Speed Fbk Loss Alarm According To The Type Of Feedback - gefran ADL300 Installations

9.2 Speed fbk loss alarm according to the type of feedback

For the correct interpretation of the cause of the alarm trigger, it is necessary to transform the hex code indicated in parameter 15.13
SpdFbkLoss code, PAR 2172 , in the corresponding binary and verify in the encoder table that the active bits and related description are used.
Example with encoder Endat:
PAR 2172 = A0H
In the table "Speed fbk loss [22] alarm with absolute encoder EnDat" A0 is not indicated in the value column.
A0 should be contemplated as a bitword with meaning A0 -> 10100000 -> bit 5 and bit 7 . The following causes simultaneously intervene:
- Bit 5 = 20H Cause: the SSI signal interferences cause an error in the CKS or parity.
- Bit 7 = 80H Cause: The encoder has detected an incorrect operation and communicates it to the converter through the Error bit. Bits 16..31
present the type of incorrect encoder operation detected.
The value is displayed in hexadecimal format on the optional and standard keypad.
Speed fbk loss [22] alarm with digital incremental encoder
•
Bit Value Name Description
Cause: no impulses or disturbance on incremental channel A.
0 0x01 CHA
Solution: Check the connection of the encoder-drive channel A, check the connection of the screen, check the encoder supply voltage,
check parameter 2102 Encoder supply, check parameter 2104 Encoder input config.
Cause: no impulses or disturbance on incremental channel B.
1 0x02 CHB
Solution: Check the connection of the encoder-drive channel B, check the connection of the screen, check the encoder supply voltage,
check parameter 2102 Encoder supply, check parameter 2104 Encoder input config.
Cause: no impulses or disturbance on incremental channel Z.
2 0x04 CHZ
Solution: Check the connection of the encoder-drive channel Z, check the connection of the screen, check the encoder supply voltage,
check parameter 2102 Encoder supply, check parameter 2104 Encoder input config, check parameter 2110 Encoder signal check
• Speed fbk loss [22] alarm with sinusoidal incremental encoder
Bit Value Name Description
Cause: voltage level not correct or disturbance on signals of incremental channels A-B.
3 0x08 MOD_INCR
Solution: Check the connection of the encoder-drive channels A-B, check the connection of the screen, check the encoder supply voltage,
check parameter 2102 Encoder supply, check parameter 2108 Encoder signal Vpp.
Speed fbk loss [22] alarm with SinCos encoder
•
Bit Value Name
3 0x08 MOD_INCR
4 0x10 MOD_ABS
ADL300 - Fast installations and commissioning
(hex value)
Description
Cause: voltage level not correct or disturbance on signals of incremental channels A-B.
Solution: Check the connection of the the encoder-drive channels A-B, check the connection of the screen, check the encoder supply
voltage, check parameter 2102 Encoder supply, check parameter 2108 Encoder signal Vpp.
Cause: voltage level not correct or disturbance on signals of absolute SinCos channels.
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