adccommunitymod (AutomationDirect) asked a question.
DL06 Inputs, 24 VAC
Created Date: June 24,2005
Created By: mradler
**** This post has been imported from our legacy forum. Information in this post may be outdated and links contained in the post may no longer work.****
I'm considering the DL06 for a system that has varying input voltages from site to site. As far as I can tell, the DL06 handles them all except 24vac. Do you guys see any problem with using a bridge rectifier on the inputs to convert 24vac to dc? This would not be for high speed inputs, just basic on/off where 250ms is fast. Maybe even a half wave rectifier would work? I would really like to avoid adding relays. Thanks for any wisdom!
Created Date: June 24,2005
Created by: mradler
I'm considering the DL06 for a system that has varying input voltages from site to site. As far as I can tell, the DL06 handles them all except 24vac.
Do you guys see any problem with using a bridge rectifier on the inputs to convert 24vac to dc? This would not be for high speed inputs, just basic on/off where 250ms is fast. Maybe even a half wave rectifier would work?
I would really like to avoid adding relays. Thanks for any wisdom!
Created Date: June 24,2005
Created by: Tech Guy
Really the only thing you need is one with 24V DC inputs and a 2.4K ohm resistor. You will need to add the small bit of ladder below to debounce the inputs.
__________
X0 | |
--|/|--------------| TMRF T0 |
| K3 |
|__________|
X0 T0
--|/|-----| |------------(RST C4)
X0
--| |--------------------(SET C4)
Created Date: June 24,2005
Created by: timyoung
What's the max voltage spec on the 24vdc inputs? I could be wrong here but I'd think rectifying a 24VAC RMS signal will give you a peak voltage ~ 32V.
Created Date: June 24,2005
Created by: Tech Guy
Which explains why you need a 2.4k ohm resistor to bring the voltage back to a safe level.
You really don't need a rectifier. The PLC input will take care of that for you. Take a look at the schematic.
Created Date: June 24,2005
Created by: mradler
Great, thanks for the info!