Megger 1730 non trip loop....

[rich.250]

Has anyone else had the problem of it tripping rcds on non trip loop?? seems only wylex in my case.
I have spoke to megger to be told i was performing the test wrong! Quite rude tbh.
I have since spent a lot of time thinking about it and the external earth fault path it takes...
so i have tried switching the two leads polarity, as it can only go the same way.
and it WORKS
have tried it at a few jobs and even tried results on other rcds in both configurations to prove its accurate
would appreciate your feed back.

 

[stevey1983]

Same thing happeneds to me, does it on Crabtree Rcbos and Eaton Rcbos too

 

[Specialist]

Seems to be a fairly common problem with Megger Non Trip loop tests, think if you look ther'es a thread about it somewhere

 

[MarkieSparkie]

There is a known issue no-trip testing on the Megger 17xx MFTs (no known issues with 15xx models) with certain RCDs and RCBOs, particularly Wylex NSB and NSBS for NH boards. About 4 months ago Megger said they are working on a firmware update to resolve this issue. Contact Megger Technical Department for further assistance.

 

[rich.250]

Thanks for your help guys

 

[trypod]

What firmware version is it?

 

[rich.250]

How would i find out the firmware version trypod??

 

[trypod]

turn primary function knob to V turn secondary function knob to spanner symbol then the display will show version number latest shipped is V1.09

 

[rich.250]

version 1.07
only got it last week though, aparently direct from megger......

 

[trypod]

V 1.07 is the latest for the 1720

 

[rich.250]

So they sold me out of date software....
thanks for the heads up, will look into it
cheers

 

[ample current]

I have a 1730 also and ist only 1 month old and says ver 1.07

 

[applemac]

any news on a new update for the 1730? im ver 1.06

 

[stevey1983]

Mine is only v1.05 :-(

 

[applemac]

any versions ok... if it works....

 

[SPARTYKUS]

Sell them all and buy a 1552 off tinterweb for 250. Use the spare 5-700 to buy alot of beer. Drink beer. Experience no testing problems.

 

[i=p/u]

i heard somehting about swapping polarity... seems stupid to me to swap the leads around.....

 

[Fusionsparks]

Any news on the new v1.09 firm ware fixing the RCD/RCBO problem. I sent mine back due to a constant large discrepancy between high and low current loop tests. Does anyone else suffer from this on the 1730?

Megger explain the fluctuating readings by saying the meter will only give accurate reading to 0.1ohms this seems poor as the Fluke equivalent offers 0.01ohms.

The reason I mention it is that I'm still interested in the meter as I find three lead loop testing a nuisance and having to press 'test' whilst fault finding unessarsary.

 

[Fusionsparks]

It would be interesting to know if the new V1.09 firmware upgrade has fixed the RCBO tripping issue?

I had two 1730 MFTs and they both went back due to the large discrepancy between the high and low current loop test results (high was always the greater value). Has any one else experienced this whilst using the meter?
Also a loop test could be performed at the same point several times with a different value every time, it would be great to know if this has been resolved too?


I would still like one of the units as the two loop is a great idea in theory and the auto test is also great but it's all useless if random values are given and the low current loop test trips RCBOs.

Also Megger please keep your site up to date so users can check their firmware and existing faults out....not too much to ask considering the cost I think.

 

[MarkieSparkie]

It would be interesting to know if the new V1.09 firmware upgrade has fixed the RCBO tripping issue?
Also Megger please keep your site up to date so users can check their firmware and existing faults out....not too much to ask considering the cost I think.

Well said mate, it's scandalous that this issue is still going on. If this was a car the VOSA would have issued a mandatory recall by now ... Megger appear to have adopted a mushroom consumer relations policy ... feed them enough manure and keep them in the dark.

 

[Midwest]

Well said mate, it's scandalous that this issue is still going on. If this was a car the VOSA would have issued a mandatory recall by now ... Megger appear to have adopted a mushroom consumer relations policy ... feed them enough manure and keep them in the dark.

I'm thinking of buying the 1730, has this issue been resolved yet?

 

[trypod]

latest firmware 1.10

I think most issues have been resolved

 

[MarkieSparkie]

I'm thinking of buying the 1730, has this issue been resolved yet?

Megger say that Firmware version 1.10 has fixed it (as 1.09 was claimed to and failed, again!), but I'm unable to verify this at present, my guinea pig (apprentice) will be carrying out a field trial next week. However, there is a temporary work around, i.e. reverse the polarity of the two wire test leads, which works for virtually all firmware versions in most cases.

 

[trypod]

latest firmware 1.13

 

[stevey1983]

how do you update the firmware?

 

[MarkieSparkie]

As Trypod has indicated there have been multiple updates in recent days (more empty promises!). As soon as there appears to be a stable firmware we will conduct another trial. This protracted situation is sure to be denting Megger's previous good reputation.

 

[trypod]

To be fair to Megger I have not had any issues will firmware V:1.09 or 1.10

 

[Vito04]

Just received a loan MFT1730 from megger whist mine as the latest no trip firmware upgrade. The loan tester's version is 1.13 so fingers crossed

 

[trypod]

latest firmware V2.01 on mft1720's & mft1730's

 

[Sparky Ninja]

Hi guys,

I am recycling this old thread as it seems to be on topic.

I am currently writing some reviews for the megger 1700 series, I have each of the three models at my disposal and what I would like to know is if any of you are still having trouble with them - and what version you are on.

The models I have are the 2.01 and all seems to work okay, whilst one of my students had the same model (the 1720 in this case) and his was 1.26 or something. His was tripping Wylex RCBO's and noticeably, a couple of the selectable options such as 2 lead no trip were absent on some of the selection possible.

So, is anyone having any trouble/complaints with these MFT's still?

Thanks

widdler

 

[applemac]

my 1730 is a year old and going back to dover for a software upgrade and calibration,

i hear its sorted most faults out, still like it to much to change it....

 

[MarkieSparkie]

Providing you ignore the dubious value of Zref, R1+R2 and two wire loop testing, the release of firmware version 2.01 appears to be stable and have the MFTs working the way they should have done at their release a year ago. Any further updates to the firmware should only be the occasional optimisation tweaks from now on (fingers crossed); time will tell.

​

 

[Vito04]

Just received a brand new 1730 replacement (2.01).

Since my original post they managed to lose mine but all seems to have been solved now.

 

[Sparky Ninja]

I've played with the 1720 this evening, and I noticed that the loop test when carried out at '2Lo' gave a much higher reading as the old fashioned no-trip '3Lo'.

0.39 ohms on 2Lo
0.18 ohms on 3Lo

A 10m or so cooker circuit with a Ze of 0.12 ohms when tested on 2Hi.

So the 3Lo seems within expectations, but the 2Lo just seems pointlessly inaccurate.

 

[SPARTYKUS]

As stated in another thread, it was released "tested enough" (as in not enough), and we (sparkys) have been completing their final testing phase (User testing) and paying them for the privilege.

 

[trypod]

latest firmware V2.05 on mft1720's & mft1730's

How many more updates?

 

[SPARTYKUS]

Until the mass populous of working electricians that bought an untested meter, have performed the necessary out in the field testing on behalf of the said meter manufacturer?

 

[MarkieSparkie]

latest firmware V2.05 on mft1720's & mft1730's

How many more updates?

My contacts at Megger's Technical Department tell me they are:- still working towards a solution for the variable and inaccurate two-wire loop measurement and to expect further firmware tweaks in the coming months as this is now an iterative process (to me the whole development process has been iterative).
Personally I'm just ignoring two-wire loop measurement completely. I'm happy using the MFT within the current limitation and will now wait until the annual calibration next year for a firmware update by which time, hopefully, the iterative process will have achieved its goal and accurate two-wire loop testing will be at last be possible.

 

[Vito04]

Here we go again,

I've been out to another job today with Wylex NHX RCBO's and have been unable to Zs test any circuit because they trips. I really wished i never upgraded from my 1553

 

[MarkieSparkie]

Here we go again,

I've been out to another job today with Wylex NHX RCBO's and have been unable to Zs test any circuit because they trips. I really wished i never upgraded from my 1553

We haven't had any problems testing with Wylex RCBOs since firmware update 2.01. You could reverse the connections of red and black probes at the test-points (black on L, red on N and green on CPC), as a work-around solution, like we use to do earlier in the MFTs evolution.

 

[Deleted member 38070]

I have mft1730, was getting wildly different readings on live zs non trip mode compared to an fluke 1653 i had, I sent it back to Megger and they updated the firmware version 2.05. On the l-pe setting you now have 3lo,2hi and 2lo options which you can flick through to suit, it seems ok now apart from 2lo and 3lo readings are totally different?, I've had nothing but trouble with the 1730.. :-( the fact is: I don't really trust the 1730's readings anymore, I've gotta say ALL the other functions are great... apart from the leads don't fit my r2 lead and socket and see, disappointed with it. i'm getting shot of it......

 

[SPARTYKUS]

One word, 4 numerics


"1552"