Siemens SIMADYN D User Manual

Closed-loop thyristor current control
System- and communication configuring D7-SYS - SIMADYN D 5-7
Edition 06.2002
The FB–PA6 is used to continuously synchronize the firing pulses to the
line supply for a 6-pulse line-commutated converter.
The actual value for the firing pulse position is generated and transferred
to the firing pulse controller FB–PC6 in order to evaluate the correct
position of the firing pulses. The firing angle actual value is determined
taking into account the input filter on the ITDC and the offset angle.
The ITDC generates the interrupt to start FB-PA6 in synchronism to the
firing pulses via the local expansion bus (LE) depending on the internal
counter states.
Program sections of the gating unit which are always executed.
• A line supply analysis, which checks the availability of the
synchronizing voltage and which executes plausibility tests.
• Synchronizing the firing pulses to the synchronizing voltage.
• Determining the offset angle and other line supply quantities.
Synchronization to the line supply (single-phase synchronization) is
realized using a synchronizing voltage derived from the electronics power
supply of the SITOR set (standard) or with the external synchronization
ITDC X5 : 5 \ 6.
YDA
pa6.dsf
NEP
FAM
XDA
FNT
[°]
AFI
QSF
NZG
Line
synchr.
f
(new-old)
f
(NCM)
Line
switch-on
counter
NWD
NCM
[°]
Rot. field
detection
XFN
Error
eval-
uation
NAZ
++
6
Y6R
AFP
XAS
Line
zero
crossovers
INV
ITDC
line
timer
angular
difference
ITDC
filter
[°]
RDY
ITDC
current
duration
YIT
Fig. 5-4 Block diagram of PA6
Function

Siemens SIMADYN D Specifications

General

Brand	Siemens
Model	SIMADYN D
Category	Control Systems
Language	English