grnick50
Lifetime Supporting Member
Hello all,
I am planning an application where I have a cluster of conveyor belts (~20) where each on has its own local E-stop. I want to use an ET200sp station near that cluster and connect the E-stops to safety input cards.
Then via Profisafe in another ET200sp I want to have safety output cards that control the motor starters of the said conveyors.
My question is about the possible ways of utilizing the safety outputs.
I see in the documentation that in order to achieve the required safety level (SIL3), two Safety outputs are used to drive 2 power contactors in series.
In my case the motors are in the range of 45-55kW so having double contactors in series is not an option as this would increase the space requirement of the MCC, and space is limited.
What I would wish is for the safety outputs to control small relays in series (3RH2131-1BB40) that will interrupt the control voltage that drives the power conductors. Much like the 3TK28 safety relay.
Could another option be to use the control voltage that is switched by the safety cards as common supply voltage for conventional DOs.
Could another option be to use F-PM and have DO cards at the left of the PM?
Regards Nik
I am planning an application where I have a cluster of conveyor belts (~20) where each on has its own local E-stop. I want to use an ET200sp station near that cluster and connect the E-stops to safety input cards.
Then via Profisafe in another ET200sp I want to have safety output cards that control the motor starters of the said conveyors.
My question is about the possible ways of utilizing the safety outputs.
I see in the documentation that in order to achieve the required safety level (SIL3), two Safety outputs are used to drive 2 power contactors in series.
In my case the motors are in the range of 45-55kW so having double contactors in series is not an option as this would increase the space requirement of the MCC, and space is limited.
What I would wish is for the safety outputs to control small relays in series (3RH2131-1BB40) that will interrupt the control voltage that drives the power conductors. Much like the 3TK28 safety relay.
Could another option be to use the control voltage that is switched by the safety cards as common supply voltage for conventional DOs.
Could another option be to use F-PM and have DO cards at the left of the PM?
Regards Nik