12vdc solid state timer-relay

V

voodooracer

Guest
Are the commonly available octal base industrial timer relays (NCC
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vd
coil (input or control circuit) but all the outputs are rated for som
motor HP rating, which I take to mean AC voltage. My load is a 12vd
solenoid (10A draw) that activates a pneumatic cyl., the release o
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlan


--
voodooracer
 
voodooracer;2889204 Wrote:
Are the commonly available octal base industrial timer relays (NCC
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vd
coil (input or control circuit) but all the outputs are rated for som
motor HP rating, which I take to mean AC voltage. My load is a 12vd
solenoid (10A draw) that activates a pneumatic cyl., the release o
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc
Click to expand...
Sorry if I sound ignorant of some basic electrical knowledge, but i
all honesty, I am. I have learned long ago that the only dumb questio
is the one that goes unasked. Have learned much on my own, but hav
learned many times more from others. Thanks again for any help you ca
give


--
voodooracer
 
On Jul 10, 5:44 am, voodooracer <voodooracer.a41e...@diybanter.com>
wrote:
Are the commonly available octal base industrial timer relays (NCC,
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vdc
coil (input or control circuit) but all the outputs are rated for some
motor HP rating, which I take to mean AC voltage. My load is a 12vdc
solenoid (10A draw) that activates a pneumatic cyl., the release of
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc

--
voodooracer
Click to expand...
HP is commonly about 745 Watts, watts = volts x amps, so you can
figure it out if you can multiply and divide.
 
voodooracer wrote:
Are the commonly available octal base industrial timer relays (NCC,
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vdc
coil (input or control circuit) but all the outputs are rated for some
motor HP rating, which I take to mean AC voltage. My load is a 12vdc
solenoid (10A draw) that activates a pneumatic cyl., the release of
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc
Click to expand...
Easiest is to put a cap across the relay, adjust the value of the cap to
hold the relay for the extra time you need.

If you want precision, then use a 555 timer kit to drive the relay.

Or you can do some research, and scrabble up a 555 delay circuit yourself.

John :-#)#

--
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
 
On 7/10/2012 10:49 AM, John Robertson wrote:
voodooracer wrote:
Are the commonly available octal base industrial timer relays (NCC,
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vdc
coil (input or control circuit) but all the outputs are rated for some
motor HP rating, which I take to mean AC voltage. My load is a 12vdc
solenoid (10A draw) that activates a pneumatic cyl., the release of
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s, max
adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc





Easiest is to put a cap across the relay, adjust the value of the cap to
hold the relay for the extra time you need.

If you want precision, then use a 555 timer kit to drive the relay.

Or you can do some research, and scrabble up a 555 delay circuit yourself.

John :-#)#
Click to expand...
You have at least two problems.
Whatever you use to drive the relay needs to withstand the inductive
kick when
you turn it off.
To fix that, you add a diode or some kind of snubber. But what does
that do?
It causes the current to continue flowing in the relay until the energy
is dissipated in the coil resistance and/or snubber. That keeps the relay
closed for some period of time.

Same thing happens on the contact side. You need some kind of snubber
to keep the inductive kick of the solenoid from arcing the relay contacts.
Causes more delay for the same reason as above.

You can get a rough estimate of the amount of extra delay
from
Td = L/R where L and R are the inductance and DC resistance of
each of the coils involved.

Bottom line: 10ms is kinda short for
a reliable time delay for a mechanical relay.
 
You could use the timing relay to drive a conventional DC rated relay
which in turn would activate the solenoid.

And see the section on "Protection diodes for relays"
at http://www.kpsec.freeuk.com/components/diode.htm



On 7/10/2012 4:44 AM, voodooracer wrote:
Are the commonly available octal base industrial timer relays (NCC,
Dayton, ect.) compatible with a 12vdc load? Can find listings with 12vdc
coil (input or control circuit) but all the outputs are rated for some
motor HP rating, which I take to mean AC voltage. My load is a 12vdc
solenoid (10A draw) that activates a pneumatic cyl., the release of
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc
Click to expand...
 
'Bennett Price[_4_ Wrote:
You could use the timing relay to drive a conventional D
rated relay
which in turn would activate the solenoid.

And see the section on "Protection diodes for relays"
at 'Diodes' (http://www.kpsec.freeuk.com/components/diode.htm)



On 7/10/2012 4:44 AM, voodooracer wrote:-
Are the commonly available octal base industrial timer relays (NCC,
Dayton, ect.) compatible with a 12vdc load? Can find listings wit
12vdc
coil (input or control circuit) but all the outputs are rated for some
motor HP rating, which I take to mean AC voltage. My load is a 12vdc
solenoid (10A draw) that activates a pneumatic cyl., the release of
which I need to time delay (delay on break).
If not, does anyone know of a combo timer-relay (min.adj. .01s,
max adj. 5s) that will work in this app.?
Have done a forum search, but did not find an answer.
Many thanks in advance for any suggestions or advice.

Keith LeBlanc



-
Click to expand...
Thanks for all the replies and advice, great info! That link to th
electronics club was just what I need! Will be spending lots of tim
there in my endeavor to become more "electronical".
Thanks again to all.
Keith LeBlan


--
voodooracer
 
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