The PL/XD 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 PL/XD provides gate drive pulses for driving user supplied pulse transformers with primary pulse current
up to 1.5 Amp. See also 13 Pulse transformer unit (LA102800).

       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 PL/XD.
　

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 PL/XD 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 independant 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. See also13 Pulse transformer unit (LA102800).
       

Comprehensive details are included in this manual to assist the user in designing the external interface.
       

All transformer components (pulse tx, acct) that interface with high voltage circuits must have an isolation
voltage of at least 4 times AC volts plus 1000V.
       Eg for 480 volts AC, isolation voltage rating must be at least 2920 Volts.
       Also the interwinding capacitance must be as low as possible and not in excess of 10 picofarad between
primary and secondary.
       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
       PL/XD 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 plug on screw terminals. See 13 Pulse transformer unit (LA102800).

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