Siemens AS 235 appendix Permissible thermal loading, Standard cabinet with heat exchanger

Page 49

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Automation systems

Standard cabinets

Permissible thermal loading

Permissible thermal loading, configuring guidelines ￿Standard cabinets without forced ventilation

Basic and extension units fitted in standard cabinets can be operated without fans if

• the cabinet thermal load Ps max permissible depending on the cabinet unit temperature is not exceeded and

• a heat loss greater than 150 W does not occur in any extension system.

If many I/O modules are used with a high heat loss, these should not all be fitted next to one another but distributed amongst the various subracks in order to prevent heat accumulation. Ps max is usually not achieved in the extension cabinet even with the full configuration of 42 I/O modules. An exact determination of the total heat loss is only required with a non-typical module config- uration (many I/O modules of the same type, modules with more than 8 W heat loss).

Standard cabinets with degree of protection IP 20, with forced ventilation

Extension unit with > 150 W/subrack

Basic and extension cabinets whose thermal load (without fan subassembly) is not exceeded must be provided with forced ventilation if an extension unit is configured with I/O modules such that the heat loss of this subrack exceeds 150 W. At least one fan subassembly must then be provided between the basic unit GE and the 1st extension unit EE1 (in the basic cabinet) or between the 4th and 5th extension units (in the extension cabi- net).

Cabinet thermal load > 350 to 450 W, < 700 W

If the thermal load is between 350/450 W (depending on cabinet ambient temperature) and 700 W, and if 150 W is not exceeded in any extension unit of the cabinet, at least one fan subassem- bly must be provided between the basic unit GE and the 1st extension unit EE1 (in the basic cabinet) or between the 4th and 5th extension units (in the extension cabinet).

A 2nd fan subassembly must be provided if an extension unit is additionally configured with I/O modules such that its heat loss exceeds 150 W. The 2nd fan subassembly must be fitted above the 3rd extension unit EE3 (in the basic cabinet) or above the 6th extension unit EE6 (AS 235, extension cabinet) or above the 7th extension unit EE7 (AS 235 H, extension cabinet).

Standard cabinet with heat exchanger

The standard cabinet with heat exchanger can be operated without an additional fan subassembly if the total thermal load of 350/450 W (depending on cabinet ambient temperature) is not exceeded in the cabinet and if 150 W is not exceeded in any extension unit.

The standard cabinet with heat exchanger is operated with a fan subassembly if the total thermal load is < 700 W and if 150 W is not exceeded in any extension unit. The fan subassembly must be fitted between the basic unit and the 1st extension unit EE1 (in the basic cabinet) or between the 4th and 5th extension units EE4 and EE5 (in the extension cabinet).

If the thermal load in one of the three extension units exceeds 150 W or if the total thermal load exceeds 700 W, a 2nd fan sub- assembly must be fitted between the 2nd and 3rd extension units EE2 and EE3 (in the basic cabinet) or between the 5th and 6th extension units EE5 and EE6 (AS 235, extension cabinet) or between the 6th and 7th extension units (AS 235, extension cab- inet). A maximum thermal load of 1000 W is then permissible.

Configuring values for thermal load

 

AS 235

 

 

Basic cabinet

≤ 150 W

 

without I/O modules,

 

 

redundant bus connection

 

 

Bus connection, single

- 10 W

 

Connected extension cabinet

+ 16 W

 

AS 235 extension cabinet without I/O

 

 

0 W

 

modules

 

 

AS 235 H

 

 

Basic cabinet

≤ 200 W

 

without I/O modules,

 

 

redundant bus connection

 

￿Bus connection, single

- 10 W

 

Connected extension cabinet

+ 8 W

 

AS 235 H extension cabinet without

30 W

 

I/O modules

 

 

 

 

Siemens PLT 111 · 1999

3/25

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Page 48 Page 50
Contents Teleperm M Brief description IntroductionFunctions of the AS 235 system ConfiguringGeneral system data System dataTechnical data of automation systems Or user-configured with own System architecture ConfiguringPerformance characteristics Operation and monitoring TML languageScope of performance Redundancy with the AS 235 H automation system Redundancy with AS 235 HImportant note Standard function blocks ConfiguringStandard function blocks Blocks for analog and digital processingData blocks Blocks for signal exchange via CSType Designation Function For modules with Order No Driver blocks for I/O modulesDriver blocks for I/O modules with standardized display Driver blocks for configurable Teleperm ME I/O modulesOrganization blocks Output blocks for printer and process monitorSystem architecture Performance characteristics Summary of system properties Redundancy with AS 235 H Configuring Data blocks Driver blocks for I/O modules Driver blocks for configurable Teleperm ME I/O modules Output blocks for printer and process monitor AS 235 H Connection diagramsAS 235 K ES 100 KGeneral GeneralAS 235 automation system Basic cabinetBasic cabinet Basic unitExtension units Standard I/O devicesBus components Power supply componentsOrdering data Ordering data for basic cabinetAS 235 automation system Basic cabinetOptions for AS 235 basic Cabinet Options for basic cabinet6DS9 002-8BB See page 6/6Extension cabinet Extension cabinetExtension cabinet Options for AS 235 extension CabinetAS 235 H automation system AS 235 HAS 235 H automation system, design 6DS3 305-8BA Example of redundancy with Redundant process I/OsInterface modules for 20-m local bus N-AS AS 235 H automation system Options for AS 235 H basic Cabinet AS 235 H extension cabinet AS 235 H automation Ordering data for extension cabinetSystem Extension cabinet Options for AS 235 H exten Sion cabinetBasic system AS 235 KAS 235 K automation system Basic systemAS 235 K automation system, design Interface module for ES 100 KOrdering data for AS 235 K HousingAS 235 K automation SystemES 100 K extension system ES 100 KES 100 K extension system ES 100 K extension Ordering data for ES 100 KES 100 K options Standard cabinets and accessories Standard cabinets and accessoriesSystem cabinet accessories Standard cabinetsOrdering data for system cabinet accessories Permissible thermal loading Configuring values for thermal loadStandard cabinet with heat exchanger Standard cabinets IP 20 without heat exchanger Technical dataDesign 12 Standard cabinet with heat exchanger Standard cabinets IP 54 with heat exchangerProcess connection systems Connections for process signal cablesProcess connection systems Process connection systemsConnection diagrams for standard I/O devices to AS AS 235 K Connection diagramsStandard I/O devices to AS 235 / AS 235 K Connection of personal computer Connection of personal computerConnection of process monitors and parallel monitors Connection of process monitors and parallel monitorsStandard I/O devices to AS 235 H Connection diagrams for standard I/O devices to AS 235 HConnection diagrams Connecting cable Plug Cable Max. cable Order No From Length Summary of connecting cablesFunction modules Signal modulesProportioning Counter modules Summary Configurable I/O modules General technical dataLightning protection with distributed configuration Power supply, earthingModules from other systems Selection criteria for I/O modulesClosed-loop control modules Function modulesFunction modules Closed-loop control modulesSignal modules Signal modulesAnalog input and output modules Binary input and output modules Binary input and output modulesBinary input module, testable, 6DS1 618-8CA Binary output module with 16 relays, 6DS1 605-8BAProportioning and counter modules STRUK-AS 220 EA configuring programProportioning counter module, metering pulse input module Metering pulse input module with 8 channels, 6DS1 607-8ABModules which can be used on the I/O bus Modules which can be used on the I/O busExplanations for the column Release Explanations for the column Remarks6DS1 342-1BD With S5KE Test mode Mode of operationOperation unit PBT 65 process operation keyboardConfiguring keyboard Configuring unitConfiguring keyboard Mini floppy disk unit Mini floppy disk unitMini floppy disk unit 6DS3 900-8AE Floppy disksBus communication Application ApplicationLocal range Remote range DesignSingle remote bus Connection distributor AV Connector board AF Remote busBus converter Ul Redundant remote busBus configurations, examples Bus configurationsApplication Other conditions Connecting cables Connecting cables for 20-m local bus Connecting cablesConnecting cables for remote bus Central controllers Expansion unitsSimatic S5 I/Os ET 100U Coupling of other systems Interface modules for coupling with other systems, summaryParallel coupling with S5-115U I/O modules Simatic S5 expansion unitsParallel coupling with Simatic S5-115U I/O modules Digital input modules Simatic S5-115U I/O modules appropriate for couplingDigital output modules Digital input/output modulesParallel coupling with Simatic S5-135U/155U I/O modules Parallel coupling with S5-135U/155U I/O modulesSimatic S5-135U/155U I/O modules appropriate for coupling Interface module for Simatic S5 expansion units Interface module for Simatic S5 expansion unitsSerial coupling With Simatic S5/S7 central controllers Simatic S5/S7 central controllersSerial coupling with Simatic S5/S7 central controllers Interface module for Simatic S5/S7 central controllers Interface module for Simatic S5/S7 central controllersSerial coupling with Simatic S5 I/Os Simatic S5 I/Os / ET 100UExi modules ET 100U I/O modules appropriate for couplingInterface module for ET 100U Interface module for ET 100UOrdering information Ordering of complete systems AS 235 standard configurationOrdering of options
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