milmat1
Member
Anyone know a good source to see some wiring examples of machine safety systems ? Just for reference...
My lower rated systems with low access to danger will typically be something like this.
A couple of twist release e-stop buttons
Maybe a pull cord safety switch etc. All wired to a safety relay such as an MSR from AB,( single function safety relay).
Then the control voltage is fed through the contacts of the safety relay to feed any contactors, The PLC outputs, or actuators etc. So an E-stop function removes power from the controls and all PLC outputs etc.....
Also a set of contacts on the safety relay will feed the STO voltage to any VFD's. So in an Estop condition the VFDs are put into a CAT0 stop..
I would just like to see some examples of safety circuits in use. Especially any that are also using VFD's
My lower rated systems with low access to danger will typically be something like this.
A couple of twist release e-stop buttons
Maybe a pull cord safety switch etc. All wired to a safety relay such as an MSR from AB,( single function safety relay).
Then the control voltage is fed through the contacts of the safety relay to feed any contactors, The PLC outputs, or actuators etc. So an E-stop function removes power from the controls and all PLC outputs etc.....
Also a set of contacts on the safety relay will feed the STO voltage to any VFD's. So in an Estop condition the VFDs are put into a CAT0 stop..
I would just like to see some examples of safety circuits in use. Especially any that are also using VFD's