Gas shut off systems

[sellers]

Does anyone have any good experience with these.

Customer has a gas cut of system that shuts off in the event of power failure, fire alarm, poor venting etc, Its a noodle bar with serveral hobs. An extract takes the fumes outside.

Last time I got called there the system was in fault and not resetting, I found it to be an air sensors pipe dislodged.

This time there has been some form of surge in the shopping centre and the system is not resetting. I pressume these systems have mcb's on all their control wiring etc, can anyon give me any pointers.

 

[Lurch]

It would depend on the system, pretty vague TBH. Maybe you could bypass all the control fuses?

 

[Sidewinder]

Sellers,

Let me know where & when & I'll come & FF & rectify for you my rates are resonable IMHO.

However, I guarantee a fix no matter what.

The cost however is NOT fixed!

ATB

 

[kme]

I`ll come & do it, too. Not a problem.

(snakehips - 2 heads and all that......)

Seriously; gas interlocks are such a diverse catchall description that they cover everything from simple air movement sensors in an extractor system, to microprocessor controlled logic systems with myriads of sensors.

To give "pointers" on such a vague description isn`t possible in the real world.

KME

 

[Bacon]

You could run a temp supply to control circuit with the need to energising the complete system and faut find from what should or shouldn't come in when system is started.

Used to allways do this on big control gear so as not to have 400v in panel when trying to find a B*****d of a fault.

 

[Sidewinder]

Bacon,

How are you going to get control systems that require 400V to work functional without this?

Otherwise you may as well test dead.

IMHO the 2 choices are dead tests or live tests, end of.

I've been at this a while & worked on some obscure & very complex kit over the years, but I have never managed to get a piece of equipment powered up correctly to fault find on it without its required supply voltage being present unless I modified the circuit first, thus you are then not fault finding the original system?...

 

[Bacon]

Well i would have thought it would be prob 400v into trany then prob 110v to control circuits.High unlikely the control circuit will be 400v

So hook up 110v from say your 110v transformer they yellow one then take it from there any contactors coils likely to be 110v.

 

[Sidewinder]

Really?

I have worked on over 2 dozen machines in the last week all with direct 400v a.c. control.

 

[Bacon]

Really?I have worked on over 2 dozen machines in the last week all with direct 400v a.c. control.

I was making a generalization that it may be 110v control as it may well be any type of control as you say you've done some 400v control circuits this week.

 

[Andy™]

Does anyone have any good experience with these.

nope. and i would suggest you leave it alone.

does your PLI cover you for messing around with gas control systems?

 

[Bacon]

Do you know any good gas men they may be a bit more clued up on this type of stuff or even get in touch with the manufacture who built it.

 

[sellers]

Jobs done now, thanks for all the good advice.

Turns out to be someone had accidentally switched off the extractors supply. Therefore activating the gas solenoid. Simple job and another happy customer.

 

[Bacon]

Good remember for next time it happens.