Ursviken Pullmax Optima 130 press brake retrofit with 4 axis backgage

PCW wrote:

If the encoder counts, its unlikely the index would be missed as the hardware
index processing uses the same digital filter as the A and B signals.
 

Thanks for the nudge in the right direction. I took another look at things and discovered my mistake: I was incorrectly watching for index-enable to go high on index. I went and manually set it high and sure enough, on index, it cleared. Problem solved.

Thinking aloud trying to wrap my brains around the ram motion pedal interlocks.

1. The ram must never go down unless the operator steps on the pedal.

2. After an e-stop reset it must 'ignore' the first time he steps on the pedal.

3. There are 6 electro-hydraulic spool valves and two servo valves, plus a tonnage regulator.

4. Homing requires use of the foot-pedal. It is ok for the ram to go up while the foot-pedal is depressed.

All valves must coordinate in the correct sequence or we dead-head the pump and stall the 18kw electric motor like right now. It is already doing that when I power the creep-up motion. Maybe I am opening the servo valves too far in creep up. Probably also the tonnage proportional valve. It appears the creep up hydraulic circuit is flow-limited by an orifice.

Up/down motion is primarily selected by reversing the power on the servo valves, secondarily by routing the flow with the correct combination of spool valves.

Valves 6.1, 7.1, 9.1, 10.1 plus servo valves 4.0, 5.0 drop the ram fast using gravity.
Valves 8.5, 8.1, proportional valve 8.4, and servo valves 4.0, 5.0 provide slow down with tonnage for bending the plate.
This constitutes every single hydraulic valve solenoid coil on the machine. Up occurs using most the same coils in a slightly different combination.

I begin to think this has to happen in hal. I wanted to hardwire that one, but I see it will be really hard to accomplish. On the part of the Ursviken schematic I had sort of figured out does that, upon closer study, I see it strictly only locks out all motion when the foot-pedal malfunctions and commands up and down motion simultaneously. The old computer directly powered the servo valves with an analog h-bridge card; that circuit was interrupted only by e-stop... and NOTE! I see the up-order button for the ram bypasses the e-stop circuit. I think it would be a really good idea to hardwire that feature back in.

Currently, I have e-stop cutting power to all drive systems, including the 18kw pump motor. Now I need to decide whether A: the motors stays running after e-stop so up-order still works; or B: up-order momentarily powers the pump motor to power the ram UP.

I think B makes more sense. Anyone have better ideas, or comments, etc?