Description
The PR3-E Series of thyristor stacks provides seamless control of three-phase resistive loads using a two-thirds control technique. Control is achieved via a DC signal or manual control using a 5kΩ potentiometer. These burst firing control stacks utilise fast pulse zero volts switching technology to minimise flicker and eliminate RFI problems. The controller also features an auto-reset temperature trip, integral semiconductor fuses, and a heatsink. Designed for natural air cooling, the PR3-E Series offers easy access to signal and power terminals for simple installation.
Key Features
- Seamless Control: Full seamless control of three-phase resistive loads.
- Advanced Switching Technology: Uses fast pulse zero volts switching technology to minimize flicker and eliminate RFI problems.
- User-Friendly: Easy access to signal and power terminals for simple installation.
- Auto-Reset Temperature Trip: Incorporates auto-reset temperature trip for enhanced safety.
- Integral Semiconductor Fuses: Built-in fuses for added protection.
- Manual and Automatic Control: Options for both DC signal control and manual control via a 5kΩ potentiometer.
- Compact Design: Designed for natural air cooling, eliminating the need for additional heatsinks.
- Versatile Applications: Suitable for a wide range of heating and ventilation applications, including HVAC systems, furnaces, ovens, dryers, and hot plates.
Applications
The PR3-E Series is suitable for 3-wire, 3-phase floating-star or closed-delta configured resistive loads. It is ideal for:
- Heating, Ventilating, and Air Conditioning (HVAC) systems, particularly for air curtain applications
- Furnaces
- Ovens
- Dryers
- Hot plates
Technical Specifications
- Power / Current Ratings: 6kW (8A) controlling 2 phases of a typical 415V RMS supply
- Input Voltage: 400V RMS ± 10%
- Frequency: 50/60Hz
- Control Input Options:
- Signal: (using SW3): 0 to 10V DC (standard) / 0 to 5V
- Manual: 5kΩ Potentiometer
- For 4-20mA signal: Set SW-I/V to “ON”, fit supplied 270R (0.25W) across SIG.+/-, and set SW3 to 0-5V
- Alarm Relay Circuit Rating: 2A @ 125V AC Max.
- Fan ‘Switch-On’ Temp: Typically 55°C (For 27kW model only)
- Over-temperature Protection:
- Trip in temperature @ 90°C ± 1°C (LED indicator flashes continuously)
- Trip out temperature @ 85°C ± 1°C
- SW1 = Off – Relay is continuously energized (normally closed); trips in fault condition
- SW1 = ON – Relay is de-energized (normally open); closes in fault condition
- Phase Loss Detection: LED indicator flashes slowly
- Sensor Loss Detection: LED indicator flashes rapidly
- Cable Terminations:
- Phase Power: 10mm² rising clamp terminal block
- Earth: 10mm² rising clamp terminal block
- Remote Supply Auxiliary Alarm (relay): 2.5mm² rising clamp terminal block
- Control Signal: 2.5mm² rising clamp terminal block
- Terminal Torque Settings: 1.2Nm (10mm²) Power terminals only
- Fusing: 16A, High-Speed semiconductor type, ferrule fuse (6mm Ø x 32mm long)
- Max. Ambient Temperature: 65°C (maximum operational)
- Dimensions: 105mm(D) x 193mm (W) x 68mm (H)
- Fixing Centres: 2 x 5mm Ø holes on a horizontal center line at 178mm (W)
