88 ADV200 • Functions description and parameters list
0 Encoder 1
1 Encoder 2
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
17.38 2172SpdFbkLosscode UINT32 0 0 0 ER FVS
The Speedfbkloss alarm generated by an encoder fault is displayed. As each type of encoder generates the
alarm differently (incremental signal error, absolute signal error, serial error), this parameter displays informa-
tion about the alarm that has occurred. If there are several, simultaneous causes, these are shown in this
parameter.
Bit Value Name
0 0x01 CHA
1 0x02 CHB
2 0x04 CHZ
3 0x08 MOD_INCR
4 0x10 MOD_ABS
5 0x20 CRC_CKS_P
6 0x40 ACK_TMO
7 0x80 DT1_ERR
8 0x100 Error Setup
10..15 Free
16..31 Depending on the type of feedback.
For further details please refer to the description of the Speedfbkloss alarm and the “9.2.1 Speed fbk loss
alarm according to the type of feedback” chapter of ADV200 QS manual.
Note ! To interpret the causes of the alarm correctly, you will need to convert the hexadecimal code written in parameter 17.29 SpdFbk-
Losscode, PAR 2172, into the corresponding binary code and then use the table of the encoder being used to check the various
active bits and relative description.
Example with Endat encoder:
PAR 2172 = A0H (hexadecimal value)
A0 is not present in the value column of the “ Speedfbkloss [22] with absolute EnDat encoder” table.
A0 must be seen as a bitword meaning A0 -> 10100000 -> bit 5 and bit 7. This indicates the simultaneous
intervention of the following causes:
Bit 5 = 20H Cause: disturbed SSI signals cause a CKS error or Parity
Bit 7 = 80H Cause: Encoder has detected malfunction and signals this to the drive via Error bit. Bits 16..31
contain the type of malfunction detected by the encoder.
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