Recent content by SMF

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    Allen Bradley Powerflex 753 VFD faulted

    Hi everyone, I was tasked to bring the faulted Allen Bradley Powerflex 753 back in service. I have two identical drives each controlling it's own motor independent of each other and installed at the same time (4 yrs ago). Looking through the parameters on the good drive I noticed that...
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    Need assistance verifying calibration on a flow meter.

    Thanks for your time.
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    Need assistance verifying calibration on a flow meter.

    Dave, I trying to follow the math and as printed it looks good but I can't figure out how you are finding the generated percentage ( ie 6.25%, 25%, 56.25%). Please explain.
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    Need assistance verifying calibration on a flow meter.

    HI David, The LRV=0, URV=1200 eng units programmed in the IDP-10 are cubic feet per minute. There must be an internal conversion taking place from the pressure against the diaphragm converting the signal to cubic feet per minute because there are no pressure eng units available only volumetric...
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    Need assistance verifying calibration on a flow meter.

    Hi everyone, I need to verify the calibration of a Foxboro IDP-10. It's measuring low pressure header air at 7 psi and the range of the meter is 0-1200 CFM. The meter is using the square root extractor which is preventing me from checking the cal. I would like to check at 25% (375 cfm) 50% (750)...
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    Bubbler for level indication

    My mistake the pressure transmitter is a Foxboro IDP10 with a range of 0-200 inches of water. This transmitter is used in conjunction with an identical IDP10 as a differential level indication. The transmitter I'm concerned about I'll call X2 the low side of the weir and the other transmitter...
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    Bubbler for level indication

    Hello friends, I have been tasked to verify if a bubbler system is operating correctly. The transmitter is a Foxboro IDP20 with a range of 0 to 120 in H2O. The structure with the process water in it is 8 feet in depth. I'm applying 20 psi of air at 1.5 liters/min. Whats got me concerned is...
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    Sizing RC Network for Contactor

    No solid state devices, standard 120 60hz.
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    Sizing RC Network for Contactor

    I want to put a RC network across both of the coils of two mechanically interlocked size one 120 vac contactors. Can you help me size this network? Looking at different networks they can have varying resistance and capacitive values. The contactors in question change state a couple times a...
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    Transformer Liquid Level Gauge

    Why is there a 25'C marking midway between Low and High on a liquid level gauge on transformers? Is the oil expanding and contracting with temperature and the needle showing the approximate tank level with respect to the oil temperature? Thanks for your input.
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    SLC 500 COP Instruction to N Register

    I have this COP instruction with a 8 word length with a destination of N7:211. I have very very limited descriptions within the program and need to find all the places that N7:216 is used. When I do a program search for N7:216 the reply is N7:216 not found. When online I see the values of 216...
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    SLC 500 MOV Instruction

    I looked through he 1746-NI8 manual and a range was shown for Proportional counts (-32,768 to + 32767 range). could this be what's being referenced and how do I verify this is the Data type being used? Am I thinking this through to much and should I use 16000 as 15 feet as 12 mA and so on or is...
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    SLC 500 MOV Instruction

    I'm using RSLogix 500 and have a MOV instruction with a N13 register, and the source has a constant of 32000. Can you tell me where this 32000 number came from? is it selectable somewhere? I know the programmer is equating it to a 0-30 foot 4-20 analog input signal. I don't want to change this...
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    Simulation Test PLC

    Hi friends, I want to do some practice ladder logic programming/testing in my spare time at home and need some help selecting a PLC and I/O with free full featured software. I'm looking to use AI, AO, DI, DO to start with. On the job SLC 500's are being used but I cannot afford the...
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    PLC Register Meaning

    FILE N17:0 LEN:40-COP-FILE #3 PROSOFT-1 I can make out most of this string but would like to know what "LEN" means and how it's used. Thanks.
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