Closed-loop thyristor current control
System- and communication configuring D7-SYS - SIMADYN D 5-61
Edition 06.2002
CH1 : System deviation via D/A converter
CH4 : Current act. value measured with a clip-on ammeter
KP = 0.14
TN = 25ms
Fig. 5-35 Transient response, current actual value, low overshoot (schematic)
5.3.8 Field supply
The SITOR field device is a half-controlled, single-phase rectifier
(B2HKFU), where the power module and the control are one mechanical
and electrical unit. The field device is permanently installed in the SITOR
set, e.g. 6QG32x with the "Field device" option.
The current actual value is sensed using a shunt on the DC current side.
The current actual value is available at the SITOR electronics module -A1
at test socket "l_E
act
" (-10V = I_E
rated
).
The current actual value is adjusted to the rated current in the plant.
Potentiometer R402 can be used to adapt the internal amplifier stage
(electronics module -A2).
There are three ways of entering the current setpoint:
• The setpoint for the field excitation current is transferred to the field
electronics A2 via the SITOR interface ITDC-X7 via the electronics
module -A1 with ribbon cable.
Switch
• Via potentiometer R212 on board -A1. In this case, switch -S217 must
be changed-over to setting 2/3 (this switch is soldered! ).
Transient
response, current
actual value, step
from zero
Current actual
value sensing
Current setpoint
input
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