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ABB AO845 8-channel analog output unit

From: | Author:Wang | Time :2024-11-26 | 58 visit: | Share:

ABB AO845 8-channel analog output unit

The thyristor bridge can be 2-quadrant (6 thyristors)
or 4-quadrant (12 thyristors). For current ratings
up to 700 A the thyristor bridge consists of
integrated thyristor modules – more compact,
cost effective, less components – so the fuses are
installed outside the module, in the supply line.
For higher current ratings, disc thyristors are
used, so there is a branch fuse for each thyristor.
Each thyristor is protected by a snubber circuit.
AC voltage, AC current and DC voltage are
monitored. These measurements are utilized by
the converter software for supervision and protection. Overvoltage protection by means of
varistors is also provided.
Converters are always equipped with a cooling
fan integrated in the converter module.
The monitor and protective features, provided as
standard and listed below, have been designed,
keeping in mind, personnel safety, equipment
integrity and continuity of the process.
Motor: Loss of speed feedback
Overtemperature
Overload
Overspeed
Stall
Armature overcurrent
Armature current ripple
Armature overvoltage
Minimum field current
Field overcurrent
Converter: Thyristor temperature
Supply: Main supply undervoltage
Auxiliary supply undervoltage
Wrong phase sequence
The converter includes emergency stop and prevention of unexpected start-up as standard protective functions. The software also includes a
fault logger storing up to 100 faults in real time.
Information on internal signals is stored in the
data logger and it can be displayed by the
Commissioning and Maintenance Tool for easy
fault finding.
Converter software for application,
drive, and torque control
Drive Control receives either speed or torque
reference and gives a torque reference to the
Torque Control.
Torque Control is controlling the armature current, the field current and the EMF. It receives the
torque reference from the Drive Control or from
the Application Controller (APC). Auto/manual
tuning for armature current simplifies the commissioning and makes the tuning procedure

flexible.

2-phase, 4-quadrant, outside the converter

module, 50 A
Full controlled thyristor bridge, microprocessor
controlled, with separate power supply (115/230
VAC) for the control electronics. To achieve high
resolution in current measurement, the same
solution as in the half controlled 50 A field exciter
is used. This design offers field reversal and extra
forcing possibilities.
For steady state the full controlled bridge is
working in half controlled mode in order to
minimize voltage ripple. For fast changes of field
current the bridge is working in full controlled
mode. Insulation voltage 700 V, operation volt age ≤ 500 V (for operating voltages higher than
500 V an adaptation via T3 autotransformer is
available).
3-phase, 2/4-quadrant, 22 ...450 A
This field exciter is used for converter ratings of
2050...5150 A. For field current ratings above
50 A an external enclosed field exciter will be
used. Current ratings are same as the armature
current max. 450 A at 500 V AC and max. 400 A
at 600 V AC.
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