Heino Geerdens
Member
Hi guys,
Here' my situation,
I'm using a PILZ PNOZ multi as safety PLC to control all safety related components in a production unit. 2 relay-outputs of the PNOZ are used to switch the enables of a FESTO SEC-AC servo drive.
The SEC-AC is placed in another cabinet about 20M further. Because of dithering the 2 relay outputs of the PNOZ will switch 2 solid state relays in the next cabinet, these solid states will enable the drive.
The problems is that when I reset both PNOZ outputs, the solid state will still transfer the load to the SEC-AC. So the 24V will still be comming thru to the enable inputs. I measure about 0.4V on the input of the solid state, the LED will not show that it is switched on. When i take the solid state out of the housing or disconnect the cable comming from the PNOZ the load goes down, so there's no problems with the housing. One option would be to use a normal relay in front of the solid state but I'm sure there's another sollution such as a transistor. Who could give me another option and maybe explane why the solid state works this way?
Thx,
H.
Here' my situation,
I'm using a PILZ PNOZ multi as safety PLC to control all safety related components in a production unit. 2 relay-outputs of the PNOZ are used to switch the enables of a FESTO SEC-AC servo drive.
The SEC-AC is placed in another cabinet about 20M further. Because of dithering the 2 relay outputs of the PNOZ will switch 2 solid state relays in the next cabinet, these solid states will enable the drive.
The problems is that when I reset both PNOZ outputs, the solid state will still transfer the load to the SEC-AC. So the 24V will still be comming thru to the enable inputs. I measure about 0.4V on the input of the solid state, the LED will not show that it is switched on. When i take the solid state out of the housing or disconnect the cable comming from the PNOZ the load goes down, so there's no problems with the housing. One option would be to use a normal relay in front of the solid state but I'm sure there's another sollution such as a transistor. Who could give me another option and maybe explane why the solid state works this way?
Thx,
H.