On 1/10/26 02:49, Viesturs Lācis wrote:
sestd., 2026. g. 10. janv., plkst. 04:38 — lietotājs gene heskett
(<[email protected]>) rakstīja:
On 1/9/26 18:26, Viesturs Lācis wrote:
What are possibilities to drive
this SSR with 5i24's pin:
https://www.tme.eu/en/details/ssr-2528zd3/one-phase-solid-state-relays/qlt-power/
From the documentation I understand that control signal at 5VDC will draw 13mA
I'm doing it 5 or 6 times in my setups, among other things controlling
the 255 volt power to 3 machines & high voltage bed power to 3 printers..
Hello Gene!
Just to make sure I understand correctly - you have 5 or 6 setups
where you control SSR relay directly from FPGA board pin without any
intermediary hardware?
Yes, using that basic SSR style or higher voltage/amperage similarly
packaged versions. Available for up to 600 volt and 60+ amps. Originally
made by Crydom for tv studio lighting dimmers back in the days when we
used huge banks of 1500 watt tungsten lamps. There they were driven by
CD4000 series cmos logic. Many imitations have popped up in the
intervening decades. Some of the early Chinese stuff was pretty bad,
but in the last decade or so have gotten pretty good. In my machine
power switching I've lost only one to a lightning strike on the pole
carrying the 50kw tranny that feeds my house and 3 others. That single
failure was about a decade back up the log. Any output from any mesa
card or breakout board can drive them. I use 5 of them on my Go704 mill
as a soft start to control the inrush of charging a rediculous amount of
UF in the motor supply.
If switched straight on, drops a 30 amp breaker in service, so I turn it
on thru a 50 ohm 200 watt R for 4 seconds, then turn them on fully. 4th
axis supply uses 2 more. And it all runs on a 20 amp breaker now. On
that mill, which has a 1hp spindle motor, rated 9.7 amps at 90 volts,
I'm hitting it for around 3.5 actual hp, still on OEM brushes after 15+
years. Higher DC and amps in supply. One of Jon Elsons PWM-Servo's
does the control. Set for 18 amps max under LR conditions. My calc says
that's 2268 watts locked rotor., OEM is 873 watts LRA. Only time it
approaches that is while rigid tapping with bigger taps in steel.
Does it matter for FPGA board if the pin is sourcing or sinking
current? It would make sense to me to wire it on GND side for "active
low" because pin will be high when PC is turned on and LinuxCNC
starting up and joints being homed etc.
That's correct for the electronics best practice. Most TTL/FPGA logic
can sink ( > 20 mills ) lots more current than they can source ( < 10
mills).
So that is how I write my hal codes. Switch the - terminal in *.hal
file, put solid 5 volts on the + terminal. Invert the logic in the *.hal
file so a logic zero = ON.
Viesturs
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Cheers, Gene Heskett, CET.
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