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P – Power transmitted
Shows the current device power output in Watt, which approximately (after deducting loss in cable
and heating head) matches the power or energy introduced to the material being heated. It is thus a
parameter directly related to heating speed and temperature. This transmitted power increases with
growing bond (decreasing gap) between the heating coil and the material.
Po – Output power
Related to inverter output power and shown in VA (volt-amperes). It is the so-called apparent power.
It is directly related to the power or intensity of the magnetic field that the heating coil produces. When
the bond between the induction coil and material decreases, or when heating less magnetic or non-
ferrous metal materials, this output power has to increase in order to maintain the same amount of
energy or heat introduced to the material, increasing the loss in turn. Increasing output power can
achieve higher transmitted power, enabling heating of non-ferrous metals, for example.
PF – Power Factor
This indicates the relative quality of the heating induction circuit and is directly related to the bond
between the induction coil and the material, making this parameter very useful for selecting the
optimal coil. The closer the number to 100%, the higher the efficiency of heating energy transmission
to the material, and vice versa. Generally speaking, if PF=100%, all the energy goes straight into the
material and the heating has maximum efficiency. With lower PF, only a part of the energy is
transmitted into the material and part oscillates in the coil
The PF is the highest with a focus adapter, applied tightly to a thick material. Moving away from the
material quickly reduces the PF. For open coils, the more accurately the coil sits on the material and
the smaller the gap between the coil and the material, the higher the PF and the more efficient the
heating. The recommended gap is approx. 2-5 mm. With smaller gaps, heat from the material being
heated is transmitted into the coil, resulting in a faster device overheating.
Frequency „FrE“
The current heating frequency, which should be within 25-40 kHz with a correctly selected coil,
depending on the load and the material being heated. If it deviates significantly, the device displays a
warning, meaning that the user should use a more appropriate coil. If the frequency exceeds the limit
values, the device turns itself off and reports an error.
Output current
Indicates the current delivered by the inverter to the resonance circuit in Amperes.
Input current
Indicates the current consumption from the power line in Amperes.
Input voltage
This is the current power line voltage in Volts.
Cooling temperature
Indicates the average temperature of device components in degrees Celsius.
Limit
Indicates power or parameter limitation, if any, during the heating. For example, if the user sets the
desired power to 3.5 kW using an inappropriate coil, the device will not only display a low power factor
(PF), it will also indicate a duty-type limitation at the output, meaning that the inverter cannot deliver
any more energy. Alternatively, if the user sets a current limit at the input to, say 10A, the device
reports that the power is limited by the input current. If heating proceeds correctly and in the optimum
band, the device will always display “---”, meaning that the device is not limited by anything.
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