OK, time to see inside the bottom section of the unit where the work happens
The modules and transducers seem decent quality but I am disappointed with the quality of the cable management. Maybe it is because i m used to seeing cables properly laced together but the cables in this unit looks dis-organised and messy. I will address this when the unit is confirmed fully working.
Description of what is shown in the pictures.......
240V mains enters the unit at the rear. It is dual gang switched and fed to a EMI filter. The filter feeds power to the rear mounted "LCDpanPS" PCB.
The "LCDpanPS" PCB contains several relays, a transformer and regulators. It looks well made. There are low voltage and high voltage interfaces on the PCB. The high voltage outputs provide power to the High Frequency generator, the heater and the fan. Each has its own output port. The low voltage ports connect to two cables that go to the front panel PCB in the lid. Pin identities have yet to be established. One pair of low voltage pins were easily traced and found to power the MagLoc that holds the lid closed during operation. I will likely disable that for my usage.
The heater comprises two PTC heating pads mounted on the front side of the fluid tank. They share a common neutral feed but their live feeds are slightly different. One goes directly to a bimetallic over temperature protection device mounted on the bottom of the fluid tank, whilst the other connects to the same point, but via a small blue 'pill' shaped device mounted on its pad surface. Why both pads do not have this 'pill' device I am not sure yet. I suspect it is another temperature control device but need to investigate further. The bi-metallic safety cut-out is fed with 240V from the "LCDpanPSU" and I would expect this to be a straight forward relay controlled heater feed.
The temperature sensor is a small 2 wire device attached to the right side of the tank (viewed from the front). Its wires connect to one of the cables gong to the front panel PCB. The type of temperature sensor has yet to be established.
A water presence sensor is also present in the side wall of the fluid tank (yellow wire).
Now to the High Frequency generator that drives the 4, yes FOUR, piezoelectric transducers. The HF generator is fed with 240V from the "LCDpanPSU" PCB, presumably under the control of one of the relays on that board. The output drive for the transducers is a pair of wires that feed to all four transducers connected in parallel. The drive line is marked "HF" on the PCB. The HF PCB itself is shrouded in a 'rain-coat' so was not closely inspected. it contains a large heat-sink with power transistors mounted on it, and a large HF transformer to drive the transducers at high voltage.
There is a single thin blue wire connecting the HF generator to the front panel PCB via one of the multi-core cables that connect to the lid assembly. The function of this cable is not proven but it is one of the following
1. HF generator on/off
2. HF Generator power output control
3. HF Generator frequency control
4. HF Generator operation monitoring by the MCU to identify a fault condition.
The lower unit is equipped with a powerful fan to circulate air around the tank and electronics.
All in all a nice setup, just let down a little by the wiring management, or lack there-of !
I will upload some pictures later. For now, a quick view with the bottom plate removed.
Enjoy the pictures
Fraser