[GreenKeys] Model 15/19 power supply 120VDC

[eric]

And when it's drawing current, the thyratrons in the REC-30 power supply 
glow brighter, so it's a really nice light show while you're typing -- 
https://www.youtube.com/watch?v=fxy2Ifo8Xx0

fwiw i measured mine at 600-700mA at 120vdc with the punch engaged so 
yeah I'd definitely count on it really needing 1A.

-eric

On 2026-03-03 17:58, E. wrote:
> Yeah, while the punch sits there, it draws nothing (so as long as the 
> 14TD isn’t powered on alongside it… usually the two are tied to the 
> same power source)… but when a punch occurs, the amperage very quickly 
> and briefly spikes up to around 1A.  Type as fast as ‘punchingly' 
> possible and you can imagine how many spikes can be had within a short 
> period of time.
> 
> 
>> On Mar 3, 2026, at 7:49 PM, Johannes Eggers 
>> <johannes.eggers at gmail.com> wrote:
>> 
>> So, with the punch running, does it actually draw 1 Amp ?  That'd be 
>> 120 Watts, which seems a lot.  If the printer solenoid takes 60mA at 
>> 120V, so 7 Watt, then the 5 punch solenoids would have to draw 3 times 
>> as much, each, to get to 100 Watts.
>> 
>> That PSU runs about $200 now, double-yikes !
>> 
>> Thanks for the info.  I'm a little bit wiser now, but I still don't 
>> understand what I hear about the 60mA loop current: If I put a 2k 
>> resistor in series with a 120VDC supply, then the current will be AT 
>> MOST 60mA (if the solenoid shorts out), but if the solenoid is OK, 
>> then I'll get LESS than 60mA.  I need to find my Model 15 and measure 
>> the coil resistance.
>> 
>> I assume when the punch isn't punching, it draws nothing?
>> 
>> Thanks,
>> 
>> Johannes
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