Sanyo 550 instruction manual Temperature Control, Heating, Cooling, Refrigeration unit control

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3.2. TEMPERATURE CONTROL

Accurate, repeatable temperature control levels are achieved by continuously balancing heat loss with intermittent modulated heating controlled by electronic controllers.

The conditioned air flows over a dry platinum resistance temperature sensor (BS1904, lOOohms at 0°C) which feeds signals back to an electronic controller. The actual temperature is compared with the operator set temperature and errors are corrected by switching the heaters viarelays on a timeproportioning basis to achieve smooth accurate control.

3.2.1HEATING

One or more "mconel" sheathed electrical heating elements are situated in the treatment area. These elements normally operate only at black heat, for a long life and avoidance of excessive heater surface temperatures.

3.2.2COOLING

All models have CFC-free mechanical refrigeration units with a direct cooling coil to achieve the minimum temperature specified

All refrigeration compressors are protected for operation at working chamber temperatures up to +70°C.

Cabinets with a -70°C lower temperature limit (CF7 models) use cascade refrigeration systems.

The main and auxiliary cooling modes are automatically selected by the control system to enable:

a)freefall temperature pull-downs from the cabinets maximum temperature, ie the fall rate is as fast as possible down to +70°C or below.

b)temperature dwells below +40°C (auxiliary cooling is used between +40°C and +15°C if high humidity control is required).

c)extraction of heat dissipated from the test load between +70°C and the minimum op- erating temperature.

d)the cooling coil's low surface temperature to dehumidify the cabinet between +5°C and+70°C.

Refrigeration unit control

The refrigerator is controlled by the switching of solenoid valves which pass refrigerant to pressure switches, which in turn energise the refrigerator compressor motor. There is a short delay between switching and motor start up. Similarly, pressure switches act as safety devices, preventing excessive pressure which might arise when the refrigerator is not selected, and the refrigerant is heated by the cabinet. In such cases, the pressure switches detect theincipient pressure rise and switch on the compressor to "pump down".

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Contents Environmental Chamber Sanyo GallenkampCustomer De Ronde Programming system Contents Part ONE the Cabinet Introduction Health & Safety at WorkSanyo Gallenkamp service & maintenance facilities Commissioning U.K. Customers onlySpecification Physical Cabinet DataShelf Exterior/finishInsulation False roofOptional Facilities Specification PerformanceCF1 System Channel Format 550 Digital ChannelsDigital Channel Cooling Main Digital Channel Cooling AuxiliaryDigital Channel 8 Voltage Free Terminal VFT User Programmable ChannelDESCRIPTI0N Principle and AirflowCooling Temperature ControlHeating Refrigeration unit controlRelative Humidity Determination Vapour phase generationRelative Humidity RH Relative Humidity ControlRelative Humidity Decrease Positioning InstallationAccessories & Spares Cabinets not requiring on-site commissioningInstrument compartment Mains Interrupt Bridge Ambient TemperaturePower Supply DrainTest Load Protection Distilled Water SupplyWetwicks EitherCable Port 13. RS232 ConnectorSafety Thermostat VentControl Panel Instrumentation INDICATORS/PUSHBUTTONSReset Amber pushbutton MainsTo Start the Cabinet Cabinet and Program Start UPCabinet and Program Shut Down To Shut Down the Cabinet Normal SequenceWeekly or between tests Maintenance and CareMaintenance Schedule MonthCleaning of cabinet drains Maintenance MethodsInterior and exterior cleaning Inspection and replacement of the wet wicksLubrication Check safety thermostatClean the refrigeration condenser Distilled water filterAppendix 1 Part Numbers Appendix 2 REC/W Water System InstallationMaintenance OperationDeioniser replacement System drainingContents Part 2 Format 550 InstructionsIntroduction to Format Format digital channelsHow to use these instructions Getting started Menu systemUsing the data entry windows Using the on-line helpFunction keys Status bar Types of data entry fieldPage Condition setting General Operating Sequence Steady State ModeResetting steady state setpoints Condition monitoringEnding manual control Condition C %RH Status Logging General Operating Sequence Entering a NEW ProgramGeneral Operating Sequence Running a Program Main MenuHow to use Format programming sheets Writing a ProgramSelecting digital channels when you know best Entering the data into the programmerLoading and saving programs Running a program LogProgram Monitor Window Holding a programProgram deletion Program completionView program graph Starting Data Logging Introduction to Data LoggingLog Displaying Results Stopping Data LoggingLoading into Spreadsheets Introduction to Alarms Setting AlarmsPage Computer Interactive C0MPUTER InterfacingIntroduction Host PC System RequirementsConfiguring the Host Software InstallationInstalling the Security KEY Setting UP OFF-LINE Chamber IntelligenceMain Menu Network Monitoring ModeSteady State Control Logging ProgramPrintouts Program Physical Layer Definition Computer interactive interfacing main protocolCommunications Frame Definition Packet Count HeaderSerial Number Length Serial Number Compatibility with RS485 Multi-Controller ConfigurationData Block Length Data BlockPacket Flow Summary Controller Configuration RequestController Configuration Functional Layer Definition129 Status RequestPage Open File for Reading Close File Read DataOpen File for Writing Write Block to FileSET Controller to Local Access Mode SET Controller to Remote Access ModeSET/CHANGE Steady State Condition ENABLE/DISABLE Manual Hold ENABLE/DISABLE Guaranteed SoakDigital Channel Description Computer RS232 Format 550 socket Pin D type Cable connectionsCDR Support software Operator interface data entry Appendix 1 Technical SpecificationOperating temperature Control LoopsMonitoring displays AlarmsProgram Run Options Data LoggingExample Appendix 2 Program Looping and Nested LoopsLoop Instructions Temp Hum LS Rep Digital Channels Ddhhmmss CCalculation for Succeeding Events Event statement time = event actual time total looping timeNested Loops Effects on the Running Timebase DisplaySeconds Example of Nested Loops Appendix 3 Format 550 Programming Sheets Format Programming SheetContact Information LEU ORE

550 specifications

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