ABB SPAM150C Motor Protection Relay
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.

The control system provides
a flexible and simple method of
controlling different drive
configurations.
The configurations comprise the converter and its
software, Application Controller, Engineering and
Maintenance tools and different communication
links to other automation systems.
The control system includes an Application Con troller (APC) and a Digital Drive Controller (DDC)
with well defined functions and interface.
The Application Controller (APC), common for
both AC and DC drives, is a single board control ler with all the software and hardware facilities
needed to handle the application specific func tions.
The Digital Drive Controller (DDC) is not pro grammable but various functions and operating
modes can be selected by a fixed number of
parameters, which are set from the APC level. The
motor control programs are located in the DDC,
which is controlled by either a torque or a speed
reference provided by the APC.
Stand-alone drive
A single drive has one Digital Drive Controller
DDC connected to the Application controller
APC.
Small drive system
In small systems, one APC is connected from 1 up
to 4 Digital Drive Controllers.
The small drive configuration can also be used in
master/slave applications.
Large drive system
Large systems are built by interconnecting appli cation controllers through a communication bus,
for example AF100. Common control functions
can be distributed to separate nodes. Even very
complex systems can be configured by using the
same system design concept and its common
building blocks, resulting in great savings in, for
example, spare parts.