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  1. #1
    Join Date
    Apr 2004
    Location
    Winnipeg,MB,Canada
    Posts
    104
    Post Likes

    Smardt/ tt400 compressor

    Replaced PWM module a month ago, original was not showing pressures or temperatures properly, no LEDs burning on backplane board, replaced module, powered up, LEDs lit properly, pressures reading like all others, customer powered chiller down until ready to start, powered up the other day, not reading pressure, not communicating, no LEDs on backplane, no 24Vdc, did buss harness test, ok, 549Vdc, 15Vac. Measure 11Vac at inverter supply, no 250Vdc out. Soft start mod? Inverter?

  2. #2
    Join Date
    Jan 2008
    Location
    Phoenix Arizona
    Posts
    1,561
    Post Likes
    PWM has nothing to do with readings. It drives the bearings. Bmcc and serial driver handle comm.

    Need way more info...

  3. #3
    Join Date
    Jan 2008
    Location
    Phoenix Arizona
    Posts
    1,561
    Post Likes
    Also there is a dc-dc converter verification in the manual.

  4. #4
    Join Date
    Apr 2016
    Location
    Maryland
    Posts
    238
    Post Likes
    GOOD LUCK TO YOU

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