Help on fault finding on a C3-31 Hammer combination machine

[OMLCNC]

The readings are what I suspected you'd get, especially with a multimeter.
What about the input voltage to the transformer?
If they also drop, what about the main supply into the machine?


What I can't really make out from the wiring diagram, is are the top right wires, and lower left side wires on the braking module directly connected (I'm guessing each wire has a separate terminal, but are the terminals paired together? - A photo might help)

However, I think if you remove the link between R8 and 4 on the contactor, it'll be enough to break the circuit for the braking.
Do you have a diagram for the selector switch, as it would help understand exactly what's going on?

Assuming the selector switch is just a switch, with no relays/contactors to control things, then the key to the braking circuit is how the 3rd leg is handled. It is controlled via the auxiliary contact (other two legs go via the main contacts, with the third main contact used as the latch for the start button - the start button second contact also bypasses the aux. contact, which I assume also ensures the braking module remain inactive until the contactor is fully energised), but goes to the braking module, before heading to the selector switch, unlike the other two legs that go straight to the selector switch.
The braking module is also connected to the 2nd leg output from the contactor (terminal 4), via the NC contact (R8), so when the contactor is energised, the braking circuit is broken, but once the contactor is de-energised, the braking module is connected to the 2nd and 3rd legs on the motor side. By breaking the 4/R8 link, it should prevent the module from braking (which I'm assuming is done either via DC injection braking, or controlled shorting of the legs).

See pictures - Yes the wires are connected on the PCB board, paired together as you thought, I checked them with "the tester"
Other red wire goes to 24 and brown to R7

Also see pictures of rotary switch, you may be able to work out how it works. It could be the issue if you see my other post to Mr Eddycurrant