Closed-loop thyristor current control
5-74 System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002
5.6 Definitions
All of the current-dependent quantities are referred to the rated system
current CAV.ARC (e.g. rated motor current) and normalization factor
CAV.NF, specified by the user.
All of the voltage-dependent quantities are referred to the rated system
voltage EMF.ARV (e.g. rated motor voltage) and the normalization factor
EMF.NF.
If the instantaneous drive converter output voltage Vd is the same as the
value configured at input ARV (Vd=ARV), then in the normalized
representation type (NF=1), the output value YUA=1.
For DZ=1, a firing pulse pair of a phase is constantly output in the
constellation 1-4, 2-5, 3-6 or 4-1, 5-2, 6-3.
1
3
5
2
6
4
D1
H4
Z3
D3
H6
Z5
D5
H2
Z1
H5
Z4
H3
Z2
H1
Z6
D2
D6
D4
L2L1
L3
Hx = main pulse
Zx = second pulse
Dx = double pulse
Fig. 5-38 Assignment of the firing pulses to the semiconductor devices
Normal operation with the actual firing pulses is resumed as soon as the
double firing mode has been de-activated.
The switch-over logic stage corrects the current controller and therefore
the firing angle setpoint during double firing operation.
5.6.1 Formats
16#FFFF = hexadecimal value
The “Firing angle” format is an internal format for calculations. A value
can be converted into degrees using the following formula:
90
1ASG
α
−=
Closed-loop
current control
Double firing
Format data
Firing angle
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