Category: General Maintenance

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HDT 80 – Comm Error

Justen from CLS called and said the remote was showing Comm Error.  Talking with Tomas, it is the data being sent from receiver to the remote (transmitter) for the display.  Check the connection at the receiver with the red antenna for loose or corrosion at the connection.  Also, check inside the remote there is an antenna that can come loose or fall off.  If all looks good, need to replace both receiver and transmitter.

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Field Testing 3 Phase Electrical Motors

Pictured is a standard “Wye” connection.  First test is the “megger” test which measures resistance to ground.  Should be 800-900 Mega ohms (MΩ) resistance (our tester reads up to 500 Mega ohms)

  1. Connect megger to V1 and to Ground.  Run test, should exceed 500MΩ
  2. Connect megger to V2 and to Ground.  Run test, should exceed 500MΩ
  3. Connect megger to V3 and to Ground.  Run test, should exceed 500MΩ

In theory they all share the neutral in the middle, and testing only 1 leg should be sufficient, but this isolates each leg

Next test is a resistance of the windings for each leg

  1. Resitance test should be between V1 → V2, V2 → V3, V1 → V3  and all values should be the same.  Corrosion on terminal connections may result in different values, but should all be very close (within .5 Ω to .05 Ω)

Final test would be current draw on each leg, but would require an amperage clamp and ability to run motor continuously.

  1. I of V1 = I of V2 = I of V3 “should” all be equal