Functional Software description
50 DCS 500 Software Description
Selection of the
Field Exciter
The type of field exciter is selected by parameter FEXC SEL (505)
0 [NO FIELD EXCITER]
No field exciter selected
1 [DIODE FIELD EXCT]
Internal diode field exciter SDCS-FEX-1
2 [FEX2 OR FEX3]
Internal SDCS-FEX-2 or ext. SDCS-FEX-3
3 [FEX3 FOR MOTOR2]
Ext. DCF50x-0050 for motor 2
4 [FEX2/3 + MOT2=FEX3]
internal SDCS-FEX-2 or ext. DCF50x-0050 as first field exciter
and external DCF50x-0050 (FEX3) as a second one
5 [FIELD ACK VIA DI]
Other field exciter, acknowledge through DI
6 [FIELD ACK VIA AI]
Other field exciter, acknowledge through AI
Field Exciter
Status
Status of the field exciter(s) can be seen from the maintenance
function FEXC STATUS (11203).
FEXC STATUS (11203)
BIT Internal name Comment
0 FEXC1_RDY_OPER 0 = not ready for operation (AC-voltage missing)
1 FEXC1_ OK 0 = selfdiagnostics failed or power failure in fex 1
2 FEXC_2 RDY_OPER 0 = not ready for operation (AC-voltage missing)
3 FEXC2_OK 0 = selfdiagnostics failed or power failure in fex 2
4 ACK_FEXC1_ON 1 = motor 1 field OK
5 ACK_FEXC2_ON 1 = motor 2 field OK
6 FIELD_HEAT_ON 1 = motor heating function active
7 FIELD1_REV_ACK direction of the field 0 = forward, 1 = reverse
8 ACK_CSC_ON 1 = on-command accepted by sequence control
9 ACK_FEXC_ON 1 = motor field OK
No Field Ac-
knowledge Se-
lected
If FEXC SEL (505) = 0, then the field acknowledge signal has no
significance. This case is only for testing purposes. The first field
exciter and the second field exciter are used with a "Shared mo-
tion" function.
Internal Diode Field
Exciter SDCS-FEX-1
The current setpoint using the FEX1 is selected by selecting an
appropriate voltage output from a field transformer. The program
does not measure the current value but an acknowledge signal is
formed which supervises whether the field exciter has current or
not. Other parameter settings are not needed. The acknowledge
signal cannot be read directly but if the signal TC_RDY_RUN
(11204) bit 2 is zero more than 6 second after ON-command, the
drive will trip to the fault: NO FIELD ACK.
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