I have an eletrical cabinet with five 230 VAC signals to monitor (after 5 contactors/differentials). They are all the same phase of a 3 phase system.
I take the N of that phase at the input of the cabinet, and the five L throughout the cabine.
I connected the signals to a 230VAC analog GIRA input module on KNX.
Now when I switch of a contactor, the loss of voltage is not detected. I checked and the reason is : there is a 'residual' voltage of 100~130 VAC on that L. Probably induced by the many wires and common paths in the cabinet/installation. But I'm not sure about that.
The input module spec indeed states: 0-7V is low 7-250V is high. So it functions correctly.
Product page with datasheet link: https://katalog.gira.de/en_GB/datenblatt.html?id=658747&car=1
Question:
- how to get these 5 line voltages in, without induced voltage?
- or what is the best way to connect?
Should I put a coil around the wire before the module to prevent voltage to raise over 7VAC?
Or should I put an optocoupler or relais before as interface?
Note: 1) I would like to have minimal power consumption to read the signal (99,9% 'high')
2) the module also takes DC signals, so relais/opto output can be 12VDC
Thanks,
Christof
I take the N of that phase at the input of the cabinet, and the five L throughout the cabine.
I connected the signals to a 230VAC analog GIRA input module on KNX.
Now when I switch of a contactor, the loss of voltage is not detected. I checked and the reason is : there is a 'residual' voltage of 100~130 VAC on that L. Probably induced by the many wires and common paths in the cabinet/installation. But I'm not sure about that.
The input module spec indeed states: 0-7V is low 7-250V is high. So it functions correctly.
Product page with datasheet link: https://katalog.gira.de/en_GB/datenblatt.html?id=658747&car=1
Question:
- how to get these 5 line voltages in, without induced voltage?
- or what is the best way to connect?
Should I put a coil around the wire before the module to prevent voltage to raise over 7VAC?
Or should I put an optocoupler or relais before as interface?
Note: 1) I would like to have minimal power consumption to read the signal (99,9% 'high')
2) the module also takes DC signals, so relais/opto output can be 12VDC
Thanks,
Christof