WARNING:
Make sure that the
circuit breaker is turned off before
adjusting heat station components.
Loading resonant capacitors onto the RHS capacitor bus.
Figure 2: Changing the capacitors
4.2. Tuning.
This section provides the procedures required for the final tuning of the heat station for a
specific heating coil and load. The aim of this exercise is to have the unit operating at full
power at the desired frequency.
1. With the coil connected to the output and capacitors loaded in the RHS, remove one of the
cable connections from an input block. Connect an oscilloscope to the output of the
Remote Heat Station. Momentarily touch a DC voltage source (about 85VDC) to the two
leads of the RHS. The scope should show the voltage “ringing” down. Measure the
frequency of this ringing. If this frequency is higher than the induction power supply can
function, add more capacitance in the RHS. If the frequency is lower than the induction
power supply can function, lessen the capacitance in the RHS.
2. Once the frequency is acceptable, reconnect the cable lead to the input block. Install a
smaller capacitance on the capacitor rail of the power supply and adjust the series
induction to a middle position. Turn on the power supply at low power.
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