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直流调速扩展单元
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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