Mep-002a gets 240 at the lugs, but control box gauge says 120.

[cutters8]

it gets 240 at the lugs, but control box gauge says 120. I have put a Fluke on the back of the voltage gauge in the control box, and it show 120 as well, so the gauge is good, he current percentage gauge bounces, -hertz gauge has never worked- . The convenience outlet has 120 on both plugs. And can adjust voltage output via the knob on control box.
So I’m getting the corr power to the lugs etc…. What causes the power gauge to have only 120?
thanks!

 

[rickf]

What range do you have the meter set for? You may only be reading between one pole and neutral.

 

[rickf]

I found a very informative video that may help both you and another poster with his issues.

 

[cutters8]

What range do you have the meter set for? You may only be reading between one pole and neutral.

I read the L1 and L3 and get 240, I read l1 and L0 get 120, and L3 and L0 and get 120, that is all working correctly, there is only 2 terminals on the back of the voltage meter in the control cabinet, and when measured on them, it only gets 120, which is what the gauge reads. What makes the lugs and outlet give correct voltages, but the control cabinet voltage meter only get up to 120? Thanks

 

[Light in the Dark]

Is this machine new to you, or have you seen it register correctly before... and now it isn't?

 

[cutters8]

Is this machine new to you, or have you seen it register correctly before... and now it isn't?

I Have had it for about 12 years, it was working fine, then about 4 years ago it started overvolting, 300-316 at the lugs 160-170 at the outlet, I bought a new voltage regulator off of here (Mr Jim I think? it has been a few years) and that did not fix it, I replaced the T1 and T2 transformers, no joy. I finally found the TM and checked the CVT1 at C1-C2 and it was wide open. So... finally found a replacement CVT1 and installed it, bingo, now i have 240 volts like it is supposed to. Everything works fine on the output, but the monitoring portion, in the main control box, I only get 120 on the voltage gage, on the front and when I put a meter on the back of it. I used an external monitor and I have correct voltage and hertz. Thanks (edit to say correct voltage at the lugs)

 

[kloppk]

What do you have the AM-VM switch set to?

 

[Ray70]

Make sure the switch Kloppk indicates is in the 2:00 position on 1 L3-L1 L3
If this is correct, I would clean and exercise both that AM/VM switch as well as the main AC selector switch in the AC reconnect box.

 

[rickf]

Post #2

 

[cutters8]

Make sure the switch Kloppk indicates is in the 2:00 position on 1 L3-L1 L3
If this is correct, I would clean and exercise both that AM/VM switch as well as the main AC selector switch in the AC reconnect box.

Well, If I was to just say, hmm.... I sure thought I had that switch set to 1 L3-L1 L3. But no, I had it set to 5:00 position, 1 L3-L0 L3. Could have sworn I had that put right. Well, it all works now, thanks to yall. Bone head move on my part, thanks again guys.

 

[Guyfang]

If I had a dollar for every time...........................................................................

And yes, its happened to me also.

 

[Ray70]

Precisely why you should always start by checking the SIMPLE, FREE stuff first, if all that fails, then dig deeper.... inspect, test and lastly replace!

 

[Scoobyshep]

Dont feel bad, I recently did a service call on an inoperable machine, Short version is they tend to work better with the Emergency stop Not pressed.

 

[FarmingSmallKubota]

Dont feel bad, I recently did a service call on an inoperable machine, Short version is they tend to work better with the Emergency stop Not pressed.

I got an 802a bought as inoperable recently and pulled the E-Stop out then pushed it back in and it took me a day after voltage testing many things to realize the error of my ways. Amazing how after working on so many units something simple can catch you off guard or just over look one thing.

 

[rickf]

That is because the military likes, insists, that their equipment be overly complicated. Most people go out and hit the key or pull the rope on their civvie gensets and they start and are ready for use with no other processes to check.

 

[Guyfang]

Happens to everyone.

When I was a contractor, I got a call about a gen set. Wont start. So the next morning I got in the car at 05:00 and drove about 415 klicks to a unit up North. A whole crew of people met me at the gate. Mechanics, Motor Sgt. CWO. and a Plt. Leader. And they all explained how and why they had done this and that, and "No Workie" So we troop in. Everyone is still telling me "their" story. So we get up to the set, and I said "Show me". And they did. No workie.

So I reached up, and pushed the Single Unit/Parallel Switch to single unit, and told them to start it. It started and ran. Well, it was sad face all around. Everyone was looking at their boots and mumbling stuff. I smiled, and said, "What the **** is wrong with you People? The same thing has happened to me several times, 25-30 years ago. And I have seen it countless times over the years. I am not mad and you all learned something." Then all the sudden everyone perked up and started to laugh and be normal. Thats when I said, "Who is buying lunch?"And we darn sure did not go to Micky D's.

 

[Light in the Dark]

Yeah even today I occasionally stupify myself either with the E Stop or Battle Short. Oh well!

 

[kloppk]

Yeah even today I occasionally stupify myself either with the E Stop or Battle Short. Oh well!

Same here