reboot
New member
- 11
- 0
- 1
- Location
- Grafton/IL
Any body got a idea why my generator gets 120volts to ground
on each leg but 0 volt between legs should be 240
on each leg but 0 volt between legs should be 240
-
Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
mep-802A gen set
- Thread starter reboot
- Start date
Poccur
Active member
- 201
- 134
- 43
- Location
- Roanoke, VA
I am no MEPs expert but if you have 120V phase to neutral but 0v phase to phase on a generator that could be because the 'phase to phase' is reading the same phase...there would be 0V of difference, so the meter reads 0v..there is 120V difference between phase and neutral so you get a reading but if both legs have the same phase on them..the meter reads 0V...as they are in phase...
reboot
New member
- 11
- 0
- 1
- Location
- Grafton/IL
120/240v 1ph runs good on stuff that is 120 volt just not getting 220volt between l1 and l3
- 2,530
- 2,055
- 113
- Location
- Efland, NC
Can you take a photo of the phase switch behind the instrument panel?
- 400
- 23
- 18
- Location
- Healdton Oklahoma/ SOOK
Try putting in 3phase and take measurements to neutral between each phase. Then phase to phase. Likely AM-VM switch needs exersise/cleaning
- 16,671
- 23,836
- 113
- Location
- Burgkunstadt, Germany
Partner, you got to start at the beginning. First step is the above question. Second one the manuals. I once spent 5 hours troubleshooting a problem, only to find that a switch was in the wrong position. I felt pretty stupid.
reboot
New member
- 11
- 0
- 1
- Location
- Grafton/IL
![IMG_0503[1].jpg](https://www.steelsoldiers.com/data/attachments/473/473825-7b801cf48d89a096af80bf19a45285d1.jpg "IMG_0503[1].jpg")
Attachments
![IMG_0506[1].jpg](/data/attachments/473/473827-3547a3b3f46d0f9cb13b3c234543b9a3.jpg)
- 400
- 23
- 18
- Location
- Healdton Oklahoma/ SOOK
That changes things a bit. If you are relying simply on the instrumentation on generator and not a multimeter to verify. Never truely trust these until you have validated them with external device.
You know to toggle the interrupt switch up after starting right? If it doesn't measure 240 between L1 and L3 after that try exercising the selector switches as has been said.
Howdy,
OK, 1 phase 120/240 and a ground rod in the ground with ground wire attached for safety.
You are looking at the gauges only? Get a volt meter and see what the reading is on the power lugs. You might have some issues with the factory am/vm switch itself or wiring issues.
Start the unit
set throttle for a nice 61Hz, with the voltage to a good 120v
switch the interrupt closed
take readings with multi-meter between all lugs
Now, do you have 120v and 120v on each L1 and L3?
Age old issues which has been discussed here on the forums. The Meter selector switch has cob webs. A good electrical contact cleaner and moving the switch back and forth and all over a bunch, I mean a bunch of times, might be enough to have the meter working. You might also follow the wire leads and make sure they are attached, not loose, etc...
OK, 1 phase 120/240 and a ground rod in the ground with ground wire attached for safety.
You are looking at the gauges only? Get a volt meter and see what the reading is on the power lugs. You might have some issues with the factory am/vm switch itself or wiring issues.
Start the unit
set throttle for a nice 61Hz, with the voltage to a good 120v
switch the interrupt closed
take readings with multi-meter between all lugs
Now, do you have 120v and 120v on each L1 and L3?
Age old issues which has been discussed here on the forums. The Meter selector switch has cob webs. A good electrical contact cleaner and moving the switch back and forth and all over a bunch, I mean a bunch of times, might be enough to have the meter working. You might also follow the wire leads and make sure they are attached, not loose, etc...
- 16,671
- 23,836
- 113
- Location
- Burgkunstadt, Germany
In the position that the S8 (voltage reconnection switch) is in the picture, you should have 120 volts Between L1 and N, and between L2 and N. Between L1 and L2 you should have 240 volts. Measure at the output terminals.
Worry about the meter later. First see if the output is right. On the data plate below S8, it tells you what position the S8 switch is in, and what voltage you should get at what terminal. If the output is right, then use S6, to check to see if you get the same voltages at the same S8 positions.
On on step at a time.
Worry about the meter later. First see if the output is right. On the data plate below S8, it tells you what position the S8 switch is in, and what voltage you should get at what terminal. If the output is right, then use S6, to check to see if you get the same voltages at the same S8 positions.
On on step at a time.
Last edited:
- 16,671
- 23,836
- 113
- Location
- Burgkunstadt, Germany
My bad!! Your right. Asleep at the wheel again.