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Type: Posts; User: masonlc

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  1. Replies
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    I have done a time of day demand limit for a...

    I have done a time of day demand limit for a customer who wanted to "chase the peak". It's kind of a brute force way to do it, and it actually worked for a few weeks until word got out and then...
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    Is the trend setup with a sample interval or a...

    Is the trend setup with a sample interval or a COV (change of value)?

    The default for a trend is a sample interval of 5 minutes, so if that was never changed, a setpoint adjustment at 12:01 won't...
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    The first complaint was a lack of static...

    The first complaint was a lack of static pressure, while troubleshooting I switched to bypass while the drive was running at 60hz and heard the motor speed up. I verified it with an amp clamp just to...
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    VLT6000 Thanks! I'll try the optimization,...

    VLT6000

    Thanks! I'll try the optimization, I've already run the AMA (that was my second troubleshooting step after verifying all the settings were correct).

    3.03 and 4.14 are what I changed to...
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    That sounds promising. I'm looking through the...

    That sounds promising. I'm looking through the manual, but I don't see it.

    BTW, these drives are powering AHU fans and it's happening on 2 projects, one retrofit and a new install with Trane AHU's...
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    According to the manual, the default switching...

    According to the manual, the default switching frq is 5 kHz. I'll have to verify in the field, but I did not change it.
    I used a true RMS meter to check the current, but I didn't think to verify the...
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    Danfoss VFD issue

    I have had a spate of Danfoss VFD's that run the motors slower at 60 Hz than when the motors are in bypass. I have found a workaround by "overclocking" the drives to run at 75 - 80 Hz which produces...
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    N30 Display Issue

    I'm setting up the display on an N30 and have found that on my AHU's the Duct Static Pressure is not updating. It pulls a value in upon initialization, but never changes after that. I have it linked...
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    Thanks for the suggestions, I will try them next...

    Thanks for the suggestions, I will try them next time I'm out that way. There are only 2 UNT's at the site and they are in the same panel. They are both wired and configured the same way. The...
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    N30/UNT AI issue

    I have a UNT with a Zone Sensor controlling an AHU with an N30 supervisory controller. The N30 database lists the AI's as follows:

    AI 1 = Zone Temp
    AI 2 = Setpoint Adjust
    AI 3 = RA Temp
    AI 4 =...
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