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I am trying to connect together

  1. PID Controller (ALTEC PC410, Output Relay (NO, max. 250VAC, 3A))
  2. K-type thermocouple
  3. SSR (uxcell SSR-25 DA 25A 3-32V DC / 24-380V AC Solid State Relay + Heat Sink)

Question Do I connect

  1. SSR Input Pins 3 and 4 to the PC410 OUT1 pins 4 and 5?
  2. 110VAC L to PC410 pin 1 and SSR Output pin 1
  3. 110VAC 'N' to PC410 pin 2 and one end of Load
  4. SSR Output pin 2 to the other end of Load

Proposed Wiring Diagram

On the SSR, top 2 pins are labelled LOAD, bottom 2 pins INPUT

enter image description here

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1 Answer 1

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Yes, you have it right. Observe polarity on the DC input to the SSR. Add appropriate fuses and an overtemperature cutout for safety.

Edit: Re your proposed wiring diagram edit, it's better to switch the hot rather than the neutral, as in your verbal description. You have the wrong pins on the controller as well (should be 4&5 like your verbal description).

Always fuse the HOT line, not the neutral.

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  • \$\begingroup\$ Thanks I made the changes to my wiring diagram in the OP. Does it look better now? Where on the Hot line should I place the fuse? \$\endgroup\$
    – Nyxynyx
    Commented Nov 4, 2016 at 19:22
  • \$\begingroup\$ Looks good. Fuse goes in series with the hot from the line cord (so both the SSR and the controller are fused). \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Nov 4, 2016 at 19:41
  • \$\begingroup\$ The PID output is speced Output: relay, normally open contact (max.250VAC, 3A). Is this suitable to trigger the SSR whose input accepts 25A 3-32V DC? \$\endgroup\$
    – Nyxynyx
    Commented Nov 7, 2016 at 3:51
  • \$\begingroup\$ I believe it brings the relay drive voltage out on pins 4 and 5 "Logic level , 20V/20mA, can trigger high- SSR". Of course the relay is a dry contact and cannot trigger an SSR without an external power supply. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Nov 7, 2016 at 3:53
  • \$\begingroup\$ There are 3 output options Relay, Analog and Logic. china-altec.com/english/products/temperature/pc900/PC900.htm \$\endgroup\$
    – Nyxynyx
    Commented Nov 7, 2016 at 3:53

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