical injuries or to damages to property Hint Stands for an important tip whose attention is important for the designa ted use and function of the device Operating Manual Sequence Control for Packages GSC TP GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 3 ...

Page 4: ...Operating Manual Sequence Control for Packages GSC TP 4 GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 ...

Page 5: ...nation of the parameters of sequence control options 12 2 EXAMPLES FOR THE SEQUENCE CONTROL OF PACKAGES 14 2 1 Conditions for capacity increase 15 2 2 Conditions for capacity decrease 16 2 3 Variable capacity demand example 1 17 2 4 Variable capacity demand example 2 18 Operating Manual Sequence Control for Packages GSC TP GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 5 ...

Page 6: ...Operating Manual Sequence Control for Packages GSC TP 6 GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 ...

Page 7: ...14 fig 4 Conditions for capacity increase 15 fig 5 Conditions for capacity decrease 16 fig 6 Variable capacity demand example 1 17 fig 7 Variable capacity demand example 2 18 Operating Manual Sequence Control for Packages GSC TP GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 7 ...

Page 8: ...Operating Manual Sequence Control for Packages GSC TP 8 GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 ...

Page 9: ...n the controller can change the capacity The zone lies symmetric around the setpoint The value must be less than the value for the proportional zone see 1 1 2 Capacity control of reciprocating compressors Auto start delay secs Initiated by process value rising above Neutral Zone and compres sor not running Auto stop delay secs The auto stop delay occurs only when the relevant compressor in the seq...

Page 10: ...o stop if it is allowed by the sequence module fig 1 Hysteresis Neutral Zone PV Process value SP Setpoint NZ Neutral zone HYS Hysteresis A Time characteristic of process value B Time characteristic of the 3 step controller outputs C Time characteristic of the pulse generator D Time character of the pulsed outputs to the capacity control solenoid valves Parameters Operating Manual Sequence Control ...

Page 11: ...t min Capazität max Capazität min Capazität min secs secs secs secs During increasing or decreasing capacity the capacity controller uses a step time to prevent too fast changes in compressor capacity This step time is calculated between its maximum and min imum value This calculation is made if the process value is within the proportional zone only The larger the difference between proc ess value...

Page 12: ...rol Sequence number 1 to 9 Each compressor must have a different number Minimum 1 Compressor must be able to reach this capacity sequence control may force compressor to hold this capacity Part load 1 Compressor must be able to reach this capacity sequence control may force compressor towards part load and to hold this capacity For screw compressors with Vi the value for the part load should be se...

Page 13: ... forced or held at Part Load or Maximum position and controlling compressor Auto stop delay secs Used to stop next compressor in sequence initiated by process value falling below sequence neutral zone Neutral zone K Used to start and stop compressors in sequence must be larger than local control neutral zone see 1 1 1 The value refers to the combination of active cylinder or the control slide posi...

Page 14: ...ion and load fluctuations Important information about the diagrams fig 3 Control Reference to the explanation of the parameters in Chapter 1 1 Local control Sequence Reference to the explanation of the parameters in Chapter 1 2 Sequence options Examples for the sequence control of Packages Operating Manual Sequence Control for Packages GSC TP 14 GEA Refrigeration Germany GmbH E_301510_2 Generated ...

Page 15: ...apacity increase fig 4 Conditions for capacity increase Operating Manual Sequence Control for Packages GSC TP Examples for the sequence control of Packages GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 15 ...

Page 16: ...apacity decrease fig 5 Conditions for capacity decrease Examples for the sequence control of Packages Operating Manual Sequence Control for Packages GSC TP 16 GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 ...

Page 17: ...demand example 1 fig 6 Variable capacity demand example 1 Operating Manual Sequence Control for Packages GSC TP Examples for the sequence control of Packages GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 17 ...

Page 18: ...demand example 2 fig 7 Variable capacity demand example 2 Examples for the sequence control of Packages Operating Manual Sequence Control for Packages GSC TP 18 GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 ...

Page 19: ...Operating Manual Sequence Control for Packages GSC TP Examples for the sequence control of Packages GEA Refrigeration Germany GmbH E_301510_2 Generated 17 12 2014 19 ...

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