Siemens SIRIUS 3RT Series System Manual page 11

4 SIRIUS 3RV2 motor starter protectors................................................................................................... 379
4.1 Standards...................................................................................................................................379
4.2 Product description ....................................................................................................................380
4.2.1 Introduction ................................................................................................................................380
4.2.2 Versions .....................................................................................................................................381
4.2.3 Applications................................................................................................................................382
4.2.4 Motor starter protectors..............................................................................................................383
4.2.5 Performance features ................................................................................................................384
4.3 Product combinations ................................................................................................................385
4.4 Functions....................................................................................................................................386
4.4.1 Overload and short-circuit protection.........................................................................................386
4.4.1.1 Tripping classes .........................................................................................................................387
4.4.1.2 Tripping characteristics ..............................................................................................................388
4.4.2 Phase loss sensitivity.................................................................................................................390
4.4.3 Protecting single-phase loads or DC loads................................................................................390
4.4.4 Test function...............................................................................................................................390
4.5 Configuration..............................................................................................................................391
4.5.1 Short-circuit protection ...............................................................................................................391
4.5.2 Motor protection .........................................................................................................................391
4.5.3 System protection ......................................................................................................................391
4.5.4 Motor protection with overload relay function ............................................................................392
4.5.5 Short-circuit protection for starter combinations ........................................................................392
4.5.6 Transformer protection...............................................................................................................393
4.5.7 Main switch ................................................................................................................................393
4.5.8 Use in IT systems ......................................................................................................................393
4.5.9 Switching direct current..............................................................................................................394
4.5.10 Devices for North America (UL/CSA) ........................................................................................395
4.5.10.1 Approved according to UL 508/CSA C22.2 No. 14....................................................................395
4.5.10.2 Approval as "circuit breaker" according to UL 489/CSA C 22.2 No. 5-02 .................................396
4.5.11 Application environment.............................................................................................................396
4.5.12 Selecting the motor starter protectors........................................................................................398
4.5.13 Project guidelines for use downstream of frequency converters/inverters with pulsed
voltage........................................................................................................................................398
4.5.13.1 The effects of high-frequency currents on the thermal overload release ..................................398
4.5.13.2 Capacitive leakage currents.......................................................................................................399
4.5.13.3 Speed control of motors with characteristic-controlled frequency converters ...........................400
4.6 Mounting ....................................................................................................................................401
4.6.1 Standard mounting.....................................................................................................................401
4.6.1.1 Minimum clearances and mounting position..............................................................................401
4.6.1.2 Mounting ....................................................................................................................................402
4.6.2 Mounting in limiter circuit ...........................................................................................................403
4.7 Connection .................................................................................................................................403
4.8 Operation ...................................................................................................................................404
4.8.1 Setting the current......................................................................................................................404
4.8.2 Testing the overload release......................................................................................................405
4.8.3 Testing the overload relay function (3RV21) .............................................................................405
4.8.4 Securing .....................................................................................................................................406
4.8.5 Reclosing after tripping ..............................................................................................................406
4.9 Accessories................................................................................................................................407
4.9.1 Accessories overview ................................................................................................................407
4.9.2 Installation rules/Component rules ............................................................................................409
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
Table of contents
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