martinav (Customer) asked a question.
Best way to connect a general Asco Solenoid to BRX
I have used Murr Elektronik harness for solenoid valves from AD. I believe they contain some protective circuitry in them that keeps power clean and happy. The asco solenoids are simply wires on the coil. I did not see a solenoid specific circuit or relay that I could use on these. BTW, they are 120VAC. Any ideas?
Thanks,
Rod
More info needed.
What BRX model do you have?
What is the current of the valves? ( inrush and maintained current)
You may be able to use the relay outputs of the plc, but you should plan to add an AC snubber to reduce voltage transients and increase the life of your relay contacts.
Hi @martinav (Customer)
Do you have a part number (specifications) on the solenoid that you want to use? The specifications will show the inrush current for the device.
Normally you would just use a relay or triac output card to trigger the solenoid. Ensure that the current is within the specifications of the PLC output card.
DC solenoids are usually equipped with a free wheeling (flyback) diode (Protective circuitry) to handle the inrush.
Regards,
Garry
https://accautomation.ca/
@ADC_PLC_ENG (AutomationDirect) , @Garry (Customer)
I wont connect this direct to the BRX. I'm currently trigger a KPR-SCE-24VACDC-1 relay to trigger the DVD-2AC3A-120A solenoid valve using a SC18-LS110-3 cable. This is with a BX-DM1E-18ER3 PLC.
Not sure what to connect to the Asco valve. I am using a BX-DM1E-18ED23 PLC for this project. Its not a relay PLC, but I fully intended to drive a relay for the valves anyway. I'd rather blow up a $5 relay than a $500 PLC.
Asco valve info:
Model: 8262H109
Watt rating is: 17.1W @ 120 VAC
VA Holding: 40
VA Inrush: 70
Further, if I use the relay referred to above, the contact rating is 6A @250VAC. VA capacity of 1500, right? So, I could use that relay direct connect to the solenoid.
An interposing relay as you have done in the past would be the way to do this. I understand what you are saying about the "flying" leads on the ASCO redhat valve. The valve pulls less than 1 A for inrush and hold in current so the 6A relays should be fine. However if you wish to protect the relay contacts you would need to find an external surge suppressor (snubber) or keep a spare relay and see if you have issues.
We do not really have a product that would work well.
Anyone have a good solution for the supressor??
AD does sell this: ZL-TSD8-120 which might be an option.
But electromechanical relays can stand a fair amount of abuse and for a small coil suppression, while desirable, is often not strictly necessary.