
CHAPTER 1 - DESCRIPTION
49'1335 e
AMX DPS DC-POWER MODULE
1
Features
RELIANCE ELECTRIC DC Power Modules are
3 phase AC/DC converters and are used for the
step less regulation of DC-motors. They are
available in two variants:
For single-quadrant operation S-6
Controlled rectifier bridge with two directions.
Clockwise rotation (I. Quadrant)
or CCW rotation (III. Quadrant) motoring.
For four-quadrant operation S-6R
This converter works as rectifier and inverter
and allows operation in both directions of
rotation in motoring and regenerative mode
(driving and braking).
AC-line reactors and super fast acting fuses are
not included in the device and have to be
mounted separately.
The DC Power Modules are designed as power
units for DC-drives in AutoMaxDistributed Power
Systems ( AMX DPS ).
They contain in addition to the power stack
PC-boards with the following functions:
- Firing pulse transmission
- Line synchronization signals
- Line voltage feedback
- Armature current feedback
- Armature voltage feedback
- Snubber circuit
All control and regulator functions of the
converter are executed fully digital in the
Universal Drive Controller Module (UDC)
mounted in an AutoMax rack and in the Power
Module Interface Rack (PMI).
Protective measures
A balanced protective concept ensures a high
degree of reliability.
- On single-quadrant drives fast acting fuses
must be provided on the mains supply side to
protect the thyristors against short circuits.
- On four-quadrant drives fuses are also
required in the armature circuit.
- Instantaneous electronic trip (IET) protects
the device against overcurrent and over-
voltage peaks.
- Summing RC-networks limit the voltage at the
thyristors.
- Converters with cooling fan (>=120A) are
protected against excessive temperatures
from overload or fan loss by thermostats on
the heatsink.
- The controller is electrically isolated from the
power unit.
- Regulator blocking on undervoltage or phase
loss.
- Mains connection with optional phase
sequence .
- Automatic adaptation to line frequency 50 Hz
or 60 Hz (on units <=1500A).
- The DPS checks the drive before power up
and during operation by the means of
extensive diagnostic-routines. The following
faults are detected:
* Instantaneous overcurrent
* Loss of line synchronization
* Loss of speed feedback
* Software detected overspeed /overvoltage
* External IET(Instantaneous electronic trip)
* Incorrect phase detection
* Shorted thyristor