JU series Thyristor
The 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.
- Compact, lightweight and high panel installation density
- The options of heater disconnection alarm function and current limit function are available.
- 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.
- With the delta-sigma modulation, which controls every 1 cycle, the fine control like the phase-angle firing system is possible.
- Display of various parameters, voltage/current/ power and change of the feedback system are possible.
- 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.
- The self-diagnosis function is built in for abnormal operation, abnormal thyristor element and abnormal power supply.
Additional Info
| Phase | Single-phase |
|---|---|
| Rated current | 10, 20, 30, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1000A (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 25k Ω), 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, phase-angle firing system only) |
| Output control system | Phase-angle firing/zero-cross firing (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) H495 x W260 x D350mm (for 750A, 1000A) |
| Weight | About 2kg for 10A, 20A, about 3kg for 30 to 75A, about 7kg for 100 to 250A, about 12kg for 300 to 500A, about 35kg for 750A, 1000A |
