Retrofitting a 1986 Maho MH400E

Every time the 11k7 changes state (from on to off, and from off to on) we need to delay the 11k4 or the 11k5 or the 11k6
John

Thanks John,

I was looking at the spindle inhibit signals input to the control from hardware.



The spindle_Stopped signal on IPC1-23 I understand, as it's state is set by relay 1K7 through the tree of relays controlling the main spindle motor.

There is a second signal, "spindle_and _motion_stopped" signal on IPC1-24, which is set by the Lubriction unit (4A1). This makes no sense to me. Does anyone have any idea what this is about, and what the Phillips 432 used that signal for?
Mark

Marc,
in my MAHO 300 manual it says "A pressure drop in the automativc lubrication system will operate a pressure switch in the main feed pipe thus switching off all feed and spindle drives". As far as I cut figure out, that pressure switch is wired through the pumps terminal.
In my case, the cabin door switches are wired in series.
Nowadays, I would always use a safety relais wired into the main safety circuit, e.g. a PNOZ or whatever is available. In my lathe, the lube-system is directly integrated in the safety circuit. I think there is no right or wrong. PRO: You get a direct feedback minimising the risk to ruin your bedways. CONTRA: If that happens during rough cutting you spoil your workpiece and presumably an expensive cutter without need.

Christian

Thanks for checking that Christian. That makes sense. The topic came up for discussion last year, with low lubrication oil level being an inhibit for the machine coming out of E-Stop. I missed the connection of 4A1 being the lube unit, driving that "spindle and motion stop" input to the controller.

Mark

MAHO added that fourth cam "[Stage]_LEFT_CENTER". (german Links-mitte)

It tells you that you need to rotate CCW to get back to the mid position. However this seems redundant to me, as you can acheive this with only the three main target switches, as below...

This logic should work without the fourth cam:
If the "[stage]_LEFT" pin is high, then your only option is to move CW -->(Reverse pin stays deenergised).
If the "[stage]_RIGHT" pin is high, then your only option is to move CCW - > (need "Reverse" energised)
If the "[stage]_CENTER" pin is high, then you can move either direction...
If the target bitmask for that stage is "[stage]_LEFT", then move CCW - > (need "Reverse" energised)
else
move CW -->(Reverse pin stays deenergised).

SInce MAHO didn't seem to do anything redundant, I must be missing something about this. Can someone please explain the error of my logic?
Mark

You are right they have done this for a reason. With your approach if for any reason the gears are not meshed then the controller have no way to know the position of that gear.
John