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Type: Posts; User: fifty60

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    21$$
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    Looks like I am going to have to use the TTL. ...

    Looks like I am going to have to use the TTL. The RS232 protocol in not ModbusRTU. They have their own software implementation. Terrible. Why wouldn't they use Modbus RTU? I believe their RS232...
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    21$$
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    10119Still trying to figure out how to do this by...

    10119Still trying to figure out how to do this by pretty much only looking at the manual. I do not have the power supply yet to physically try to set it up. I have a DB-25 connector on the back of...
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    21$$
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    Here is a link to the power supply if anyone is...

    Here is a link to the power supply if anyone is interested. http://www.chromaate.com/product/62000H_series_Programmable_DC_Power_Supply.htm

    I'm not sure if I will be able to use the 12VDC on pin...
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    So instead of using the TTL input, I may be...

    So instead of using the TTL input, I may be better of adding an RS232 card to my PLC and shutting it off that way.
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    The problem I have are integrating zener diodes,...

    The problem I have are integrating zener diodes, capacitors, or resistors into my sub panel design. I generally only work with complete electronic components like relays, ssrs, contactors, and not...
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    Ground Size In Europe

    Per the NEC we can size the equipment grounding conductor smaller than the main service conductors. I am reading in a European standard that the terminal for the Equipment Grounding Conductor...
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    21$$
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    sorry repeat, please see above post

    sorry repeat, please see above post
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    21$$
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    Sorry about stating the RS232, it is a 168 page...

    Sorry about stating the RS232, it is a 168 page manual dropped on my lap and the first remote operation option I see is the DB-9 for the RS232. There is also a DB-25 titled "analog interface" that...
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    I actually only need a TTL logic signal to shut...

    I actually only need a TTL logic signal to shut down the remote equipment. I do not have TTL voltage levels available, but I think all I will need is a 5V output power supply and a bifurcated gold...
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    RS232/RS485 COMMUNICATION SOURCE

    I have a power supply that I need to have shut down if my equipment experiences an alarm. There are no digital inputs on this equipment. There are RS232,RS485, and Ethernet communications ports on...
  11. Thread: SCCR QUESTION

    by fifty60
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    11$$
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    270

    My concern is not so much the chord attached to...

    My concern is not so much the chord attached to the equipment, but the individual conductors inside of the equipment. I get concerned when I see 16AWG on a piece of equipment that plugs into a 120V...
  12. Thread: SCCR QUESTION

    by fifty60
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    11$$
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    I am trying to determine what is acceptable safe....

    I am trying to determine what is acceptable safe. It is still plug in equipment. it is powered off of a 20A 120V circuit. My "Code and standard" experience has always indicated that I would need...
  13. Thread: SCCR QUESTION

    by fifty60
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    11$$
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    270

    I am clear on what a Power circuit is when...

    I am clear on what a Power circuit is when compared to a control circuit...until we get to chord connected equipment. After reading through NFPA 79 again, I am still confused. Would motors and...
  14. Thread: SCCR QUESTION

    by fifty60
    Replies
    11$$
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    270

    No, I do not know the KVA of the service...

    No, I do not know the KVA of the service transformer. The equipment is marked with the 5KA SCCR and it is up to the customer to go from there. My concern is the 2KA SCCR outlet that I plug an IEEE...
  15. Thread: SCCR QUESTION

    by fifty60
    Replies
    11$$
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    Would the same logic apply for chord connected...

    Would the same logic apply for chord connected equipment? I am not certain how to differentiate chord connected equipment from permanently connected mains equipment. In most of the permanently...
  16. Thread: SCCR QUESTION

    by fifty60
    Replies
    11$$
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    SCCR QUESTION

    I have a piece of lab equipment that employs hermetic compressor and nichrome heaters. I have a mains circuit of 480V that is separated from a control circuit of 115VAC by a general purpose...
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    3$$
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    There are not any technical reasons behind these...

    There are not any technical reasons behind these exceptions?
  18. Thread: USB Question

    by fifty60
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    USB Question

    Would it introduce noise if a metal inclosure was able to make direct contact with the metal housing of male usb connector? A panel mount USB is constructed in such a way that the metal enclosure of...
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    [QUOTE=ritelec;1559658]The heater load @ 1.25...

    [QUOTE=ritelec;1559658]The heater load @ 1.25 determines the circuit size.
    The heater overload is for overcurrent protection. The overcurrent protective device is for short circuit and ground fault...
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    The heaters do have thermal cutouts, thermostats,...

    The heaters do have thermal cutouts, thermostats, or limit controllers to protect against overloads. But even if they did not have this, I can't use an OCPD as an overload? The only way I could...
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    Standard Circuit Breaker Sizes

    NEC 240.6 lists the smallest "fuse or inverse time breaker" as 15A. It then lists some smaller standard "fuse" sizes. Does this mean that a heating load does not have less than a 15A circuit...
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    To clarify, I am looking for strain relief to...

    To clarify, I am looking for strain relief to install on the wires that enter the probe. There is no NPT.
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    NEC 440.4 B) Exception No. 3

    Can someone please give me some insight as to why this exception exists? "Multimotor and combination load equipment used in one and two family dwellings, cord and attachment plug connected...
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    Conduit and Strain Relief

    I am trying to install the below RH sensor. I would like to find some conduit for the wires and some strain relief for the wires coming out of the actual sensor. The transmitter will be installed...
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    UL Recognized VS Listed For Motors

    I know that the backwards RU marking means that a product is UL recognized, and that this is different than actually being UL listed. I know the UL recognition means that the product is approved to...
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