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Author Topic: SSR Relay Forward Reverse Help  (Read 593 times)

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Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #20 on: June 14, 2019, 06:10:11 PM »
Yes

And they are only rated at 28v dc output..

Gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #21 on: June 14, 2019, 06:18:28 PM »
I'll assume yes means the inputs measured 5V.
 
What is rated at 28VDC?

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #22 on: June 14, 2019, 08:58:55 PM »
sorry for miscomputation..

No its +5 in and 120 220 volt out, and the max dc output is 28v .
That's what is printed on the relay..

Gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #23 on: June 14, 2019, 09:49:15 PM »
I don't know why the LCD output doesn't work for you, it should.

Your success with operating the relay board from the SSRs and the PoKeys relays tell me the 4 OCx outputs could be used with the relay board. I have attached a wiring diagram.

Quote
one thing I was doing is using a relay to turn on the 120v to the kb controller with m3
You shouldn't turn the 120 VAC on and off with M3 and M4. The analog voltage from the PoKeys starts and stops the drive. You do want a manual switch to turn off the drive during tool change. Don't trust the computer with your fingers.

One of the relay board relays or a PoKeys relay can be used to switch the AC to the coil of the high power DPDT motor reversing relay. Unless you have a DC power supply with extra current I would stick with the AC relay for the reversing.

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #24 on: June 14, 2019, 10:23:21 PM »
Thanks I was also looking at the relay board that pokeys sells but I think its output is rated at 28v dc also

I put a volt meter on the oc output's and wasn't getting enough output volts to power the relays, I will test it again..
I though they may be pwm like the spindle output, but most likely i'm wrong.. but there on the same isolated output connectors as the spindle.

there is a toggle switch plus a push and locked when closed, on and off power switches to spindle.
   
Gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #25 on: June 14, 2019, 11:04:37 PM »
The opto-isolated OC outputs do not supply voltage. Much like a relay contact, their two pins are together when switched on. Wiring them as shown in the diagram will connect the input of the relay board  to ground, changing it from 5V to 0V.
The OC outputs are for motor controllers that have inputs for direction and enable etc. Your basic controller doesn't have them.

DC Current through a relay contact is harder to interrupt than AC current, hence the lower voltage rating.

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #26 on: June 15, 2019, 07:13:59 PM »
Thanks

The OC'S work great so I now have at least 8 outputs I can control the relays with..

Thanks gary

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #27 on: June 16, 2019, 01:37:53 PM »
Does this look doable ?
SSR Relays
Re: SSR Relay Forward Reverse Help
« Reply #28 on: June 16, 2019, 02:18:57 PM »
Hi,
because you have four independent SSRs you have in effect a DPTT (double pole triple throw relay) where  with all four
SSRs off results in the motor being off.

Is it strictly necessary to have a fifth SSR in the AC input circuit?

Craig
My wife left with my best friend...
     and I miss him!

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #29 on: June 16, 2019, 02:26:46 PM »
Do you keep a fire extinguisher close by?

The current rating is a marginal and if you ever fire both sets of relays at the same time lots of smoke will be let out.

Commercial solid state devices to do the job this way are uncommon and expensive. It's far safer to use a mechanical relay.

As I said before, not knowing how much DC power you have to spare, use a relay to switch AC power to the coil of a DPDT relay.