| Author |
Message |
ahmed tolba
Joined: 02 Dec 2006
Posts: 18
Helped: 1
Location: Egypt
|
 27 Jun 2009 13:40 in4004 diode |
|
|
|
|
Hi,
I am working with a fire fighting system control panel, and I have a problem in the panel output.
the out should be connected to a solenoid to control opening the extinguisher as in picture
the diode is connected to prevent transients made by solenoid coil from entering cct.
PROBLEM IS : this diode brings the 24 output to (only 0.6 volts) which is not enough to operate the solenoid????
I can remove this diode ....but what about coil spikes??? need your advise.
[/img]
|
|
| Back to top |
|
 |
Google
AdSense
|
27 Jun 2009 13:40 Ads |
|
|
|
|
|
|
| Back to top |
|
|
GSM Man
Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA
|
27 Jun 2009 13:53 diode in4004 |
|
|
|
|
| If the diode is connected as shown in your schematic is will be reserved biased and should not be conducting. Therefore it shouldn't be dropping the voltage to 0.6v. However, if it is reversed (cathode to negative side of supply) it will be forward-biased and will drop the voltage to around 0.6V. I would check the polarity of the diode and your supply connections.
|
|
| Back to top |
|
|
ahmed tolba
Joined: 02 Dec 2006
Posts: 18
Helped: 1
Location: Egypt
|
28 Jun 2009 7:39 in4004 |
|
|
|
|
but I am sure of the diode polarity and also the sourse,
I wonder if this type of diodes has low break down voltage so it conducts in the reverse direction???
|
|
| Back to top |
|
|
elrayes
Joined: 03 Jun 2008
Posts: 145
Helped: 7
Location: Egypt
|
10 Sep 2009 2:39 dioda in4004 |
|
|
|
|
try to test the diode to check from diode polarity.
try to replace the diode with another one from the same type or replace it with another diode like 1N4007 or 1N4818.
|
|
| Back to top |
|
|
nandhu015
Joined: 11 Feb 2006
Posts: 628
Helped: 46
Location: Tamilnadu, India
|
10 Sep 2009 2:54 diode voltage in4004 |
|
|
|
|
Possible not due to some other thing and not the diode
Check out the other things
Nandhu
|
|
| Back to top |
|
|
Js_Ong
Joined: 15 Jan 2007
Posts: 40
Helped: 2
|
21 Sep 2009 7:02 in 4004 |
|
|
|
|
Ahmed,
Have you manually check for your solenoid? Is it work when you plug to 24V by manually? Your problem seems like the solenoid already has opened circuit.
|
|
| Back to top |
|
|
