Closed-loop thyristor current control
5-48
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002
If a configuring error is detected, the outputs FCS.QON \ .QEO and the
field current setpoint are set to zero.
0
1
&
T
T
f
(FC)
ITDC
D / A
Fault
eval.
Control
0
1
&
NF
FC
RRC
ARC
ION
IOF
EN
IE
QSF
T
QON
QEO
ON
0,0
≥1
ON
Option
Fig. 5-27
Function chart FCS
The behavior of the control is switched-over with the selection “Option:
Field device” (FCS.IE = 1).
The delay time FCS.T runs when switching-in and switching-out.
•
FCS.EN generally enables the function block.
As soon as the input is reset, the excitation is reduced and the outputs
QON, QEO and the excitation current fault (FCS.QSF) are set to 0.
•
FCS.ION “Switch-in command”
(FCS.ION=1, .IOF=0, .IE=1)
Outputs the field current setpoint FCS.FC at the D/A converter and
therefore switches-in the field. At the same time, output QEO is set.
After time FCS.T has expired, after the field has been established, the
switch-over logic stage FB SOL is switched-in with FCS.QON.
The evaluation of the fault signal “Field current < 3%” is also activated
with a delay of this time. If the signal is still present, then there is a
fault in the motor excitation and operation is inhibited.
•
FCS.IOF “Switch-out” (IOF=1 )
With IOF=1, the switch-in command is withdrawn at FCS.QON and
the field and output FCS.QEO are switched-out, delayed by the time.
Switching-in and
switching-out the
excitation
