Single-phase JU0 pages

THYRISTOR REGULATOR

JU SERIES
JU series small and lightweight thyristor
regulators for single-phase loads are
characterized with high panel installation
density.
Two control systems, a phase-angle firing
system and a zero-cross firing system, are
built in and can be changed by remote
contacts signal.
In the phase-angle firing system, feedback
types of voltage, current and power, and
no-feedback type are selectable depending on
heating characteristics of heaters.
Three kinds of input signals, 4 to 20mADC, 1
to 5VDC and ON-OFF contact signal, can be
changed by terminal connections. Options of
heater disconnection alarm function and
current limit function are available.
The rapid fuse is built in all models and the
current transformer built-in type is also
available.

FEATURES
Compact structure
Compact, lightweight and high panel installation
density

Setting unit (option)
Display of various parameters, voltage/current/
power and change of the feedback system are
possible.

Options
The options of heater disconnection alarm
function and current limit function are available.

Various protections functions built-in
The thyristor element is protected by melting of
the rapid fuse for short-circuit of load, and by
gate-off for over-current. For models with a
cooling fan built-in, alarm is activated and output
is stopped for abnormal heat-sink temperature.

Phase-angle firing/zero-cross firing
The phase-angle firing system and the
zero-cross firing system are selectable. The
running by the phase-angle firing system at the
initial stage and by the zero-cross firing system
at the normal stage is possible.

Self-diagnosis function built-in
The self-diagnosis function is built in for
abnormal operation, abnormal thyristor element
and abnormal power supply.

Zero-cross firing system
With the delta-sigma modulation, which controls
every 1 cycle, the fine control like the
phase-angle firing system is possible.

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PSE-316