PLXD - Digital Stack Driver

The PLXD is used for controlling external
3 phase thyristor stacks for DC motors, and
possesses all the functionality of the PL/X
range. It is in the same package as the PL/X
5 - 50 models.
The PLXD provides gate drive pulses for
driving user supplied pulse transformers with
primary pulse current up to 1.5 Amp.
There are terminals to accept an externally
generated isolated armature current signal,
field signal, thermal heatsink sensor switch,
and high voltage armature voltage feedback.
The unit also provides a +24v supply for the
gate drive pulse transformers that is short
circuit protected.
The following stack configurations can be
driven by the PLXD:
1) 6 pulse 2 Quadrant bridge (6 thyristors),
or 2 bridges in parallel (12 thyristors).
2) 6 pulse 4 Quadrant regen anti-parallel
bridge (12 thyristors).
Extra stacks can be used in parallel within
the gate drive capability.
All customer control terminals are the
plug-in screw terminal variety.
The PLXD can be used with up to 690v AC on
its 3 phase auxiliary supply inputs (EL1/2/3).
The external stacks can be of higher voltages
if required.
The armature voltage inputs can monitor
up to +/-1000 Volts DC.
There is an integral motor field bridge with
independent single phase AC supply inputs
(EF2/3) for controlling fields up to 32 Amps.
The internal field bridge supply input voltage
rating is 480v AC.
Provision is made for providing an external
field feedback signal and controlling an
external field with user supplied primary
gate pulse transformer drivers.
There is a pulse transformer unit (Product
code LA102800) available at extra cost for
users who prefer not to supply their own
components. It contains all the external
interface components required to combine
the PLXD with the thyristor stack and its
associated Accts (AC current transformers).
It includes 12 pulse transformer networks for
2 or 4 quadrant bridges, an armature burden
rectifier network, and 2 pulse transformer
networks for an external field bridge. The
unit is designed to be mounted on a DIN rail
and all the interface connections are via
screw terminals.