Retrofitting a 1986 Maho MH400E

So we press this button once (keep pressing) and the Linux outputs NC ready while the other contact enables the entire machine. Once we press again, the NC ready from the Linux goes off (209 is off) and the machine goes to estop condition. The same button activates and deactivates. Brilliant.

I just tried out that wiring on the MAHO. The Indramat ready relay 7A1 Bb1-Bb2 closes as soon as you switch on the cabinet main switch K1. I was a little surprised by that, but had missed the Phase L1 and L2 going into the Indramat with 1.5mm² wires to pins R and S directly, in addition to the big 6mm² wires going in through the E-Stop Relays. It is shown on drawing 04. So that start wiring we talked about should work fine.

However, I reinstalled the E-Stop buttons S1 and start button SH-1, but the SH-1 is not closing the E-Stop relays. so I couldn't test jumpering terminal 200 to 209. I need to figure out why that isn't working.
Mark

you probably have removed the maho pendant, and the estop on it is not closing the circuit to activate the K1. So the circuit for 7K1, 7K2, 7K3 can’t activate.
John

Good news for the 7A1 Bb1-Bb2

I now understand what the 7S1 switch is doing. When one terminal switch on an axis is triggered, the machine is disabled and the indramat can’t move the axis, but the L1 and L2 going into the Indramat with the 1.5mm² wires, gives the necessary power for the brake to release when the 7S1 is energized manually.

drimaropoylos wrote: you probably have removed the maho pendant, and the estop on it is not closing the circuit to activate the K1. So the circuit for 7K1, 7K2, 7K3 can’t activate.
John

Thanks. Good call. I should have caught that, since I only just pulled that 19X5 terminal block a couple of days ago. Mine had no pendant, but that jumper was on the terminal block. Looks like I need a jumper between terminals 204 and 264 until I build a pendant.



Thanks also for the explanation of the 7S1 brake release circuit.
Mark