Tricky wiring thread

Status
Not open for further replies.

I used many different things. A few Led's, a tester, a roughly 1 amp inductor etc.

I'm telling you if both ends of the relay are connected to the same battery the led on the relay goes off. If you take away one wire on the load end it goes back on. Driving me nuts cause it makes no sense.
 
ke5frf said:
Also, this just occured to me. DC SSRs require a minimum load current to function as well, so "underloading" might be a problem. You may need a parallel resistor with the load if it isn't sufficient.
Click to expand...

could you explain that a bit better, parallel resistor
 
Njguy said:
I'm telling you if both ends of the relay are connected to the same battery the led on the relay goes off. If you take away one wire on the load end it goes back on. Driving me nuts cause it makes no sense.
Click to expand...
Then your battery is nearly dead or too small for the application.
 
Last edited:
Which is it then? First you say:
If you take away one wire on the load end it goes back on
Click to expand...
Do you mean you are connecting the SSR output across the battery without a load? A photo at this point would really help.
 
ke5frf said:
Also, this just occured to me. DC SSRs require a minimum load current to function as well, so "underloading" might be a problem. You may need a parallel resistor with the load if it isn't sufficient.
Click to expand...

Hey I got it working by following your tip. That was it. Never would have suspected it. Thanks man your a life saver.
 
just post all the values and specification of the supply etc as others requesting then for sure you will get a congrete answer from any one, also make sure your connections are not lose any where, or you use a common wire and split it for both modules.
 
Alright I will in a bit, but I still working it out, because the resistors only seem to help it when wired in series not parallel, which is kinda bad.
 
Connect a voltmeter directly across the battery and tell us what the voltage is when it is not working and what the voltage is when it is working.
 
Njguy said:
Alright I will in a bit, but I still working it out, because the resistors only seem to help it when wired in series not parallel, which is kinda bad.
Click to expand...

If the resistor is helping when wired in series, you are definitely overloading the power supply without the resistor. The resistor is reducing the current flow down within supply specifications.

I don't think it could be more obvious.

And your tests with other loads, in those cases you may have been "underloading" the circuit, I can't be sure without knowing the values of the components. Just realize, those are 40 amp SSRs, they are designed to switch fairly heavy loads, not 1 megOhm resistors. It really sounds like your having trouble targeting your overall load current to withing both SSR and power supply specifications.
 
I also am not sure about your PWM method. I'm not an expert with those kind of motor control circuits but I do know a little. Wouldn't it be better to PWM the input to the SSR rather than have the SSR switch PWM power at the load terminals? Usually you modulate a switch at the signal side. This relay may not be recovering properly between pulses on the output. Just my take on the design concept here.
 
I found out what the problem was. I am man enough to admit that the wires were not tightened to the relays enough. They apparently gotta be pretty tight. Problem solved. Now I must hang my head in shame.

Before when it wasn't tight enough, the led flickered with a regular interval.

Ke5frf thank you for your help. It was your suggestions that indirectly led me to the discovery. Thanks a lot!
 
Last edited:
Status
Not open for further replies.

Similar threads

L
  • Question
12vDC sled deck wiring
Replies
3
Views
1K
Tony Stewart
S
  • Question
Help wiring a single phase motor
Replies
7
Views
2K
MaxHeadRoom78
J
  • Question
Help Wiring a Leeson Motor
Replies
10
Views
2K
J Brenyo
J
T
  • Question
Timer wiring
Replies
3
Views
2K
For The Popcorn
F
P
  • Question
Modified wiring, your thoughts?
2
Replies
20
Views
3K
Nigel Goodwin
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…