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  1. Replies
    1$$
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    211

    MINI DIN 8P Pinout

    I am trying to find out the pin designations for a mini din8p RS232 cable. I need to find the TX, RX, DCD, DSR, CTS and GND. I know the pin, looking at the male side, count 1 through 8 starting...
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    1$$
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    264

    Determining Auto-Ignition Temperature

    I am trying to find the AIT's for diesel, indolene, heptane, and any fuels with ethanol and methanol. What is the official source to get the AIT's from?

    I can find Heptane, but no luck with...
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    4$$
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    316

    The T Code is referring to the maximum...

    The T Code is referring to the maximum temperature of any exposed surface, as required by 500.8(B)1, right?

    So can the actual process fluid temperature be any temperature, as long as the surface...
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    10$$
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    They loose communications to all of their...

    They loose communications to all of their machines when power is cycled to my machine. It is 2 wire RS485 for my machine, but I am not sure what the other machines are using.

    I can daisy chain...
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    Auto Ignition Temperature in Class I Div. I

    Per 501.135 I have to limit heater temperature to 80% of the auto ignition temperature (AIT). This is only applicable to Class 1 Div II chambers.

    For Class 1 Div I, is there no limit requirements...
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    RS485 Dropping Out

    There are several machines that are connected together via RS485, and are being controlled over the RS485 network by using Modbus commands.

    Everything works well, until one of the machines are...
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    Low Load on Switching Power Supply

    I have a 30W 24VDC switching power supply. The load on the power supply is less than 1W. Is this potentially damaging to the power supply?
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    3$$
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    341

    By intrinsically safe do you mean that I can...

    By intrinsically safe do you mean that I can treat it as a simple apparatus and add an intrinsic isolator or zener barrier to it?
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    341

    Simple Apparatus--Consume vs Generate

    A simple apparatus as devined by 504.2 NFPA70 2014 says the component cannot GENERATE more than 1.5V, 100mA, and 25mW.

    I am a confused about "consuming" vs "generating". A small alarm horn, for...
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    I could use a USB to to RS485 converter on the...

    I could use a USB to to RS485 converter on the first PLC, and then daisy chain the remaining PLCs using RS485 over RJ11 connectors. This would basically be the same as using RS485 to begin with, but...
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    7$$
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    456

    USB-RS485 Daisy Chaining USB

    I am currently stuck with a PLC that only has RS232 and RS485. I can easily add a USB to 232/485 converter. However, if I cannot use the USB to daisy chain several PLC's.

    RS485 simultaneously...
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    5$$
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    311

    Excellent, thanks for the explanation and...

    Excellent, thanks for the explanation and suggestions. I will take a look at all of the above.
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    5$$
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    311

    Spoke too soon. Found something here: ...

    Spoke too soon. Found something here:


    http://www.omega.com/pptst/CCT.html

    They seem to only take AC current...nothing for DC current?
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    5$$
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    311

    Current Signal Conditioner

    I am having a hard time finding a Current signal conditions. I want to monitor a 0-2A current signal and condition it so that it can be input it into a 4-20mA data logger. Does something like exist?
  15. Thanks for the information, it is helping me look...

    Thanks for the information, it is helping me look at this differently than I was originally. Also, what is the "mechanical code for workman's platform" requirement?

    Would it be a correct...
  16. The remote condensing unit is only a part of the...

    The remote condensing unit is only a part of the overall refrigeration equipment. So, looking at the equipment as a whole, the disconnect being located at ground level would be readily accessible as...
  17. Electrical Enclosure on Remote Condensing Unit

    The only item required to be "readily accessible" from the air conditioning and refrigeration equipment is the disconnecting means. This is per article 440.

    I am looking at a remote condensing...
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    8$$
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    Very interesting. I will take a look at UL 508A...

    Very interesting. I will take a look at UL 508A for future reference regarding modifying NEMA (brought to you by UL) rated enclosures. For this application, the UL (I really want to only mean NEMA,...
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    8$$
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    520

    Modifying Nema 4 enclosure

    If I add NEMA 3R vents to a NEMA 4 enclosure, is the overall enclosure now rated at NEMA 3R?

    I remember reading somewhere earlier that the rating took the lowest rating on the enclosure. I cannot...
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    14$$
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    Understood. Jraef, Gar. Thanks for the input...

    Understood. Jraef, Gar. Thanks for the input information. It has been a while since I have thought about efficiency and PF, that is my fault. I can figure out the rest with the direction you have...
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    14$$
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    Interesting. So the 100V is definitely the RMS...

    Interesting. So the 100V is definitely the RMS value, but you think the 1.7A may not be?

    1.7/Sqrt(2) = 1.2

    1.2 * 100 = 120 VA

    120 * (1 - .83) = 20VA

    Seems to be getting closer, but still...
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    14$$
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    813

    Heat Calculations of Electronic Components

    I have a 60W power supply. The spec sheet says that it is 83% efficient, draws 1.7A max on the input at 100VAC.

    1.7A * 100 = 170VA
    170VA * (1 - .83) = 28.9VA

    170 - 28.9 = 141.1 VA

    The...
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    5$$
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    443

    If the panel is located outside, you want to make...

    If the panel is located outside, you want to make all enclosure penetrations from the bottom, right, to route all condensation away from enclosure.

    If the enclosure has a disconnect switch, then...
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    443

    Electric Panel Layout

    Is there a general rule that all circuit breakers inside a sub panel should be at the top of the electrical enclosure? The only rules that I can recall, when they apply, that the circuit breakers...
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    9$$
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    Thanks for the explanation, much appreciated!

    Thanks for the explanation, much appreciated!
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