SLLU336A May   2021  – January 2022 MCT8316A

 

  1.   1
  2.   2
  3.   3
    1.     4
      1.      5
      2.      6
      3.      7
        1.       8
        2.       9
        3.       10
  4.   11
    1.     12
    2.     13
      1.      14
    3.     15
      1.      16
    4.     17
      1.      18
    5.     19
    6.     20
      1.      21
      2.      22
      3.      23
      4.      24
  5.   25
    1.     26
      1.      27
      2.      28
      3.      29
    2.     30
      1.      31
      2.      32
    3.     33
      1.      34
      2.      35
      3.      36
      4.      37
      5.      38
      6.      39
      7.      40
      8.      41
      9.      42
      10.      43
      11.      44
      12.      45
      13.      46

3.6.1 Abnormal Speed [ABN_SPEED]

MCT8316A monitors the speed continuously by calculating difference in time between subsequent back-EMF zero crossings. This fault gets triggered when motor speed exceeds abnormal speed threshold [LOCK_ABN_SPEED]. When the motor gets stuck in the first electrical cycle, device continues to commutate at frequencies above the configured abnormal speed threshold [LOCK_ABN_SPEED].

When this fault gets triggered, follow below recommendations.

  1. Increase align time [ALIGN_TIME].

  2. Decrease slow first cycle frequency [SLOW_FIRST_CYC_FREQ]

  3. Decrease open loop acceleration A1 [OL_ACC_A1] and open loop acceleration A2 [OL_ACC_A2].

  4. Decrease closed loop acceleration [CL_ACC]