“The voltage must be off” you mean the mains ? The opamp out I am guessing. I would just need the some output either high or low when the secondary are shorted. I could achieve it by adding a diode but wanted a second opinion. The signal is fed into a MCU and with code the MOT would be switched ON. The max weld time would be 500ms with the lowest being 10ms.So, let me get this clear. The voltage must be off, then press the electrodes against the tab, then turn on the voltage?
Does the voltage need to be switched off before the electrodes are removed?
Is the voltage to be applied for a specific time or does the operator decide when the weld is complete?
Agreed.I'd leave it isolated. Depending how your property is wired and your power company operates you might trip a ground-leakage circuit-breaker if you short neutral to ground. In principle they are already shorted at some point. In the USA this is at the consumer panel, but in the UK it may only be at the generator station and there can be several volts between neutral and ground at the consumer end.
As the circuit stands, if there is any spike of voltage between neutral and earth then C19 couples that spike direct to IC6 input."I suggest that the lower ends of C19 and D8 should be disconnected from neutral and connected to the mains earth." why would would it be needed. I mean i don't get it really, would it work ?
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