Help required to select correct replacement Relay

[Anonymous]

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[Anonymous]

[Grizzly bearParticipant @grizzlybear]

CT,

Can you remove the suspect relay without too much bother.( Easier to test).

The relay may be driven with a transistor.

It's also likely to have a diode across the relay coil.

These items are usually less reliable than the relays.

Good luck, keep us posted.

.Bear…

[Former MemberParticipant @formermember19781]

[This posting has been removed]

[John BaronParticipant @johnbaron31275]

Hi CT,

These people stock the automotive relays

https://www.beal.org.uk/index.php

look under automotive.

[Anonymous]

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[Andy CarruthersParticipant @andycarruthers33275]

Have you considered a replacement unit from a car breaker? Most likely the units are generic off the shelf so may be found in various makes and models

[V8EngParticipant @v8eng]

I think SPAL Have a U.K. base in Worcester. Might be worth contacting them and asking for advice.

link to them here.

SPAL

Edited By V8Eng on 17/04/2020 13:14:28

[Grizzly bearParticipant @grizzlybear]

Hi CT,

The resistors are easy to check, the colours will indicate the correct values.

Diodes, if you have a multimeter, one way high resistance, the other way low resistance, plenty of info on the 'net.

Capacitors not so easy, best to change them, the values are written on them.

What are the numbers/letters on the transistors? You could swap them over to prove good or bad.

Where are you situated, I have a stock of components, cost of postage only.

Bear..

[Anonymous]

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[Anonymous]

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[Andy CarruthersParticipant @andycarruthers33275]

To test the resistors desolder one leg from the board and measure across component otherwise a false reading may occur

More likely to be diode, transistor or capacitor than resistor

If the transistors are NPN or PNP these can be tested in same way as diodes from base to emitter then base to collector, one way will conduct, reverse the leads and recheck which should not conduct

However, there are various other types of transistor ie FET, UJT etc which may not give the results you expect

If replacing polarity conscious capacitors make sure they are replaced in the correct orientation

[Anonymous]

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[Grizzly bearParticipant @grizzlybear]

Hi CT,

Thanks for the update.

Your duff relay probably has pitted contacts, causing it to malfunction.

Good thinking on the standard auto relay.

You will need to check if the relay coils are similar in value, do this with your ohmmeter.

Can you tell us what the numbers/letters are on the transistors, this will give us an idea of how much current they can switch.

Good luck,

Bear..

[SamsarandaParticipant @samsaranda]

I keep Koi and on my big pond I have an automatic filtration system, you can set the time period between filter purges, which then dumps accumulated crud to waste. I currently have a problem where the cleaning cycle initiates and functions but the final operation, the opening and closing of the waste valve, will not operate. By logically analysing the components and the electronics box I have worked out that it is a relay that isn’t functioning, inside the electronics box there are 5 relays of three different types, 2 types have built in adjustable timers just to complicate the issue; unfortunately I am unable to pin down which relay is the culprit, the electronics are really tightly packed in. I am now in the same situation as you CT, I need a replacement relay but didn’t know where to get it from. I found a makers name and reference number on each type of relay so I resorted to the good old internet and managed to track down the manufacturer, who is in China, what a surprise, I decided that as the relays only cost 10 US dollars each I decided to buy one of each of the 3 types fitted in my equipment so that I could substitute until I found the one that wasn’t working. The 2 spare relays will be kept for spares, you never know when you will need replacements. CT have you tried inputting the relay make and part number into the internet to see what comes up, that way you can bypass the manufacturer of your unit and get replacement from the original manufacturer. One thing to note my relays come as either 230volt or 12/24 volt, after ordering I received an email from the supplier to check which voltage I required, at least I know they are probably on their way, although who knows how long they will take to get here from China with the current pandemic situation.
Dave W

[Andy CarruthersParticipant @andycarruthers33275]

Grizzly bear offers good advice

Having looked at the pdf, yours is 1 Form C (Z) on the last page which looks to be compatible with a standard 12v relay, just be aware there are various standard 12v automotive relays!

If considering a replacement, from the pdf, the coil resistance is 130 ohms +/- 10% with current requirement of at least 12 A – that is, when the contacts are closed (NC) the replacement relay contacts must handle a minimum of 12A

I presume you have swapped the relays over (after checking they are identical) to see whether the fault moves? I expect this will be the case given your comment on intermittent operation but will confirm all other components are working ok

I did find this relay on eBay: https://www.ebay.fr/itm/163857213519 Please check the pinouts and unfortunately I don't speak French but it *might* be the right part

[Anonymous]

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[Andy CarruthersParticipant @andycarruthers33275]

IN4001 is a power device used in bridge rectifiers and the like (as opposed to a signal diode) and can be replaced with 1N4002-4 etc, these are pennies to buy

MPS A14 031 appears to be a Darlington NPN Transistor, high gain low power so not used to drive the relay, most likely to provide signal back to a control circuit – I am guessing behaviour based upon transistor characteristics

I think you have found the problem though – the relay itself

[Anonymous]

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[Andy CarruthersParticipant @andycarruthers33275]

Occams Razor – the simplest solution is always the best

I would go with direct replacement otherwise I have to ensure the replacement meets or exceeds the original item specification and modify wiring which from experience is time consuming and makes the fix non-standard, in years to come I don't have to remember what I did!

[Anonymous]

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[Dave HalfordParticipant @davehalford22513]

If RS fails you try Farnell

[Anonymous]

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[SillyOldDufferModerator @sillyoldduffer]

Posted by Andy Carruthers on 20/04/2020 09:04:39:

…

I did find this relay on eBay: https://www.ebay.fr/itm/163857213519 Please check the pinouts and unfortunately I don't speak French but it *might* be the right part

I think this is certainly the right part. It has a matching part number. HR-AMR-Y/012 Z1

HR-AMR-Y means it's an Automotive Relay. Although 'Fitre' made the faulty one there's no reason to replace it with another 'Fitre', any part matching the specification should do.

012 means it has a 12V coil

Z defines the pins, internal switch arrangement, current capacity and the 'must operate' and 'must release' voltages.

1 means the relay is fully sealed rather than being open or having a removable dust-cover.

The codes that matter when ordering an equivalent automotive relay are 012 and Z, and the French site ticks all the boxes.

Decoding part numbers is hit and miss. Many manufacturers use private codes making it difficult to identify entirely bog-standard components. Published identifiers can be hard to track down and it doesn't help the generic identities come in national flavours, usually for historic reasons. But in this case I think it's clear – the French relay is compatible, fingers crossed!

Dave

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