[GreenKeys] Solid State Motor Control Relay

Sun Dec 27 21:13:54 EST 2020

Hi guys,

LMU12 (1/12 th HP), 12.25 starting, 2.8 running.
Page 7 of 
http://navy-radio.com/manuals/tty/jh/bsps/bsp/570series/570-220-100TC-Iss4.pdf

Covers all the other motors as well in several tables.

My quick survey of eBay looked like the higher rated SSRs weren't that much more expensive than the lower rated ones.

John, W9DDD

> On Dec 27, 2020, at 3:43 PM, Ralph Irish <w8roi at wowway.com> wrote:
> 
> G/K ang
> 
> One comparison I meant to make in the post below is this:
> 
> Many older TU designs, W2PAT, W2JAV, various versions of the TT/L all used vacuum tubes to
> do a lot of 'switching'.  Tubes could stand a lot of brief, excess voltage spikes and survive.
> Solid State devices like SSRs, SCRs, and the like, are often 'one zap' devices then they die.
> They cannot repair themselves, and some spikes can put them out of service.  Once a junction
> is breached, the device is dead or nearly so
> 
> If the 28KSR motor is a 1/20 hp device, the ASR motor is a 1/12 hp device, and its inrush
> will be even higher than the 9A mentioned in several earlier e-mails.  If you have a reasonable
> choice between a 15A and a 25A relay, take the 25A device.  Call it overkill or being 'super-
> conservative' or whatever, but for a small cost difference, 'go big'.  I will also guess that
> the physical size difference is not a lot.  Unless there is a real big cost difference, or the
> physical size prohibits the use of the larger device, again, 'go big'.  
> 
> If you run a 28ASR and buy a TU that you are told has the SSR, do check the current rating of
> the device.  Somewhere out there there are published figures for the 'inrush' of the 1/12 HP
> motor and I won't be surprised if it is close to 16 amps or so.  And the 'peak value' will be
> even higher.  Solid State Devices see and respond badly to excess 'peak values',  while tubes
> might laugh at them.  
> 
> For now,  73,
> 
> Ralph - W8ROI
> 
> -   -   -   -   -   -   -   -
> 
> 
> Begin forwarded message:
> 
>> From: w8roi <w8roi at wowway.com>
>> Date: December 27, 2020 3:18:50 PM EST
>> To: ad7i <ad7i at ad7i.net>
>> Subject: Re: [GreenKeys] Solid State Motor Control Relay
>> 
>> If I had a choice between 10 amp and 25 amp for a 28 motor I would not rely on the published ‘inrush current’ figure. 
>> 
>> The SSR will see and maybe react to the ‘absolute peak’ value, not the published value. 
>> 
>> The published ‘peak current’ value was determined before any solid state devices were in common use in Teletypes.  Other than the ‘Top-hat diodes’ in loop supplies. 
>> 
>> If that ‘Inrush current’ was measured with a ‘Peak-reading’ instrument it would be higher. 
>> 
>> AND  don’t forget that the ASR motors have an even larger HP motor and it’s inrush will be even more!
>> 
>> Hate to be a ‘bit-picker’ here but a higher value SSR might not be “overkill” here. 
>> 
>> Ralph- W8ROI 
>> 
>> -   -   -   -   -   -   -   -
>> 
>> 
>> 
>> 
>>> On Dec 27, 2020, at 2:32 PM, ad7i <ad7i at ad7i.net> wrote:
>>> 
>>> 
>>> Most of those physically larger SSRs on ebay don't seem to have much price variability with respect to rated current, so I usually buy whatever is cheapest that still meets the need.
>>> 
>>> Paul
>>> 
>>> 
>>> 
>>>> On Sun, Dec 27, 2020 at 2:22 PM w9ddd at tapr.org <w9ddd at tapr.org> wrote:
>>>> Don't know about 14/15 motors, but the 28 KSR motor draws  less than 2 amps.  Inrush during starting is about 9. Now my question is, is this installed and driving the machine, or on the test bench?
>>>> 
>>>> I suspect the 10 amp SSR would be fine.  Detailed specs would probably give you a surge current rating as well as the continuous duty rating.
>>>> 
>>>> 
>>>> John, W9DDD
>>>> 
>>>> 
>>>>> On Dec 27, 2020, at 7:53 AM, "til128 at juno.com" <til128 at juno.com> wrote:
>>>>> 
>>>>> I am wondering also if the 25 and 40 amp is overkill - would a Solid State Relay SSR-10DA be sufficient?
>>>>> 
>>>>> TT
>>>>> 
>>>>> Please note: message attached
>>>>> 
>>>>> From: ad7i <ad7i at ad7i.net>
>>>>> To: Jeffrey Angus <jdangus at att.net>
>>>>> Cc: greenkeys <greenkeys at mailman.qth.net>
>>>>> Subject: Re: [GreenKeys] Solid State Motor Control Relay
>>>>> Date: Sun, 27 Dec 2020 12:11:59 -0500
>>>>> 
>>>>> 
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>>>>> Thank you Jeff.
>>>>> 
>>>>> Paul
>>>>> 
>>>>> 
>>>>>> On Sun, Dec 27, 2020 at 11:46 AM Jeffrey Angus <jdangus at att.net> wrote:
>>>>>> On 12/27/20 8:39 AM, ad7i wrote:
>>>>>> > But I'm wondering if SSRs, in general, would be suitable for a TTY motor.
>>>>>> I use them for both controlling series governed motors and auto start.
>>>>>> 
>>>>>> -- 
>>>>>> "I am a river to my people."
>>>>>> Jeff-1.0
>>>>>> WA6FWI
>>>>>> www.foxsmercantile.com
>>>>>> 
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