Siemens 6RA70 specifications Fault Description

Fault

No.

Description
Cause as a function of fault value	Further information (r047.002 to r047.016)
(r047.001, r949.001 or r949.009 with acknowledged error)

12The drive has reached the positive torque limit even though the applied field current setpoint is still ≥ 50% of P102 (IF,motor)

Possible cause:

•Armature current is very “unsteady”, e.g. due to high speed controller P gain setting in P225 (on drive with high integral- action time). In this case, setting a lower actual speed filtering value in P200 and execution of another speed controller optimization run (P051=26) may help.

•Check torque limits

13The drive has reached the positive armature current limit even through the applied field current setpoint is still ≥ 50% of P102 (IF,motor)

Possible cause:

•Armature current is very “unsteady”, e.g. due to high speed controller P gain setting in P225 (on drive with high integral- action time). In this case, setting a lower actual speed filtering value in P200 and execution of another speed controller optimization run (P051=26) may help

•Check armature current limits

14The speed has changed by more than 12.5% at a constant speed setpoint even through the applied field current setpoint is still ≥ 50% of P102 (IF,motor)

Possible cause: as for fault value 12

15The EMF setpoint is too small to plot a field characteristic

EMFset = UA – IA,motor * RA = P101 – P100 * P110 < 10% of 1.35 * P078.i001 (e.g. P078.i001 = 400 V . . . minimum EMFset = 54 V)

16Field weakening operation is not allowed in operation without a tachometer (P083=3)

17The field current controller cannot be optimized because the field circuit time constant cannot be determined (actual field current does not decay after switch-off to below 0.95*initial value within approximately 1s or to below 0.8 * 0.95*initial values within approximately 2 s)

Possible cause:

•Setting in P103 is too high

•Field circuit inductance is too high

•Fault in actual field current sensing circuit (gating board or A7001 electronics board defective)

•Ratio r073.02 / P102 is too high (change P076.02 if necessary)

18Field weakening range is too wide, i.e. during power-up (at full field) to a speed setpoint of +10% nmax , the EMK is > 77% of setpoint EMF (P101 – P100 * P110)

Possible cause:

•Maximum speed setting is incorrect

•Pulse encoder parameters are incorrect (P140 to P143)

•Parameters for tachometer adaptation are incorrect (P741)

•Setpoint EMF is not correct (P101, P100, P110)

•An excessively high load torque (in positive or negative direction, e.g. a suspended load) causes the drive to rotate, one of the armature current or torque limits may be parameterized too low

19A steady-state actual speed of +10%, +20%, +30% . . . or +100% of the maximum speed cannot be reached within 3 minutes (or maximum value of the three set acceleration times) in speed-controlled operation (the speed setpoint/actual value difference averaged over 90 firing cycles must equal <0.1% nmax for a specific time period)

Possible cause:

•Acceleration time is set too low (P303, P307, P311)

•Drive is blocked

•An excessively high load torque (in positive or negative direction, e.g. a suspended load) causes the drive to rotate, one of the armature current or torque limits may be parameterized too low

•Poor speed controller setting (P225, P226, P228) or speed controller is parameterized as pure P controller or with droop

•A band elimination filter (P201, P202 or P203, P204) is active

•Command “Ramp-function generator enable” =0 or ”Ramp-function generator STOP” =1 is applied

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