I have a safety systems (ESD) which drives a solenoid valve but there is a barrier in between (MTL5521).
Solenoid valve is rated 24vdc with a resistance of around 201 ohms. The problem is once i have a command to trigger the SOV the voltage drops at around 11VDC, i am planning to add resistor in series to raise my voltage drops once triggered. any advice. TIA

 

JARIS RAMOS...
Welcome to Control Automation!
Regarding the Problem:
1. What is the DC supply voltage?
2. What is the Solenoid Current Rating?
3. What is the current rating of the Barrier?
5. Is the valve used to interrupt air, water, or inert Gas?
Regards, Phil Corso, PE (Semi-retired)
[email protected]

 

@JARIS RAMOS,

I would add to the list:

4. Has this configuration/loop been working for some time or is this a recently occurring problem?

 

JARIS RAMOS...
6. Circuit energized, Vc = 24, Vv =11, Vb = 24-11 =13!
7. Valve: Rv = 201, Av = Vv/Rv = 11/201= 0.0547A = 54.7mA!
8. Barrier: Vb =24-11=13, Ab=54.7mA, Rb= Vb/Ab = 237ohm!
To me, current magnitude appears to be ok! But, how does it compare to Mfg Specs?
Regards, Phil Corso, PE (Semi-retired)
[email protected])