Cause : Tachometer fault (active in operating states of – –, I, II)

If the check result is incorrect for 4 times in succession, the fault message is activated.

The monitoring function is effective only if the armature current is > 2% of the converter rated DC current set in r072.002.

Possible fault causes
♦ Open circuit in tachometer or pulse encoder cable.
♦ Tachometer of pulse encoder cable incorrectly connected.
♦ Pulse encoder supply has failed.
♦ Polarity for actual speed value (P743) is incorrectly set.
♦ Armature circuit data (P110 und P111) are incorrectly set (execute current controller optimization run).
♦ Tachometer or pulse encoder defective
♦ Pulse encoder supply voltage is incorrectly set (P140)
♦ The field polarity is not reversed by the external hardware when the field is reversed.

Open circuit in tachometer or pulse encoder cable -

- i002 Actual speed value (K0179) in case of fault
- i003 Actual EMF value (K0287) in case of fault

2 Polarity of tachometer or pulse encoder is incorrect

- i002 Actual speed value (K0179) in case of fault
- i003 Actual EMF value (K0287) in case of fault