FS 0 to 280 VAC, 7.2 KVA Isolated Variable AC Power Source $1,200 OBO - diyAudio
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Old 13th October 2013, 05:27 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Location: Minneapolis, MN 55404
Default Withdrawn from Sale - 0 to 280 VAC, 7.2 KVA Isolated Variable AC Power Source

Withdrawn from Sale

================

0-280 VAC, 7.2 KVA Isolated Variable AC Power Source,

I have a 8.4 KVA VARIAC, a 7.5 KVA Isolation transformer, circuit breaker, and associated switches, that can be wired as an Isolated Variable AC Power Source with a Fully Floating 0-280 VAC, 7.2 KVA Output. It is much safer to work on electronics with a floating output without a ground reference. The isolation transformer has an extremely low leakage current rating. This can be operated from 240 VAC, 208 VAC, or even from 120 VAC with the optional paralleling choke for the VARIAC.

0-140 VAC Range: 60 Amps output up to 120 VAC and 52 Amps output at 140 VAC.

0-280 VAC Range: 30 Amps output up to 240 VAC and 26 Amps output at 280 VAC.

It would probably cost you at least $1,750 to put this package of parts together.

I'm asking $1,200 or best offer.

Component information:

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Technipower Type W30G2 Dual Gang VARIAC. This is the ORIGINAL VARIAC brand once owned by General Radio. Each gang is rated for 0-140 VAC, 50/60 HZ, 30A Output, 4.2 KVA, with a combined output of 8.4 KVA.

These gangs may be connected in series and operated from 240 VAC and output up to 30 Amps at 280 VAC, with a total output of 8.4 KVA

These gangs may be connected in series and operated from 208 VAC and output up to 30 Amps at 243 VAC, with a total output of 7.2 KVA.

With an optional paralleling choke, these gangs may be connected in parallel and operated from 120 VAC and output up to 60 Amps at 140 VAC, with a total output of 8.4 KVA.

This VARIAC is in barely used condition. Check the photo of the VARIAC brushes and note there is no noticeable wear. Doubtful that you could find a used one in this condition for less than $500. I've been looking online and I haven't even been able to find a used one for sale at any price. This VARIAC would cost over $2,000 new.

VARIAC Catalog with Ratings:
http://www.jamminpower.com/PDF/GR%20...log%201961.pdf

http://www.unipowercorp.com/pdf/Variac_Single_Phase.pdf

Technipower Variac Autotransformers
3120-5120 W30G2 0-140VAC 2-Gang $ 2,028

**************************************

Signal Transformer Model # DU-7.5 - 7.5 KVA Isolation Transformer, Industrial grade.. This Transformer is New. It's just been sitting around my shop for over 10 years. It sells new from the manufacturer for $905.54 plus some very hefty shipping charges.

Manufacturer's Specifications: http://www.signaltransformer.com/sit.../pdf/DU-SU.pdf

**************************************

Ohmite Model # 412-2-T2 2-position, 2 gang, rotary switch used to connect the isolation transformer output in either series or parallel for range switching. It is rated for 50 amps at 300 VAC. Each gang of the switch would only need to handle 30 Amps maximum, so this switch is used very conservatively. This switch is New. It sells new for over $190 in small quantities, and Over $130 in quantities of 100.

http://www.ohmite.com/cat/controls_switches.pdf

Ohmite - 412-8E - Sensors, Switches & Relays - Switches - Allied Electronics

**************************************

Eaton Model# 7818K1 DPST 40 Amp 600 VAC rated switch for the AC input. This switch is New. It sells new for about $21 each.

Data Sheet:
http://www.klocknermoeller.com/eaton.../11/11-6-8.pdf

Eaton / Switches - 7818K1 - Uncategorized - Allied Electronics
7818K1 - EATON - Toggle | Newark
7818K1 Cutler Hammer/Eaton | Buy 7818K1 | Onlinecomponents.com

**************************************

Square D Type QOU230 2 Pole 30 A, 120/240 VAC Panel Mount Circuit Breaker used to protect the VARIAC from overload. This circuit breaker is New. It sells new for about $34 each.

Data Sheet:
QOU Unit Mount Circuit Breakers - For overcurrent protection and switching on both AC and DC systems - Products overview - Schneider Electric

QOU230 Circuit Breakers by Square D

**************************************

Optional: Ohmite Model # 412 7-position, 1 - gang, rotary switch. It can be used to connect a ground to the output of the isolation transformer. In some cases you may wish to have the safety ground connected to the isolation transformer output.

It is rated for 50 amps at 300 VAC. This switch is New. It sells surplus for over $100.

http://www.ohmite.com/cat/controls_switches.pdf

**************************************

(Please note that I will consider selling these components separately. I will have the isolation transformer and the VARIAC listed separately)
Attached Images
File Type: jpg VARIAC%20Front.jpg (140.8 KB, 33 views)
File Type: jpg VARIAC%20Connection%20Plate.jpg (110.6 KB, 32 views)
File Type: jpg VARIAC%20Brushes.jpg (373.1 KB, 31 views)
File Type: jpg Transformer%20Side.jpg (190.1 KB, 30 views)
File Type: jpg Switches.jpg (126.7 KB, 29 views)
File Type: jpg Switches%2050A%202Pole.jpg (244.7 KB, 4 views)
File Type: jpg Switches%2040A%20Side.jpg (160.3 KB, 4 views)

Last edited by Scott Novak; 10th November 2013 at 06:16 PM.
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