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Old 12th April 2013, 10:44 PM   #6691
cjf is offline cjf  United States
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Hello yes, AC is grounded on the back of the chassis just below the IEC Input
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Old 12th April 2013, 10:51 PM   #6692
troystg is offline troystg  United States
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Couldn't see in the picture.. try ohming out from iec ground to the star ground then iec to xlr then nampon...
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Old 12th April 2013, 11:54 PM   #6693
cjf is offline cjf  United States
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Thanks for your assistance on this. Not sure what you mean by ohming out though? What I have done was use multimeter on continuity setting where a "Short" produces a beep. I took these measurements with one Probe on the IEC earth pin and the second probe on the following points below:

Chassis: result --Beep
PIN1 on XLR: result --Beep
Ring Terminals at Star bolt on chassis: result --Beep
Steel jacket of Input signal cable near the point it attaches to NC400: result --Beep
Steel jacket of Input signal cable near the point it attaches to PIN1: result --Beep
Bare back panel of inside chassis where XLR and speaker terminals pass thru: result --Beep
Base of chassis around NC400 base plate: result --Beep
Metal standoff foot of SMPS600's: result --Beep

This Bleeping thing appears to be well tied together at all points
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Old 13th April 2013, 02:27 AM   #6694
troystg is offline troystg  United States
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You would be dead on.. If you got good beeps at all those points then the only other thing you can check is the cable harness plugs to make sure they are all seated well.

You might be able to check the voltages from the smps to see if there is a problem but that would be unexpected.

After checking the harness plugs it would then need to be a ticket / case with Hypex.
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Old 13th April 2013, 03:24 AM   #6695
cjf is offline cjf  United States
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Ok, I just finished up my second dual mono amp and am testing it now to see if it has similar issues. It's a mirror build of the other one.

I'll report back the results. If all goes well with this one then I guess I'm another lucky one who received a module with current protection set by a timid hand. If it were a ham fisted American setting the dials there would have probably been an issue on the opposite side of the spectrum...
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Old 13th April 2013, 06:11 AM   #6696
Julf is offline Julf  Europe
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Quote:
Originally Posted by troystg View Post
Is the AC grounded? If the chassis is floating the the nampon is not being pulled to ground.
The AC safety earth is only for safety. NAMPON needs to be connected to signal ground (pin 4 on J9, audio input - so the shield on the audio input wire). It doesn't matter if it is connected to the chassis or not.

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For the XLR Inputs, I have PIN1 connected to the steel jacket of the NC400 Input signal cable. Also connected to PIN1 is a solid core 20ga wire which is then attached to chassis ground. NAMPON is also attached to the same point of chassis ground as PIN1.
Sounds OK.
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Old 13th April 2013, 06:16 AM   #6697
Julf is offline Julf  Europe
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You might be able to check the voltages from the smps to see if there is a problem but that would be unexpected.
So you guys have actually connected up your amps without first checking that the power supply voltages are OK? Very brave...
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Old 13th April 2013, 02:36 PM   #6698
troystg is offline troystg  United States
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Like in PC's, some SMPSs don't come on unless they are connected to the load therefore checking them before hand is impossible. A linear PS would no doubt be checked before connection. But since an SMPS is machine made to exacting specifications the chance of it being off is slim. And if it were bad it and the NCore unit would be under warranty for the first tun on / light show... :-)
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Old 13th April 2013, 02:55 PM   #6699
Julf is offline Julf  Europe
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Like in PC's, some SMPSs don't come on unless they are connected to the load therefore checking them before hand is impossible.
Not impossible, it just needs a couple of high-power resistors or maybe even a couple of light bulbs - that's how I tested mine.
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Old 13th April 2013, 03:13 PM   #6700
troystg is offline troystg  United States
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impracticable, not impossible...
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