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Type: Posts; User: fifty60

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  1. Replies
    11$$
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    I deal with mainly 2 different HMI screens. They...

    I deal with mainly 2 different HMI screens. They are both operated off of 24VDC power supplies. The power input to one of the HMI's is +, -, and FG. The power input to the other HMI is only + and...
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    11$$
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    The power supply is Class 2 24VDC. The power...

    The power supply is Class 2 24VDC. The power inputs for the HMI touch screen are "+" "-" and "FG".

    The FG should stand for functional ground. We currently use a shielded cable to supply the +...
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    11$$
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    Understood, but how can the metal casing of the...

    Understood, but how can the metal casing of the USB connector touching the painted equipment enclosure cause my SD card to fail?
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    The HMI is powered from a floating 24VDC power...

    The HMI is powered from a floating 24VDC power supply. The shield of the power cable is connected to the functional ground input on the HMI on one end, and then connected to the equipment ground on...
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    SD Card Failure

    I have an HMI screen that has a 2GB MLC memory card. The card is not a brand name card.

    I am seeing quite a few of these cards fail in the field, but never on the same screen. Can anyone offer...
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    The rental route appears to be the way to go for...

    The rental route appears to be the way to go for the LISN's. The equipment is 4-wire single phase (Line-Line-Neutral-Ground). I would need a LISN for each Line and one for the neutral. So I would...
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    PRE Compliance Testing for EMC

    I am trying to purchase test equipment to perform pre-compliance testing for conducted emissions. I need to test between 100kHz and 2MHz.

    I have found a nice Com-Power SPA-815TGE (rebranded...
  8. Thread: NFPA 30

    by fifty60
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    125

    Thanks, that helps.

    Thanks, that helps.
  9. Thread: NFPA 30

    by fifty60
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    NFPA 30

    Can someone please help me find where in NFPA 70 it directs you to use NFPA 30 for hazardouls laboratory locations? Is it somewhere in article 500?
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    Gar, the PLC is an Idec FC5A-D16RS1 here is...

    Gar, the PLC is an Idec


    FC5A-D16RS1 here is a link to their website http://catalog.idec.com/australiaf/datasheet.asp?PN=FC5A-D16RS1&FAM=PLCs&P=2955,2980
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    23$$
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    It a 24VDC digital input, no resistor, just a...

    It a 24VDC digital input, no resistor, just a set of contacts...
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    Multi- Listed Wiring

    If wire is marked as MTW and TFF, am I limited by the TFF or can I use it in any application that could use MTW?

    For example, I have one 14AWG wire that is MTW/THW, and a 16AWG wire that is...
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    Motor Nameplate

    I've asked questions similar to this before, but I am now trying to drill down a little bit further towards a complete understanding.

    If I have a machine that has two 20HP refrigeration...
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    Gar, this is a relay inside of a control system...

    Gar, this is a relay inside of a control system mounted on a motor. To change the relay, I would have to change the motor. I could run their relay into another relay with a lower wetting...
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    Yes, the voltage is 24VDC. I need to make sure...

    Yes, the voltage is 24VDC. I need to make sure the 24VDC is not getting into the input of the PLC right, which is only rated for 7mA. Is the 248 ohms used to form a current divider with the input?
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    Wetting Current/PLC Input

    I have a PLC input that has a rated current of 7mA. I have a contact from a relay that has a minimum wetting current of 100mA. Is there any way to reliably use this contact with this PLC input?
  17. Replies
    7$$
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    The wiring connections says "power supplied may...

    The wiring connections says "power supplied may be 24 volts AC or DC." But the rest of the documents talks about the transformer which would be AC...

    If I can use DC, I would float the output and...
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    Interface Board

    I am preparing to use this interface board http://sporlanonline.com/literature/100/ca/100-50-2.pdf.

    The installation directions keep calling for a 30VA transformer. Is there any reason why a...
  19. Thread: Yellow Wire

    by fifty60
    Replies
    10$$
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    478

    It also says I can use orange color markers...

    It also says I can use orange color markers throughout the length of the conductor. Would affixing orange tape every few feet suffice for this requirement?
  20. Thread: Yellow Wire

    by fifty60
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    I am a little hesitant to use the same color wire...

    I am a little hesitant to use the same color wire (orange) for ungrounded AC and DC conductors...but that appears to me what the NFPA79 is saying
  21. Thread: Yellow Wire

    by fifty60
    Replies
    10$$
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    478

    It seems to me like NFPA79 is saying that I can...

    It seems to me like NFPA79 is saying that I can use the single orange stripe (orange tape) at the termination end for the grounded AC conducters. But for ungrounded conductors (AC and DC) they will...
  22. Thread: Yellow Wire

    by fifty60
    Replies
    10$$
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    478

    It appears to me that NFPA79 is saying that you...

    It appears to me that NFPA79 is saying that you can either use a colored conductor, but that you do not have to. it says that a stripe at the termination is sufficient.

    Am I interpreting this...
  23. Replies
    5$$
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    The disconnects I use come with the J-Clips...

    The disconnects I use come with the J-Clips fitted, or otherwise they have to use the FRS fuses. First time i have had to use the FRS's. I needed a 30A with a J-clip but to get the clip fitted from...
  24. Thread: Yellow Wire

    by fifty60
    Replies
    10$$
    Views
    478

    That is correct. So only he ungrounded leg of...

    That is correct. So only he ungrounded leg of the receptacles 110V power input should be Orange. The grounded leg, even though it is derived from another source, should remain white. Does that...
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    Type J fuse vs RK5 Fuse

    Both of these fuses are dual element-time delay fuses. Can anyone suggest why I would use one type of fuse instead of the other?

    I typically always use the LPJ fuses, but all I have availaible...
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