ABB DCS 500B Description

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ABB DCS 500B Description Manual pdf 58 page image

Functional Software description50 DCS 500 Software DescriptionSelection of theField ExciterThe type of field exciter is selected by parameter FEXC SEL (505)0 [NO FIELD EXCITER]No field exciter selected1 [DIODE FIELD EXCT]Internal diode field exciter SDCS-FEX-12 [FEX2 OR FEX3]Internal SDCS-FEX-2 or ext. SDCS-FEX-33 [FEX3 FOR MOTOR2]Ext. DCF50x-0050 for motor 24 [FEX2/3 + MOT2=FEX3]internal SDCS-FEX-2 or ext. DCF50x-0050 as first field exciterand external DCF50x-0050 (FEX3) as a second one5 [FIELD ACK VIA DI]Other field exciter, acknowledge through DI6 [FIELD ACK VIA AI]Other field exciter, acknowledge through AIField ExciterStatusStatus of the field exciter(s) can be seen from the maintenancefunction FEXC STATUS (11203).FEXC STATUS (11203)BIT Internal name Comment0 FEXC1_RDY_OPER 0 = not ready for operation (AC-voltage missing)1 FEXC1_ OK 0 = selfdiagnostics failed or power failure in fex 12 FEXC_2 RDY_OPER 0 = not ready for operation (AC-voltage missing)3 FEXC2_OK 0 = selfdiagnostics failed or power failure in fex 24 ACK_FEXC1_ON 1 = motor 1 field OK5 ACK_FEXC2_ON 1 = motor 2 field OK6 FIELD_HEAT_ON 1 = motor heating function active7 FIELD1_REV_ACK direction of the field 0 = forward, 1 = reverse8 ACK_CSC_ON 1 = on-command accepted by sequence control9 ACK_FEXC_ON 1 = motor field OKNo Field Ac-knowledge Se-lectedIf FEXC SEL (505) = 0, then the field acknowledge signal has nosignificance. This case is only for testing purposes. The first fieldexciter and the second field exciter are used with a "Shared mo-tion" function.Internal Diode FieldExciter SDCS-FEX-1The current setpoint using the FEX1 is selected by selecting anappropriate voltage output from a field transformer. The programdoes not measure the current value but an acknowledge signal isformed which supervises whether the field exciter has current ornot. Other parameter settings are not needed. The acknowledgesignal cannot be read directly but if the signal TC_RDY_RUN(11204) bit 2 is zero more than 6 second after ON-command, thedrive will trip to the fault: NO FIELD ACK.