rly210 timer for softstart - diyAudio
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Old 14th November 2006, 01:31 PM   #1
traw is offline traw  United States
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Join Date: Sep 2005
Default rly210 timer for softstart

Someone had given me one of these - wish to use to as softstart.
http://www.hobbytron.com/NTE/relay/pdf/RLY210.pdf

Looks like delayed turn on in series with load using terminals 1 and 3, thus need resistor like 50 ohm in parallel with 1-3 to leak some juice through for cap charging prior to delayed turn on. However, bothered with the 1A load mentioned which would shoot this down. or am i completely misunderstading this datasheet and device? perhaps alternate way to apply

Have alternate softstart built, but since had this one on hand and could be very tidy curious if useable. Modules a little pricey and cheaper to build softstart with simple relay.
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Old 15th November 2006, 08:56 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
you read the 1Aac limit correctly.
For a medium to large toroid or large EI transformer soft start circuit you will need a lot more than this.

Note also, it is a solid state relay.
I don't think SS is suitable for supplying any decent transformer.
It may be OK with a PCB mounted transformer upto 36VA, but I would not trust it any higher.
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regards Andrew T.
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Old 18th November 2006, 10:18 AM   #3
frank1 is offline frank1  United Kingdom
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Join Date: Apr 2006
Location: Devon UK
Quote:
Originally posted by AndrewT
Hi,
you read the 1Aac limit correctly.
For a medium to large toroid or large EI transformer soft start circuit you will need a lot more than this.

Note also, it is a solid state relay.
I don't think SS is suitable for supplying any decent transformer.
It may be OK with a PCB mounted transformer upto 36VA, but I would not trust it any higher.
But it would be ideal when used to energise a large power relay (with AC coil) as a slave.

FDJ
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