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MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k

MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k

MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k

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<strong>2604</strong> Controller Safety and EMC InformationB.3.INSTALLATION SAFETY REQUIREMENTSB.3.1. Safety SymbolsVarious symbols are used on the instrument, they have the following meaning:!Caution, (refer to theaccompanying documents)Functional earth(ground) terminalThe functional earth connection is not required for safety purposes but to ground RFI filters.B.3.2. PersonnelInstallation must only be carried out by qualified personnel.B.3.3. Enclosure of live partsTo prevent hands or metal tools touching parts that may be electrically live, the controllermust be installed in an enclosure.B.3.4. IsolationThe fixed digital I/O and analogue input are not isolated. The PV Input and all plug inmodules are fully isolated. This is shown in Figure B-1.The Analogue Input is a self biased differential input suitable for either grounded or floatingtransducers of low output impedance generating signal in the range of +/-10V or +/-20mA(with a burden resistor of 100 Ohms across + and - terminals).This input is neither isolated from the instrument ground (which can be earthed via fixed I/Oports) nor isolated from the instrument earth terminal, therefore, under no circumstancesshould mains potentials be applied to any of its inputs.In order for the Input to operate safely the common voltage at the inputs measured withrespect to instrument ground should not exceed +/-120Vdc or ac rms. For actively enhancedcommon mode rejection (i.e. operation within the spec.) this voltage should be limited to +/-40Vdc.Floating transducers will automatically be biased to +2.5V with respect to instrument groundupon connection.Note: All the other I/Os are fully isolated from the instrument ground and eachother.User Guide. Part No HA026491 Issue 3.0 Apr-02 B-3

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