The simple solution would be for you to use 36V relays insteadīut I've not found 36V versions of the 48V relay from Homann Designesįarnell sell a 24V version that you could use either by connecting a 270 ohm 1W resistor (approx half the coil resistance, 576/2=288) In the Homann design circuit the E stop switch controlles the 48V power supply for the G540 and the 48V relays contact on ERL in parallel with the PB to retain it. The circuit also show the push maintained type buttons, but the method mentioned by John is preferred where there is a N.O. If you bring the main power to the system through two AC conductors then it is much easier to switch and control one AC power source rather than everything plugged into separate receptacles. limit switches or watch dog timers etc, in the case of Mach type controls, an auxiliary contact on ERL could be set up as the E-stop input into Mach to advise an E-stop has taken place.
GECKO G540 POWER SUPPLY SERIES
Here is one example from a old project, if you notice, the control relay ERL has a 24vdc coil and is responsible for switching any 120v or 24v power devices that are required to be off in a an E-stop condition, check the occurrences of ERL contact, you may not need that many, the E-stop string itself only shows a couple of actuators (P.B's) but in fact can have as many actuators you wish in series that would need to initiate an E-stop, such as N.C. You could put the low voltage controls in one boxĪnd power supplies and switch gear connected to the mains in another box This is safer as it avoids having both mains and low voltage wires to the G540 connected to the separate parts of the same E stop switch Your E stop circuit can be powered by a low voltage supply If you used a relay or contactor as in Al's post (the coil voltage being 240V or 440V for UK single or 3 phase supplies)Ģ4V, 50V or 110V coils are available for low voltage control circuitsĢ4V being ideal for new machines with programmable logic controllers Start button has been pressed, until the normally closed stop switch is pressed (or when fitted an motor overload switch opens )Į stop switches can be wired in series with the DOL starters stop switch The low current N/O contact maintains the supply to the coil once the Or in new installations controlled by an electronic soft start control) (over 10HP the motors are started in star connection then after a delay switched to delta using 3 contactors controlled by timers With 3 pairs of normally open high current contacts to power the motorĪnd a a pair of low current N/O contacts for the control circuit The choice of switch for the G540 enable (terminal 10)Ī contactor is basically a very heavy duty relayįor example, a single contactor is found in single phase and 3 phaseĭirect On Line starters that are able to connect a 10HP motor to a
It disconnects the live supply even if the mains wiring is crossedĪs can happen with a non polarised mains plug
The choice of E stop you use will depend on the damage that can be done to you and the machine when things go wrongĪ double pole switch ensures the machine is isolated from the mains supply
To keep the safe low voltage circuits and the mains separate To safely switch the mains supply to the motorsĪnd via the G540's terminal 10 an E stop to Mach 3Īs Al suggested you can use a relay / contactor If you don't have a E stop switch with the correct switches In my case it will be for Mach 3 to switch the spindle motors speed controller on and offīut I'd go for the E stop switch directly controlling the mains supply ( no good if a spindle motor or the psu is emitting smoke signals ) Switch off relay RL-04 to remove the mains supply to any thing connected to the IEC socket
GECKO G540 POWER SUPPLY SOFTWARE
Mach 3 software will stop sending step signals and The enable switch to the G540 terminal 10 is used by many people