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domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 08:26pm 01 Jul 2015

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Hi,

My favourite salvage yard has an American X-ray machine with lots of 100V/60Hz relays and lots of resistors. Pulled out one big one and several small ones, some of the smaller ones had steel rings around the coils to pick up different resistances.

The one whose photo I am enclosing measures 70 Ohms and Dr Google cannot tell me the wattage of it. Here are the details:

H100 68-S
Kanto (manufacturer?) 56-10

Seems to be a wire-would type wound around a ceramic cylinder and with two ceramic end pieces.

Once I know the wattage I might be able to build a dump load for approximately 300 Watt.

Any idea of the wattage of this thing?

Cheers
dom

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5078

Posted: 08:48pm 01 Jul 2015

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I would guess 100w. How much it can handle depends on how its mounted and/or if it can be cooled.

Whats your system voltage. Even at 50v, this thing will only draw .7amps, or 35 watts. So it should be fine at that watt loading, but it will get very hot to touch.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 09:25pm 01 Jul 2015

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Thanks Glenn for that. A friendly army person has given me a 36VDC UPS, so at the moment I am sticking to this weird voltage and the friendly contributor Commanda (amanda whynn) told me how to wire the F&P for that voltage.

If I cool it with a 12VDC fan from a PC power supply (similar to your setup), how many of those 100W resistors do you think I have to rip out of that X-ray machine?

Another possibility is a 48VDC heating element to the H/W system as a dump load, but I do not know how many Watts those elements consume, they seem to be sold in the US only.

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

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