Closed-loop thyristor current control
System- and communication configuring D7-SYS - SIMADYN D
5-9
Edition 06.2002
5.2.1.2 Line supply analysis / rotating field detection
The following functions are processed in this program section:
1. The filtered, internal synchronizing voltage (V
SYN
) is monitored
2. The line supply is checked for a clockwise rotating field
3. The actual offset angle is determined
4. The period duration is checked for stability and
that the rough limits are maintained
The scope of the monitoring calculations to be executed is parameterized
via connection PA6.INV.
a) If INV=0, the line supply is permanently checked for a clockwise
rotating field and the offset angle is determined
.
b) If INV=1, a check is made once when starting.
c) If INV=2, there is no monitoring.
START
Pulse inhibit
,
controller inhibit
RDY = 0
V
SYN
Available
and stable
?
or
INV=1, and
1
st
run-through
?
edges
V
L12
,V
L13
present and
stable
?
Clockwise rot.
field
detected
?
Output,
offset angle
YDA = V
L1
-
V
L31
Rot. field fault
QSF\bit 6
V
L12
\ V
L13
missing
QSF\bit 3,4
Synchron. voltage
missing \ erroneous
QSF\bit 1,2
Pulse/controller
enable
RDY=1
No
Yes
Yes
No
No
No
Yes
Yes
INV=0
or INV=2
Line
Fig. 5-6
Line supply analysis sequence
Line supply
analysis sequence
