Closed-loop thyristor current control
5-16
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002
YFO
YFU
QSF
YUA
YEM
emf.dsf
AAV
PRV
ARV
NF
TA
XFO
RA
XC
ITDC
f
x
#
Fault
eval.
[kHz]
[kHz]
[kHz]
YUL
YEV
−
YUR
f
(#)
f
(YUA)
f
(XC)
Fig. 5-9
EMF block diagram
For EMF.NF = 1, the normalized values {0
…
1} are displayed at outputs
ENF.YEM, .YUA, .YUR, .YUL.
If NF is set to ARV, absolute values
=
ˆ
[V] are displayed. When the value
is changed-over, this has an effect on the settings of the control
parameters!
The output voltage V
d
of the drive converter is converted into a frequency
using a voltage-frequency converter and is transferred via the SITOR
interface.
rated
V
1
,
0
V
,
1
-
[kHz]
90
60
30
:
Range
RRV
Sitor
V
30[kHz]
60[kHz]
U
f
∗
+
=
∗
→
←
⋅
+
=
The number of pulse edges of this signal are converted into a value,
integrating over the time period between two firing pulses.
Calculating the drive converter output voltage from the frequency:
−
−
∗
∗
=
]
kHz
[
30
XFO
]
kHz
[
60
U
f
ARC
NF
RRC
YUA
.
EMF
Calculating the induced voltage of the motor
EMF
from the output voltage
and the current actual value:
(
)
dt
di
A
L
A
I
A
R
d
V
∗
−
∗
−
=
EMF
V
is converted into
YUL
YUR
YUA
EMF.YEM
−
−
=
Normalization
Sensing the
terminal voltage V
d
