[GreenKeys] Solid State Motor Control Relay

[Steve Garrison]

Those are the same type SSRs that I’ve been using in conjunction with Jack Hart’s (K2TTY) motor control board for some time.

 

I even have one mounted inside an LESU on a model 28KSR along with the motor control board on the underside (with LESU in normal working orientation) of a blank removable LESU plate.  No issues, never even noticed any heat from the relay.

 

Steve G./N4TTY

 

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of ad7i
Sent: Sunday, December 27, 2020 9:40 AM
To: greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Solid State Motor Control Relay

 

Greetings Greenkeyers --

 

Has anyone tried to use a Solid State Relay (SSR) such as that shown below to control a TTY motor?

 

https://www.ebay.com/itm/1Pcs-Solid-State-Relay-SSR-40DA-SSR-25DA-3-32VDC-TO-24-380VAC-New/312717019695

 

I'm using two of these solid state relays on dehumidifiers in my basement, so that the safety switch in the condensate pump can interrupt the AC power to the dehumidifier if the pump can't pump.  The SSR's electronic "contacts" have the equivalent of two diode drops in series with them, so that at 1 ampere of AC current passing through the relay contacts will dissipate about 1.5 watts.  I have my humidifier SSRs mounted on a small heatsink but I think it's overkill for that application.  

 

But I'm wondering if SSRs, in general, would be suitable for a TTY motor.

 

The alternative for me is an old school mechanical contact relay, in particular:

 

https://www.mouser.com/datasheet/2/418/5/NG_DS_T9G_1216_1117-1281449.pdf

 

Please let me know what you think about using an SSR for a TTY motor.

 

thanks,

 

Paul, ad7i

 

 

 

 

 

 

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