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  1. Replies
    79$$
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    140820-1327 EDT GITRDUN: As an experiment I...

    140820-1327 EDT

    GITRDUN:

    As an experiment I would try a transient limiter on the secondary side of the main transformer on the output of what is labeled "Main Transformer" breaker..

    Nominal...
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    79$$
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    140820-1000 EDT GITRDUN: You did not...

    140820-1000 EDT

    GITRDUN:

    You did not indicate the year of the machine.

    Almost certainly these are pullup resistors. Because they are 10 K and in a multi-resistor package. I suspect it was...
  3. 140820-0957 EDT It is simple. Do the...

    140820-0957 EDT

    It is simple. Do the calculations and indicate your answers. There are three answers.

    .
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    79$$
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    140819-0850 EDT GITRDUN: With reference to...

    140819-0850 EDT

    GITRDUN:

    With reference to your post #69.

    More information is needed.

    What specific breaker tripped? What resistor failed? What was the resistance, power rating, and type...
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    19$$
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    140817-2345 EDT Paul: Neither device is...

    140817-2345 EDT

    Paul:

    Neither device is being backfed by a parallel connection. Backfed in this case would require the output voltage to be higher than the input voltage.

    There may be some...
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    79$$
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    1,892

    140817-21027 EDT GITRDUN: With your above...

    140817-21027 EDT

    GITRDUN:

    With your above information I will look at the HAAS diagrams and see if there is any logical indication of what happens.

    Since only the "Main Transformer" breaker...
  7. Thread: Odd transformer

    by gar
    Replies
    7$$
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    385

    140817-0936 EDT Two Signal transformers...

    140817-0936 EDT

    Two Signal transformers ICT-H-A-20 connected to produce about 80 V from 480 can be used to generate a buck voltage for your desired about 400 V. If I interprete the information...
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    79$$
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    1,892

    140816-1113 EDT iceworm: In the HAAS...

    140816-1113 EDT

    iceworm:

    In the HAAS machines:

    The true MAIN breaker is the disconnect/breaker that is generally 30 to 40 A at 230 V 3 phase, and higher on some machines. Half that in 460 V...
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    79$$
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    1,892

    140816-0916 EDT Little Bill: Do not stop...

    140816-0916 EDT

    Little Bill:

    Do not stop participating. When you do not understand something, then many others may have the same problem or questions. Your participation will probably help you...
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    79$$
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    1,892

    140815-2347 EDT Little Bill: GITRDUN has...

    140815-2347 EDT

    Little Bill:

    GITRDUN has about 6 HAAS machines for CNC mills, and lathes that are Okuma. I can only talk in detail about the HAAS machines because we have 6 of them.

    ...
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    79$$
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    140815-2140 EDT kwired: The main...

    140815-2140 EDT

    kwired:

    The main disconnect/breaker is a breaker and is the only OCP for the high power loads (main spindle and servo drives).

    Under normal operating procedure there is never...
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    79$$
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    140815-2111 EDT GITRDUN: In all of our HAAS...

    140815-2111 EDT

    GITRDUN:

    In all of our HAAS machine, except possibly one, there is no load connected directly to the output of the main disconnect/breaker, except the small amount of circurity...
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    79$$
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    140815-1040 EDT iceworm: What are the...

    140815-1040 EDT

    iceworm:

    What are the "these" that you want to see?

    .
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    79$$
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    140815-0913 EDT GITRDUN: I believe your...

    140815-0913 EDT

    GITRDUN:

    I believe your troubleshooting idea was to power down the CNC, open the disconnect, check the state of the breakers, put all breakers in the off state, close the...
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    79$$
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    1,892

    140813-2138 EDT GITRDUN: The HAAS large...

    140813-2138 EDT

    GITRDUN:

    The HAAS large main disconnect is also a breaker. Look at the disconnect's handle and you will see the ampere rating.

    Look at the information in any of your HAAS...
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    79$$
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    1,892

    140813-1525 EDT iceworm: The small...

    140813-1525 EDT

    iceworm:

    The small breakers, in contrast to the large main disconnect/breaker, I do not believe have a tripped state different than the off state. In otherwords similar to a...
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    79$$
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    1,892

    140813-1441 EDT GITRDUN: Late yesterday I...

    140813-1441 EDT

    GITRDUN:

    Late yesterday I recorded some information from several of our HAAS machines, but did not have time to correlate with the circuit diagrams in the HAAS manuals.

    ...
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    79$$
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    140813-0915 GITRDUN: A HAAS or other CNC...

    140813-0915

    GITRDUN:

    A HAAS or other CNC machine is a big chunck of cast iron, varoius steels, and sheet metal. There is some wiring that is not totally enclosed within this metal structure,...
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    79$$
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    1,892

    140811-0859 EDT We have had one or more of...

    140811-0859 EDT

    We have had one or more of FU1-3 blow in a lightning storm.

    .
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    79$$
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    140811-0814 EDT starbolin has a good question....

    140811-0814 EDT

    starbolin has a good question. What changed from a time when there was no problem to the time when failures began?

    Some minor corrections to my previous comments. The transient...
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    79$$
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    140810-1345 EDT GITRDUN: Our 1994 HAAS has...

    140810-1345 EDT

    GITRDUN:

    Our 1994 HAAS has only 3 Transorbs while an about 2000 machine has 6 Transorbs. The 400 V threshold of the Transorb on our 2000 machine would blow at least one of the...
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    79$$
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    140809-1523 EDT GITRDUN: I can not directly...

    140809-1523 EDT

    GITRDUN:

    I can not directly address the Okuma machines, but I can the HAAS machines.

    Do not use a secondary grounding device (ground rod) at a CNC machine. Use only the EGC...
  23. Thread: Dead end switch

    by gar
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    8$$
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    465

    140808-2145 EDT joe2511: Are the contactors...

    140808-2145 EDT

    joe2511:

    Are the contactors solid-state or controlled by a small solid-state relay? If so, then capacitive coupling between the wires in the two wire switch circuit could...
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    79$$
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    1,892

    140808-2100 EDT GITRDUN: Indicate the CNC...

    140808-2100 EDT

    GITRDUN:

    Indicate the CNC manufacturer's name, what is the internal circuit in ths CNC. I assume the CNC is a delta load. This means any 3 phase induction motors are delta...
  25. Thread: Blinking Lights

    by gar
    Replies
    94$$
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    3,968

    140727-2230 EDT markstg: In posts 28, and...

    140727-2230 EDT

    markstg:

    In posts 28, and 31 I suggested you try a GE dimmable CFL. This may not meet some other criteria, but I believe you will see much less flicker.

    In post 34 I provided...
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