Message Data Mistake Detection - PENN Controls - VFD68Bxx - VFD68Cxx - VFD68Dxx - Three‐Phase Motor Speed Controller - VFD68 Three‐Phase Variable Frequency Drive

VFD68 Variable Frequency Drives Technical Bulletin
Product
Document type
Technical Bulletin
Document revision
C
Revision date
2019-08-09
Part number
24-7664-3051

To detect the mistakes of message data from the master, error items are checked for the errors in Table 1. If an error is detected, a trip does not occur.

Table 1. Message Data Mistake Detection
Error Item Error Description VFD Operation
Parity Error The data received by the VFD differs from the specified parity (P.120 setting).

  1. P.343 increases by 1 at the error occurrence.

  2. The terminal LF is output at an error occurrence.
Framing Error The data received by the VFD differs from the specified slop bit length (P.120).
Overrun Error The following data was sent from the master before the VFD completes receiving data.
Message Frame Error The message frame data length is checked, and the received data length of less than 4 bytes is regarded as an error.
CRC Check Error A mismatch found by CRC Check between the message frame data and calculation result is regarded as an error.