Bridgeport boss 4 Spindle not powering up (continued)

Thanks for the helpful suggestions regarding my Boss 4 spindle not
powering up problem. Here is some more information:

The Spindel does easily Rotate
The Belt is fine
The problem is not low spindle oil

I went through the Bridgeport troubleshooting process and checked the
following: Power after main fuses, power after Transformer 1, power
after transformer 2, 24 VDC. DC power output at bridge rectifier, 56
VDC supply, All the regulated and unregulater logic power supply
voltages.

Potential issues:

The rear Fan does not operate
the spindle overload (1MOL) kicks out every once in awhile and needs to
be reset. (1 MOL picture in metalworking dropbox boss_4_to_motor just
bnarely out of picture in upper left)
When spindle is turned on, voltages going to the spindle motor is not
240V, between T1 and t2 it is 220V, betwenn t2 and t3 it is 240V and
between T1 and t3 it is 160V.
When spindle is turned on, power after the 3 main fuses is also low,
same values as above.

Problems with instructions:

I got a response from Dennis in NCA that I could not follow. He said:

If you have the proper power coming into the contactor I would
disconnect the 3 output wires to the overload, try to activate the
spindle motor, and check to see if you have power passing through all 3
internal contacts to the output terminals you've disconnected. The
reason for disconnecting the wires is to prevent a false reading on any
of the terminals which can be caused by power flow through the motor.
If all you get is buzzing from the contactor at this point you may have
a bad coil in your contactor.

So If the heaters are where I think they are, (3 orange cylinders in
metal working drop box, boss4_back) then there are actually 6 wires
coming out of it, not 3. I tried disconecting all 6 and doing as
instructed, with no effect.

Another problem with an instruction I got in the manual "Check all
contacts to the logic boards and terminal strips" Does that mean check
for continuity across all terminals?

So I hope this is enough info for some saint out there to help me out,
I really don't want to call inthe $100 tech.

Thanks Jak

.

Relevant Pages

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    ... The problem is not low spindle oil ... Power after main fuses, power after Transformer 1, power ... voltages going to the spindle motor is not ... disconnect the 3 output wires to the overload, ...
    (rec.crafts.metalworking)
  • Re: Best practice for mill VFD control wiring
    ... output power on E-Stop. ... That way you keep your controls but disconnect ... Unfortunately -- the power for the spindle motor, ...
    (rec.crafts.metalworking)