SSD voltage and limit switch

Posts: 1
Joined: Thu Sep 04, 2014 11:30 am

SSD voltage and limit switch

Postby neo » Thu Sep 04, 2014 11:43 am

First, there are two voltages in the documentation:

Page 1
SSR activated voltage: open circuit: 6V; short circuit: 40mA.

Page 3
2: Relay J1 and J2 as alarm outputs; SSR PID output 8V SSR signal. Target: SV

Is this a type-o or am I missing something.

Second, if I need to use a reed/limit switch, I do not see a feedback circuit. I suppose I should wire it in parallel with the SSR or relay?

Posts: 4401
Joined: Mon Jun 15, 2009 3:00 pm

Re: SSD voltage and limit switch

Postby Tech_Marco » Thu Sep 04, 2014 11:52 am

It really doesn't matter, 6V or 8V. Open circuit could be 8V but in closed circuit, it may dropped to 5~6V
SSR take 3V~36V so it is not really a concern in this scenario

Sorry, I have no experience to the application you're asking. I'm not an expert in this case


Posts: 270
Joined: Mon Jan 03, 2011 3:47 pm

Re: SSD voltage and limit switch

Postby richiem » Fri Sep 05, 2014 3:21 pm

@neo -- RE question 2:
The mechanical relays J1 and J2 are regular electro-mechanical relays actuated by various programmed functions in the controller -- there is no built-in power source connected to them, so any thing controlled by closing or opening one of the relays needs an appropriate power source as well.

Please do not connect anything in parallel with the SSD control output unless it is a relatively high impedance load so as not to add an extra current load to the output to the SSD.

If you would like additional comments or help about your particular application, explain what you need to accomplish, and someone here will aid you.

Best regards

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