Closed-loop thyristor current control
System- and communication configuring D7-SYS - SIMADYN D 5-57
Edition 06.2002
parameter PA6.XDA.
e.g. PA6.XDA= 0.0 [°] ⇒ PA6.AVW = -30 [°]
PA6.XDA= +10.0 [°] ⇒ PA6.AVW = -20 [°]
Value range PA6.XDA {-180 [°] …+180 [°] }.
Firing pulse
V
L1-MP
Pulse position change
with PA6.XDA:
+
...0...
-
V1
V2
α
= 150°
Ground at pin ITDC -X5:14
15V
7.5V
V5 V6V4V3
0V
Fig. 5-30 Pulse position for a correctly set offset angle
• The correct firing pulse position must be checked after each
correction and if required should be further changed. The position
must be precise!
• Switch-off command (SOL.ION = 0) or (SOL.ON1 = 0)
• Switch-off the power to the Sitor set
• Remove the measuring cables for phase voltage L1 (!) and pulses.
5.3.6 Determining the armature time constant TA
The armature time constant TA is determined, in the open-loop controlled
test mode using a “Current step” outside the discontinuous range.
The current actual value of the armature circuit should be plotted.
The SITOR set provides the current as voltage signal (I
rated
= -10V) at test
socket I
act
( –A1: bottom right, M right-4
th
socket from the bottom) or at
terminal–X15 :1 ( :3 is ground).
The current can be connected to an oscilloscope channel using a clip-on
ammeter or the internal value via the configured analog output.
• The armature circuit should be closed again.
• The motor rotor should be mechanically locked, as the remanence
field still generates a torque in the motor.
• Open the field circuit and inhibit the excitation! (FCS.IE=0).
Pulse position for a
correctly set offset
angle
Procedure
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