Product Description：
SoftStarterPro's LS-SCR-320KW is a voltage regulator SCR using 32-bit dual-core MCU control with built-in PID closed-loop regulation, engineered for industrial applications requiring precise, multi-mode power control. It shares the same 320-450KW enclosure size within the LS-SCR series, which scales from 16KW to 800KW with unit size increasing by power tier.
Key Features:
- Dual-core MCU control: 32-bit microcomputer with built-in PID closed-loop regulation, 100% linear output
- Six control modes: Constant voltage, constant current, constant power, open loop, cycle zero-crossing, fixed-cycle zero-crossing
- Adjustable PID control: Proportional, integral, differential coefficients, keypad configurable
- Dual-channel signal input: Current input (AI1: 0-20mA/4-20mA) and voltage input (AI2: 0-5V/0-10V/potentiometer)
- MODBUS RTU communication: Remote monitoring and output control
- LCD display: Four-line display, customizable to show input, output, voltage, current, power
- Six-way protection: Phase failure, thyristor breakdown, overcurrent, load disconnection, radiator overheat, three-phase current imbalance
- Dual cooling fans: Two built-in DC cooling fans with heatsink for continuous operation
- Parameter save + one-key restore: Retains settings after debugging, factory reset available
- Fault record: Stored fault history, viewable/clearable via keypad
- Customizable output relays: Two relay outputs, function assignable via menu (fault signal or run status)
General Technical Parameters:
| Parameter |
Value |
| Rated Capacity (Model Designation) |
LS-SCR-320KW / 480A / 380V |
| Recommended Load (Resistive, with 1.3× safety margin) |
≈246.2KW / ≈369.2A — do not exceed this value in continuous operation |
| Control Modes |
Constant voltage / constant current / constant power / open loop / cycle zero-crossing / fixed-cycle zero-crossing |
| PID Parameters |
Proportional, integral, differential coefficients (keypad adjustable) |
| Signal Input |
DC 0-20mA / 4-20mA (AI1), 0-5V / 0-10V / potentiometer (AI2) |
| Communication |
RS485, MODBUS RTU |
| Protection Functions |
Phase failure, thyristor breakdown, load overcurrent, load disconnection, radiator overheat, three-phase current imbalance |
| Display |
LCD, 4 lines, customizable parameter display |
| Cooling |
Heatsink + dual built-in DC cooling fans |
| Enclosure Protection |
IP20 |
| Control Method |
Terminal control, keypad control, communication control, or keypad + communication |
| Minimum Test Load |
>0.6A |
| Operating Temperature |
0~40°C (max 60°C; above 40°C, rated current derates 1.2% per °C) |
| Humidity |
≤90% RH |
| Warranty |
18 months |
Application:
- Industrial heating equipment
- Resistive load power regulation
- Process heating systems
- Power regulation for silicon carbon rod / silicon molybdenum rod loads
Note:
- Ratings are based on 380V three-phase input. Custom configurations for 220V, 440V, or 480V are available upon request.
- Not suitable for inductive loads such as motors or transformers — designed for resistive heating loads only.
- Unused terminals must not be connected.
- Cut off input power before servicing — SCR output remains charged even when switched off.
- Load must exceed 0.6A for proper operation; testing without connected load is not valid.
