AM2 - D.O.L

[SteveSparks]

Hi all, about to put in for my 3rd AM2 attempt, can't work out what I'm getting wrong!

I passed everything 1st time except for DOL starter, feedback given was - "The installed circuit was not completed to a fully functioning standard".

... And exactly the same for my 2nd attempt!

I don't quite understand, everthing worked on the functional test, everything was good on the testing too. Both times I made sure I followed the diagram, and I read through it all twice. In my case the terminations on the motor were L3-L2-L1.

I'll be up again within the next the month, but I feel as though I will just do everything exactly as I did the first 2 times!

Clearly I'm missing something, does anyone have any ideas?

 

[James]

Is there a reason why you reversed the phase rotation?
123 would be normal for clockwise rotation.

 

[SteveSparks]

Is there a reason why you reversed the phase rotation?
123 would be normal for clockwise rotation.

Hi mate, yeah because it's what the spec stated. I looked around online after my first attemt to make sure I wasn't doing something stupid, and it seems to be a common one they slip in there to ensure we're reading the spec properly.

 

[westward10]

Did your sequence match the motor sequence, if so where did you change it from the norm?

 

[SteveSparks]

Hi mate, yeah because it's what the spec stated. I looked around online after my first attemt to make sure I wasn't doing something stupid, and it seems to be a common one they slip in there to ensure we're reading the spec proper

Did your sequence match the motor sequence, if so where did you change it from the norm?

Hi mate, I passed the inspection & testing section on the 1st attempt so I didn't get to test it 2nd time around.. If I remember correctly the phase sequene at the motor was correct - L1L2L3, what I took from that is that the terminations on the load side of the DOL were actually in sequence, but at the supply they went from right to left instead of left to right.. if that makes sense?

The spec specified something along the lines of L3 to T3, L2 to T5, L1 to T7, so the motor wasn't wired in reverse, although at first glance it appeared to be. I'll try to explain in more detail if that doesn't make sense

With that said, my analysis could be wrong, as I'm clearly getting something mixed up along the way.

 

[davesparks]

Did you have the overload fitted and set correctly?

As you say the motor actually functioned it makes me think it could be something as small as the overload setting being wrong.

Did the motor turn the correct way?

 

[SteveSparks]

Did you have the overload fitted and set correctly?

As you say the motor actually functioned it makes me think it could be something as small as the overload setting being wrong.

Did the motor turn the correct way?

Yeah, I set the overload.. 99% sure I had it correct, I also had to write the setting as well.

There wasn't an actual motor on the rig, just the terminations within an enclosure where the simulated motor would be.. The enclosure had test points for the probes when testing phase sequence/continuity etc.

 

[davesparks]

Yeah, I set the overload.. 99% sure I had it correct, I also had to write the setting as well.

How did you get the setting for it? There's a lot of myths around setting overloads for DOl starters that lead to people setting them wrong.
The overload on a DOL should be set to the FLC on the motor data plate unless manufacturers instructions say otherwise.

There wasn't an actual motor on the rig, just the terminations within an enclosure where the simulated motor would be.. The enclosure had test points for the probes when testing phase sequence/continuity etc.

Well that's just boring, we had a physical motor with a guard over the output shaft when I did it. But that was around 20 years ago.

 

[SteveSparks]

How did you get the setting for it? There's a lot of myths around setting overloads for DOl starters that lead to people setting them wrong.
The overload on a DOL should be set to the FLC on the motor data plate unless manufacturers instructions say otherwise.



Well that's just boring, we had a physical motor with a guard over the output shaft when I did it. But that was around 20 years ago.

wattage
400x1.73 x0.8

answer + 10%

but there was a data plate also, which I checked against the manual calculation above.

As for the motor.. That was probably before the days of private firms doing Am2's keeping an eye on their profits!

 

[davesparks]

wattage
400x1.73 x0.8

answer + 10%

You're missing the motor efficiency from the equation.
What is the 10% increase for?

but there was a data plate also, which I checked against the manual calculation above.

Did it agree with the FLC you calculated?


Your above post where you say you had to connect L3 to T3, L2 to T5 and L1 to T7 strikes me as a bit odd.
Typical terminal numbering on a DOL starter is inputs labelled as 1/L1 3/L2 5/L3 and outputs being 2/T1 4/T2 6/T3 with 13 and 14 being the hold-in contact, 95 and 96 being the N/C contact of the overload.

 

[SteveSparks]

I think I’ll just buy a DOL and play around with it. I don’t remember ever working with one in the real world, I must be missing something obvious or mis-interpreting the spec somehow.

Thanks for your input