- Rectifier cabinet (Input circuit breaker, input current meter, voltmeter (with selector switch) and input voltage indicating light)
- Inverter and output cabinet (The inverter is made of single phase MOSFET inverter bridges connected in CFI. The power of single-phase bridge is 60KW/120KW. Five such inverter bridges are provided to obtain the rated power
- Closed circuit water cooling system (The rectifier cabinet and the inverter output cabinets are interconnected with copper cables)
- Operator desk
- Mechanical adjustment device (It is used for installation and positioning of the inverter output cabinet. The adjustments are carried out manually )
- Output Induction/Contact Leads unit
- PLC system for complete control of the H.F. Welder and perfect inter locking
- LCD man-machine interface for extensive fault information display
- High/low frequency protection functions of the inverter to avoid open-circuit and short-circuit between the work coil and pipe.
- Modern fixed-angle control technique of the inverter control to adjust to the frequency change of the welder.
- Phase-locked loop technique of the inverter to provide higher dynamic response and wide frequency tracking
- 460V DC at the rectifier out put provides high overall efficiency and input power factor.
- DC over-current, AC over-current and over-voltage protections provide highest level of protection for each inverter bridge, which ensures its fail safe operation.
Site Conditions for installation
- It must be Installed inside a covered area with proper earthing (cross section area 4mm2, grounding resistance ≤4Ω.
- Altitude not over 1,000m
- Ambient temperature 5~40°C
- Air humidity < 85%.
- Vibration free with clean environment
- The place should have reasonably good ventilation
- Nominal power : 350kw
- Rated DC power : 420kW
- Rated DC voltage : 450V
- Rated DC current : 840A
- Overall efficiency : ≥85%
- Output power : 350kW
- Design frequency : 250~300kHz
- MOSFET inverter : 60kW×2
- Tank circuit output method : Using output from secondary of matching
D-2 Requirements of Power Supply
- Nominal power : 350kW
- Rated DC power : 420kW
- Input power factor (cos φ) : φ≥0.85
- Power capacity : 402kVA
- Voltage supply : 3-phase 400V/50Hz
- Input current : 840A
D-3 Recycling Soft Water Cooling System
- Cooling capacity : 1,16,100Kcal/h
- Output water temperature : ≤40°C
- Water flow : 18m3/h
- Water pressure : 0.15~0.2Mpa
- Rated power: pump motor : 7.5 kW.
- Rated voltage : 3-phase 380V/50Hz
- Noise : ≤85dB