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Author Topic: SSR Relay Forward Reverse Help  (Read 25810 times)

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Offline gorf23

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SSR Relay Forward Reverse Help
« on: June 10, 2019, 11:30:40 AM »
I have two SSR relays DC in out,, two screws for in and 2 for out...
can these be wired for forward and reverse to the spindle motor? if so anyone have a diagram.. I'm a little bit challenged on wiring.
and in my mind I would need 4 relays to reverse + an -

Thanks Gary
Re: SSR Relay Forward Reverse Help
« Reply #1 on: June 10, 2019, 11:35:01 AM »
Hi,
you need double pole double throw to reverse a DC motor.

Your SSR is single pole single throw, ie you'd require four of them.

Craig
'I enjoy sex at 73.....I live at 71 so its not too far to walk.'

Offline Bill_O

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Re: SSR Relay Forward Reverse Help
« Reply #2 on: June 10, 2019, 12:54:10 PM »
The inverters we use will not work with a solid state relay to turn on the forward and reverse.
They need a mechanical connection.

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #3 on: June 10, 2019, 01:12:05 PM »
Hi Gary,

While 4 SSRs could be arranged to reverse a DC motor a small misstep will result in lots of smoke. You would need to provide outputs that turns two of the SSRs on for forward and the other two for reverse. The motor must be off when the switch is operated, both for electrical and mechanical reasons.

The best option would have been a DC drive with built in reversing but apparently you already have a non-reversing DC drive.

Otherwise a double pole, double throw relay (DPDT) is my recommendation. This still leaves you with the responsibility of making sure the motor is stopped when the relay is operated.

If it is not required to have the CNC controller reverse the motor a manual DPDT switch will do. If you want help selecting a suitable switch or relay let us know what part of the world you are in or which suppliers you prefer. Information about your controller would be needed to select the right relay coil voltage.
https://rollertrol.com/images/schematics/switches/DC-motor-reversing-switch-schematic-wiring-diagram-285x275.jpg

The link below is an example of a Drum switch for 3 phase power in an enclosure. Anything you do needs to be enclosed and mounted so a cheaper switch could cost more in the long run. Use the two sections of the switch that cross when the switch is reversed.

John

https://www.ebay.com/itm/Drum-Switch-Forward-Off-Reverse-Motor-Control-Rain-Proof-Reversing-60A/162858118863?_trkparms=ispr%3D1&hash=item25eb19aecf:g:GfIAAOSwsZJaYFmX&enc=AQADAAAB4KX%2FKt4E1xf3SDqEdBclaYZ10vu%2BpDAG5CNJxeT9K2jqgB5ozPPGVc9QXjiOOkPV2%2Bb1IYKwX8L7%2FswbEIjqQZp%2B9TLM6qrwO9fZV5sXV7xoo2jQSsTgDy0jMKSCGPWCuCl85e5rmc4kUqIOj1S%2F1v7dtLxSJD2BI5sXEFx32FJJYn9ywNTqrUY%2BAw%2BhaIbmupi4y7ua9smU00%2F5JgTsaGnM7A0iPZkZWnMGd9h5IpxgNvOz%2B%2FdbYqrxaEdPPTEnm1b8rUogp66S6U8r7jA6uApxZCLawDgpcpYOstqn5nlusbJaK797Dn6QULK7wE45hzxtiu6qHmmOtGNUGoY31W77ekSmGwl7d%2FzKBRJp0GKUi7RF7dPtrPt8PYxVob23Zx7YKYkCk4vrFPoHAHT7WTg1yoEVrB6dCUHGMww6BZnFh0XYavO5kX%2FKhRRcmTgss2uMYGkfObNoCOErvqYd%2BLzn6N8MBRBlblkeu%2Fcv%2BxjL1ew1mZiRZIHLjrY156imXKFWio3XSD2BiMR%2F%2F0Z6znZ3ALMkGgXmYfqgGT8UAei0meQA5AKq8fKrFiyGVOBxLJU4jdwQqdkiCjnWq8zFaTJAyF9ssYmuh374N%2B7JvllJeUtPagGKiZ0n%2FYo4Clfppw%3D%3D&checksum=162858118863a735ed1c7d04478fb1145156fef0b7e1

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #4 on: June 10, 2019, 01:32:30 PM »
Ok thanks, my motor controller is a KBWS-25D connected manual and also with the computer control have it working with mach 3 4 and also Auggie both with ESS smoothstepper and  pokeys57cnc..

I did think i would need a DPDT relay, I also think i would need two 0f them ?

Have the thing apart right now so just though i would try to get motor to reverse, but maybe to much trouble,
with  Auggie i write my own code to control m3 and m4 so turning off the spindle before switching any relays would be fairly easy, but only works with the pokeys, not sure about mach4 yet.. is m3 m4 hard coded in mach4 ?.


Thanks gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #5 on: June 10, 2019, 03:21:57 PM »
One DPDT relay will do the job.

John

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #6 on: June 10, 2019, 03:53:16 PM »
Thanks the problem i'm having right now is finding a dpdt relay for dc to dc thats at least 0-130dc output 3-32 input...

thanks gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #7 on: June 10, 2019, 04:31:42 PM »
Your mention of 3-32 volts make me wonder if you are thinking about a SSR.
I am suggesting a mechanical relay. If I knew what part of the world you are in, or your preferred suppliers, I could find an appropriate relay.

Assuming you will use 12VDC here is one possibility.
Relay
https://www.automationdirect.com/adc/shopping/catalog/relays_-z-_timers/electro-mechanical_relays/square_-z-_cube_relays,_plug-in,_3a_-_15a_(78x-z-_qxx-z-h78x_series)/general_purpose,_15a_(781_-z-_782_-z-_783_-z-_784_series)/782-2c-12d
Socket
https://www.automationdirect.com/adc/shopping/catalog/relays_-z-_timers/relay_sockets_-a-_accessories/relay_sockets/782-2c-skt

Offline gorf23

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Re: SSR Relay Forward Reverse Help
« Reply #8 on: June 10, 2019, 05:51:54 PM »
Yes i was Thinking SSR, i'm im USA Florida

I am using +5 from the BOB to the relay i have it now just to turn on  the spindle power and flood... it rated enough for the 120v out but dc out is only rated to i think around 30v so that won't work for reverse forward, and its a spst.

thanks gary

Offline MN300

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Re: SSR Relay Forward Reverse Help
« Reply #9 on: June 10, 2019, 08:22:30 PM »
Having only a 5V signal from the breakout board limits my choices. Also I am trying to keep this circuit easy to build.
My solution is to use a SSR as a buffer between the BOB and the relay. Since there is no DC power available for the relay I have selected an AC relay.

The voltage and current rating of a relay is the the combination it can safely interrupt. As you will be turning the drive off before switching the 30 VDC rating of this relay does not apply to your application. Still at $2.50 each you could by a few spares in case an accident causes the relay to operate when power is on.

This supplier is located in Riviera Beach, FL.

Relay
https://www.mpja.com/Relay-DPDT-5A-110VAC-Coil/productinfo/33972+RL/
Socket
https://www.mpja.com/DIN-Relay-Socket-for-DPDT-HH5-Relays/productinfo/33974+RL/
SSR
https://www.mpja.com/10A-480VAC-Solid-State-Relay/productinfo/31931+RL