JU Series - Thyristor Regulators

• Compact structure: Compact, lightweight, and high panel installation density
• Options: The options of heater disconnection
  alarm function and current limit function are available.
• Phase control/zero-cross control: The phase control and the zero-cross control are selectable. The running by the phase control at the initial stage and by the zero-cross control at the normal stage is possible.
• Zero-cross control: With the delta-sigma modulation, which controls every 1 cycle, the fine control like the phase control is possible.
• Setting unit (option): Display of various parameters, voltage/current/ power and change of the feedback system are possible.
• Various protections function built-in: The thyristor element is protected by fast-acting fuse melting 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 heat sink overheat.
• Self-diagnosis function built-in: The self-diagnosis function is built in for operation abnormality, Thyristor element abnormality and power supply abnormality.

Phase: Single-phase

Rated current: 10, 20, 30, 50, 75, 100, 150, 200, 250, 300, 400, 500A (to be specified)

Rated voltage: 100, 110, 120, 200, 220, 240, 380, 400, 440VAC (to be specified)

Rated frequency: 50/60Hz (automatic change)

Allowable frequency fluctuation: ±2Hz of rated frequency (±1Hz for performance guarantee)

Working temperature range: -10 to 55°C (0 to 50°C for performance guarantee)

Input signal: Selectable on terminals of 4 to 20mADC (internal resistance 100 Ω), 1 to 5VDC (internal resistance 25kΩ), ON-OFF contact signal, and Resistance signal (10k Ω, manual)

Output range: 0 to 98% of rated voltage

Minimum load current: 0.5A or more (at 98% output of rated voltage)

Applicable load: Resistive load, inductive load (primary side control of transformer, phasecontrol only)

Output control system: Phase control/zero-cross control (selectable depended on models)

Over-current protection: Thyristor gate-off (120% or more of rated current, on built-in or external CT)

Cooling system: Natural cooling for 150A or less of rated current Built-in cooling fan for 200A or more

Other functions: Soft-start, soft-up/down (1 to 20 seconds), soft-start at power failure recovery

Dimension: H150 x W70 x D165mm (for 10A, 20A)/ H352 x W60 x D190mm (for 35A to 75A)/ H325 x W128 x D190mm (for 100A to
250A)/ H495 x W128 x D230mm (for 300A to
500A)

Weight: About 2kg for 10A, 20A, about 3kg for 30 to 75A, about 7kg for 100 to 250A, about 12kg for 300 to 500A

JU Series