Wire an SSR to a HY-JKM5 BOB
These instructions will show you how to wire an SSR (Solid State Relay) to a HY-JKM5 breakout board. The HY-JKM5 breakout board has an onboard relay (Model HTV6-DC5V-SH) that is rated to:
- DC 14v 20A
- 125V AC 7A, or
- 250V AC 5A
I don’t recommend running an AC current through this breakout board so you’ll need to add an external SSR to be able to control higher voltage devices such as:
- A Router,
- A Vacuum,
- Water Pump, and
- Other devices.
These instructions follow on from “Wire an AC Router to an SSR”, please read them as well.
DDO NOT HAVE YOUR ELECTRONICS, ROUTER OR OTHER DEVICES PLUGGED IN WHILE YOU WORK ON THEM!
Check that you can see the pronged plugs of the router and electronics are not plugged in.
Best practice – hold the plugs in your hand and visually trace the cords back to the router and electronics enclosure. This will confirm they are not plugged in.
1. Solid State Relay – SSR
An SSR is basically an electric switch. It will allow you to use a DC circuit (your breakout board) to turn off/on an AC device (your router for example). SSRs are usually ladled with their amperage capacity and which type of current is used to trigger it and what type of current it can switch. Please make sure the SSR you order ends in DA. The “DA”, as the “D” is first it means the low voltage trigger current is DC, and the “A” being second means it can switch off and on an AC current.
2. DC to DC Converter
If your power supply supplies a voltage greater than 32V DC you will require some form of converter as the relay’s coil voltage is limited to 32V Max. The converter could be 5v if you want to use it to power the BOB or 12v if you intend to run fans or small pumps.
3. Wire 1.5mm or 2.0mm
This will be used to wire the low voltage side of your SSR to your breakout board and power supply (or DC converter).
4. Fork Crimp Terminals
Fork Terminals are used connect wires to screw terminals and are a tidy way to terminate a wire. They are fairly cost effective and can be used by people who don’t have access to soldering equipment.
Small flathead screwdriver
Philips head screwdriver
Unplug Power Cords
Make sure both the extension cord you are going to use for your router and your CNC electronics are unplugged. Visually identify both the male plug ends of your cords and that they are not plugged in to wall sockets, place them on the bench beside you. If I sound like I’m repeating myself, well I am – its important!
Initial Setup of DC wires
You’ll need two lengths of 1.5mm – 2.0mm wire to connect the SSR to your Power Supply. These wires will need to be long enough to travel from the power supply, pass by the relay terminal on the HY-JKM5 board, and, then on to the DC side of the SSR.
One wire will be used for DC5V+ and the other for DC5V-. Colour is not important but if you use red for “+” and black for “-“ it may assist you latter on when fault finding knowing you have used consistent wire colouring throughout your enclosure.
Then strip back the individual wires around 4-6mm each. Give each wire a twist and make sure there are no loose strands sticking out.
This is optional but recommended. Place a fork terminal on one end of both wires and crimp the fork terminals with an appropriate tool. Test by giving both of them a tug to see if they come away, if a fork terminal does come away, dispose of it and start again.