sizing power supply to operate 24V solenoids

[DG]

Hello All,

I'm trying to build a small control panel to operate a series of 24V
solenoid valves. A maximum of 2 valves would be working at any given time,
how would I size the power supply. (120 VAC supply).

Any suggestions on power supply manufacturers? Any with built in fuses?

thanks,

Darryl

 

[sQuick]

Hello All,

I'm trying to build a small control panel to operate a series of 24V
solenoid valves. A maximum of 2 valves would be working at any given time,
how would I size the power supply. (120 VAC supply).

Any suggestions on power supply manufacturers? Any with built in fuses?

thanks,

Darryl

Can you get a data sheet from the valve manufacturerers?
This would give you the "Pull In" & "Hold On" Currents,
you will need these to accuratly gauge the size of psu required.

Also are they 24dc or 24ac?

sQuick..

 

[Ross Mac]

The solenoid valve will have a coil resistance, or operating current
specified.

Double the current to get the maximum current needed.

Or halve the resistance and divide 24 by that to find the maximum current
needed.

Double it. That should give you some margin in case you change your mind
as to how many valves work at once..

And buy a supply with that 24 volt output current capability.

The supply will probably come with some form of overload protection - such
as a thermal fuse on the transformer. But you could use a car inline
fuseholder, with a suitable fuse.

You may want to think about transient/back-emf protection for when the
valves are de-activated. It will be an inductive load and your switches/
relays will need to be rated for that.

As to manufacturers - pracatically anything will do. Unless this is safety
critical, in which case it should fail-safe and possibly would need to
allow for protection against single point failure.

Don't most solenoids come with protection from back emf built in?...that
would be a diode of course....Ross