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Have a Mep 802A that has power to receptacles. Only power to lugs when I hold up the contact switch. As soon as I let go the light goes off and no more power to lugs. K1 was replaced. Any suggestions?
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Mep 802A no power to lugs. Power to receptacle.
- Thread starter Mattguy
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- Pepperell, Massachusetts
Check to see if there is a diode across S5 terminals 2 & 5. Verify end of diode with the stripe on it is connected to terminal 2.
After starting it are there any fault lights illuminated?
Test the fault lights with the test button to verify they all work.
After starting it are there any fault lights illuminated?
Test the fault lights with the test button to verify they all work.
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- Highland, Indiana
No fault lights. It's weird that I can get it to trip the contact with the switch. But it will not hold.
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- Burgkunstadt, Germany
It's weird that I can get it to trip the contact with the switch. But it will not hold.
What do you mean here? What contact? What switch?
What do you mean here? What contact? What switch?
Ray70
Well-known member
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So I believe he means he is able to "close" the contactor by holding the switch, but it doesn't stay closed.
"Trip" was probably not the best term to use...
Did you check the switch to ensure the diode is installed ( correctly ) and you should also verify the diode is good.
If that all checks out, you may have a bad overload relay, the black box all the way to the left inside the control panel, behind the outlet.
The signal to close K1 runs through the overload. I once had a unit doing the exact same thing and the overload was faulty.
However, you have to verify the switch and diode are good per Kurt's reply #2 , before moving on.
Start with the easy things first, then move forward...
"Trip" was probably not the best term to use...
Did you check the switch to ensure the diode is installed ( correctly ) and you should also verify the diode is good.
If that all checks out, you may have a bad overload relay, the black box all the way to the left inside the control panel, behind the outlet.
The signal to close K1 runs through the overload. I once had a unit doing the exact same thing and the overload was faulty.
However, you have to verify the switch and diode are good per Kurt's reply #2 , before moving on.
Start with the easy things first, then move forward...
- 753
- 1,332
- 93
- Location
- Highland, Indiana
Thank you!So I believe he means he is able to "close" the contactor by holding the switch, but it doesn't stay closed.
"Trip" was probably not the best term to use...
Did you check the switch to ensure the diode is installed ( correctly ) and you should also verify the diode is good.
If that all checks out, you may have a bad overload relay, the black box all the way to the left inside the control panel, behind the outlet.
The signal to close K1 runs through the overload. I once had a unit doing the exact same thing and the overload was faulty.
However, you have to verify the switch and diode are good per Kurt's reply #2 , before moving on.
Start with the easy things first, then move forward...
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- Highland, Indiana
Diode tested good. Power only one way.
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So this may be the culprit?
- 16,716
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- Burgkunstadt, Germany
I would say that the K20 is not staying closed?
Can you start the set, turn on the S7, and then close the K1?
Can you start the set, turn on the S7, and then close the K1?
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Yes if I hold s7 it will keep contact closed on k1 while running. If I release, it will release contact on k1.
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- 16,716
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And no idiot light comes on?
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The light comes on if I hold s7 up. And there is power to lugs.
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- Pepperell, Massachusetts
The diode is installed backwards!
The stripe should be on the RIGHT. Like this...
The stripe should be on the RIGHT. Like this...
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- Highland, Indiana
Oh boy. Let me flip this around.
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Ray70
Well-known member
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Check to see if there is a diode across S5 terminals 2 & 5. Verify end of diode with the stripe on it is connected to terminal 2.
That's why it's very important to read everything and check everything carefully.
If you hadn't posted that picture we would all have assumed you verified both the diode's correct orientation and functionality and moved on to the next idea!
Luckily Kurt has a keen eye!
Glad you got it fixed for Zero$
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Steelsoldiers has got to be the best place for info! I'm learning generators and now have 5 Mep802s in my shop. I can only help with Humvee questions as that is my speciality, but Iove to learn.
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And that little change could have been the reason why this machine left the pool.... funny, right?
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Funny (strange) that it happened - but nobody laughed for sure.
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Who knows when and where it happened?