Note: This model only available in 460-480 volt three-phase.

Across International's IHL series 1 kHz to 20 kHz low frequency induction heaters are good for a wide range of applications including deep heat penetration for full hardening processes, steel rod forging, tempering of pressing dies, pre-heating for welding, and melting of metal batches over 4 lbs. They are not limited to ferromagnetic materials, so nonferrous metals can also be used effectively.

There are three major components to the system: the power supply, the compensating capacitor or transformer, and the induction coil or smelting crucible. These heaters automatically adjust to the best resonant frequency for efficient overall heating based on penetration, heating efficiency, operating noise, and electromagnetic homogeneity. Two common low-frequency configurations are melting furnaces with tilt-pour melters and auto-feeding rod heating furnaces for forging.

Induction heating does not involve the external application of heat but rather the internal generation of heat in the workpiece itself. This reduces long heating periods and enables localized, precisely timed heat input with high efficiency.

Safety Features

• Overvoltage protection: machine shuts down when input voltage is over 245V and resets automatically when voltage returns to normal.
• Overheat protection: if the IGBT heat sink exceeds 55C, the machine shuts down until cooling conditions improve.
• Overcurrent and malfunction protections: machine shuts down if components overheat, interfering signals are detected, work pieces short against induction coils, machine failure occurs, coils touch each other, input voltage is too low, or water pressure drops below 29 PSI.

Caution

• Always wear protective gears and goggles when operating the machine.
• Crucibles must remain covered during operation.
• Do not run no-load operation for long periods.
• Circulating water must be pure, clean, and below 45C.
• The machine must be properly grounded at all times.
• Do not use a single-turn coil smaller than 4 inches in diameter.
• Thread tape or related material is prohibited during induction-coil installation.

Main Induction Furnace Specifications and Melting Capacity

The table below outlines the maximum melting capacity for each induction furnace model. Each melting cycle takes approximately 50-60 minutes for a cold furnace and 20-30 minutes for a hot furnace.