Armature Circuit Interface; Field Circuit Interface - ABB DCS800 Hardware Manual

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Armature circuit interface

The function for armature circuit interface consist of:
• Firing the armature bridge of 6 or 12 thyristors.
• High ohmic measurement of DC and AC voltage.
• Interface for AC current transformer for current measurement.
• Snubber circuit for the thyristor protection together with resistor R1 on heatsink.
• Interface for heatsink temperature measurement with a PTC resistor.
• Fuses for overvoltage protection and field circuit.
The same board can be used for 3 phase field exciters without modification.
The current measurement is adjusted by TYPECODE parameter 97.01 and automatic adjusted by rated
motor current.

Field circuit interface

The On board fieldexciter is located internally. The firing pulses are synchronized from mains circuit
L1,L2,L3 and SDCS-CON-4 board. The pulses are amplified on PIN4 board. The hardware structure is
a three phase half controlled bridge supplied direct from mains circuit U1, V1 , W1 via fuses F100,
F101, F102.
If the On board field exciter is not needed it can be switched OFF by firmware.
The function of field circuit interface consists of:
• Firing the field bridge three phase half controlled bridge.
• Measurement of DC field current, the scaling is automatically selected via rated motor field current.
• Snubber circuit are shared with armature bridge.
• Fuses F101, F102, F103 for cable and motor field protection.
Ratings
AC voltage range
AC insulation voltage
Frequency
AC input current
Minimum Current
DC output current
max. cross sectional area
min. cross sectional area
Fuse type
Technical data
110...500 V (525 V)
500 V
50 Hz / 60Hz
< field current
?300 mA
Size
16 mm²
AWG 6
1 mm²
AWG 16
3ADW000194R0201 DCS800 Hardware Manual e b
D1 D2
6A 15A
16 mm²
AWG 6
2.5 mm²
AWG 12
KTK - 25
D3 D4
20A 25A
16 mm² 16 mm²
AWG 6 AWG 6
4 mm² 6 mm²
AWG 10 AWG 8