9-12 Siemens Energy & Automation
SIMOREG DC Master Base Drive Panel Operating Instructions
Fault Description
No.
Cause as a function of fault value
(r047.001, r949.001 or r949.009 with acknowledged error)
Further information (r047.002 to r047.016)
F042 Tachometer fault
(active in operating states of – –, I, II)
A check is performed every 20ms to ensure that
(K0287) EMF Actual
(K0179) speedActual
is > +5%
If the check result is incorrect for 4 times in succession, the fault message is activated.
The following rule applies:
100% actual speed = maximum speed
100% actual EMF = ideal average DC voltage at
α ≥ 0, i.e. when the thyristor bridge is fully gated
The ideal DC voltage average value at
α = 0 is
π
23
P078.001
∗
∗
The monitoring function is effective only if the EMF > a % of
π
23
P078.001
∗
∗
"a" is a percentage that can be set in parameter P357 (default setting 10%).
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.
Fault value: r047 Index 002 to 016:
1 Open circuit in tachometer or pulse encoder cable i002 Actual speed value (K0179) in case of fault
2 Polarity of tachometer or pulse encoder is incorrect i003 Actual EMF value (K0287) in case of fault
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